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852 POACEAE/BRACHYELYTRUM (e.g., Stephenson ined.) treating all three taxa as parts of a single species and others considering them worthy of recognition as separate species (Stephenson 1971; Tucker 1988; Kartesz 1999). We are following a recent revision of the genus (Saarela et al. 2003), based on morphological and molecular data, in recognizing the variation at the specific level. The disjunct e Asia–e North America distribution pattern exhibited by this and other genera has complex origins and is of interest to plant geographers. In the geologic past, dispersal between the Eurasian and North American continents was possible across both the Bering and North Atlantic land bridges, and the combined area is considered a single “Holarctic” biogeographic region. The fossil record shows that many plants had extensive distributions across the Northern Hemisphere—for example, temperate forests with tropical elements occurred very broadly and reached their maximum extension in the mid-Tertiary (the Tertiary extended from 65 million years ago to 1.8 mya). This widespread flora has been referred to as the Arcto-Tertiary flora, the Tertiaro-mesophytic flora, the boreotropical flora, or a mixed mesophytic forest. Geohistorical events from the mid-Tertiary to the present have included alterations in the shapes of the northern land masses, fluctuations in sea levels, plate tectonic movements, mountain building, glaciation, and other changes in the climate. As a result, there have been great changes in both the composition and the disposition of the flora, and the ranges of many plants have been greatly restricted (e.g., eliminated from Europe and w North America). A significant number of plants that were once much more widespread now survive in only two areas, e North America and e Asia. Though this disjunct distribution pattern has complex and multiple origins, with similar present day distributions differing in time and manner of origin, the consensus is that the e Asia–e North America pattern is in general a relict of the maximum development of Northern Hemisphere temperate forests (with tropical elements) in the Tertiary, with greater survival in e Asia and e North America and higher rates of extinction in Europe and w North America. According to Wen (1999), ca. 65 genera of seed plants have this disjunct distribution. The genus Brachyelytrum is an example (other East TX examples include, but are not limited to, Aletris, Ampelopsis, Apios, Campsis, Carya, Diarrhena, Halesia, Hamamelis, Lindera, Ly onia, Menispermum, Nyssa, Parthenocissus, Penthorum, Phryma, Podophyllum, Sassafras, Saururus, Stewartia, Tipularia, Trachelospermum, Triosteum, and Zizania) (Li 1952; Little 1970; Graham 1972; Boufford & Spongberg 1983; Hamilton 1983; Hsü 1983; Wu 1983; Ying 1983; Tiffney 1985a, 1985b; Cox & Moore 1993; Graham 1993a, 1999; Xiang et al. 1998; Wen 1999, 2001; Dilcher 2000; Donoghue et al. 2001; Xiang & Soltis 2001). This genus has been variously thought to be in either the Pooideae (Festucoideae) (e.g., Hitchcock 1951) or Bambusoideae (e.g., Campbell et al. 1986; Tucker 1988), but recent evidence confirms its place in the Pooideae (Grass Phylogeny Working Group 2001). (Greek: brachys, short, and elytron, cover, husk, sheath, presumably in reference to the small glumes) (subfamily Pooideae, tribe Brachyelytreae) REFERENCES: Babel 1943; Koyama & Kawano 1964; Stephenson 1971, ined.; Macfarlane & Watson 1980; Nixon et al. 1980a; Campbell 1983b; Campbell et al. 1986; Tucker 1988; Saarela et al. 2003. Brachyelytrum erectum (Schreb.) P. Beauv., (upright), BEARDED SHORT HUSK, LONG-AWNED WOOD GRASS. Perennial with short knotty rhizomes; culms 50–90(–100) cm tall, erect to ascending, usually with retrorse pubescence near the nodes; leaves cauline, 2–6; ligule a scale 1–3.5 mm long; leaf blades 8–17.5 cm long, 5–20 mm wide, flat; inflorescence a narrow panicle, often appearing racemose, 7–17 cm long; spikelets 8–13 mm long (excluding awns), with 1 fertile floret, disarticulating above the glumes; lower (first) glume absent or rudimentary (� 1 mm long); upper glume 1–4(–8) mm long; lemma 8–13 mm long, strongly antrorsely hispid, tapering into an awn 12–25(–30) mm long; palea slightly shorter than lemma; rachilla prolonged beyond palea as a slender awn-like bristle 5–8 mm long; stamens 3, the anthers ca. 5–6 mm long. Mesic forests, beech-hardwood slopes; Nacogdoches, Sabine (BRIT), San Augustine, Shelby (TOES 1993), Polk, Rusk, Tyler (Turner et al. 2003), and Jasper (J. Singhurst, pers. comm.) cos. in the Pineywoods; se Canada and e U.S. from ME s to FL w to MN and TX. May–Sep. This species was first reported for TX from Nacogdoches Co. by Nixon et al. (1980a). Vegetatively and in habitat preference, it superficially resembles two other woodland species, Bromus pubescens and Chasmanthium latifolium; however, Brachyelytrum can be easily distinguished by its spikelets with only 1 floret (versus 4–many florets). (TOES 1993: IV) �
ILLUSTRATED FLORA OF EAST TEXAS 853 Bothriochloa exaristata Bothriochloa hybrida Bothriochloa ischaemum (both vars.) Bothriochloa laguroides subsp. torreyana Bothriochloa longipaniculata Bouteloua aristidoides Bouteloua barbata Bouteloua curtipendula (both vars.) Bouteloua eriopoda Bouteloua gracilis Bouteloua hirsuta Bouteloua pectinata
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KEYS TO THE VASCULAR PLANTS 309 KEY
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KEY TO FERNS AND SIMILAR PLANTS 311
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Key to Families of Gymnosperms KEY
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20. Flowers in a single, small (4-4
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38. Stamens 6 per flower. 39. Peria
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57. Leaves reduced to scales only;
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FERNS AND SIMILAR PLANTS (PTERIDOPH
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ISOETES/ISOETACEAE 323 DIVISION LYC
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Psilotum nudum [KNO] Isoetes butler
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LYCOPODIELLA/LYCOPODIACEAE 327 Beit
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SELAGINELLA/SELAGINELLACEAE 329 Pse
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ILLUSTRATED FLORA OF EAST TEXAS 331
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Palhinhaea cernua [CLU] Selaginella
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leaf blade petiole rhizome root sca
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ASPLENIUM L. SPLEENWORT ASPLENIUM/A
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WOODWARDIA/BLECHNACEAE 339 1. Plant
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MEGASPORE Woodwardia areolata [LUN]
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DRYOPTERIDACEAE 343 AThe family as
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Anemia mexicana Azolla caroliniana
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DRYOPTERIS/DRYOPTERIDACEAE 347 Carr
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WOODSIA/DRYOPTERIDACEAE 351 Tectari
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MARSILEA/MARSILEACEAE 353 etation (
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BOTRYCHIUM/OPHIOGLOSSACEAE 357 REFE
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Nephrolepis exaltata Onoclea sensib
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OPHIOGLOSSUM/OPHIOGLOSSACEAE 361 Op
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PTERIDACEAE 365 and pous or podium,
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Botrychium virginianum Ophioglossum
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CERATOPTERIS/PTERIDACEAE 371 Astrol
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Argyrochosma dealbata [LUN] Astrole
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Cheilanthes feei [LUN] Cheilanthes
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Astrolepis integerrima Astrolepis s
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SALVINIACEAE 379 fern, derived from
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SALVINIA/SALVINIACEAE 381 NM, and N
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Pellaea ovata Pellaea wrightiana IL
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Thelypteris dentata [SM3] STERILE F
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GYMNOSPERMS EPHEDRACEAE 389 AThe te
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DIVISION PINOPHYTA CONIFERS CUPRESS
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JUNIPERUS/CUPRESSACEAE 393 allergen
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Ephedra antisyphilitica [LUN] Junip
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PINUS/PINACEAE 397 clusters at the
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� � � � � � Pinus echin
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Ephedra antisyphilitica Juniperus a
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MAGNOLIOPHYTA 403 consumed in large
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CLASS MONOCOTYLEDONAE MONOCOTYLEDON
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AGAVACEAE 407 produced in North Ame
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HESPERALOE/AGAVACEAE 409 for their
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Acorus calamus [GLE] Hesperaloe eng
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YUCCA/AGAVACEAE 413 snakebite (Verh
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7. Leaves straight or nearly so, la
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Manfreda virginica subsp. lata [HEA
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Manfreda maculosa Manfreda sileri I
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ALISMA/ALISMATACEAE 423 1. Pistils
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Yucca rupicola [LYN] Yucca treculea
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SAGITTARIA/ALISMATACEAE 427 long te
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Echinodorus tenellus [FLN, RHO] Sag
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Yucca treculeana ILLUSTRATED FLORA
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ALLIUM/ALLIACEAE 433 pounds are ant
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ALLIUM/ALLIACEAE 435 Allium ampelop
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STAMENS ILLUSTRATED FLORA OF EAST T
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CAPSULE Allium canadense var. mobil
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var. fraseri-▲ var. hyacinthoides
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AMARYLLIDACEAE 443 and edible (Baye
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COOPERIA/AMARYLLIDACEAE 445 REFEREN
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BULBILS CAPSULE Allium sativum [ANO
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HABRANTHUS/AMARYLLIDACEAE 449 obser
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CAPSULES SEED Habranthus tubispathu
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LYCORIS/AMARYLLIDACEAE 455 usually
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Hymenocallis liriosme [HEA] Leucoju
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Narcissus jonquilla [NIC] Narcissus
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ANTHERICACEAE 461 2000), Anderson,
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ARACEAE 463 hemiepiphytes, and aqua
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ARISAEMA/ARACEAE 465 has been disag
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ORONTIUM/ARACEAE 469 down the insid
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Echeandia flavescens [MCV] Colocasi
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ARECACEAE 473 oped rhizomes present
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ASPARAGACEAE 475 spreading from cul
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BROMELIACEAE 477 jointed pedicels;
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Xanthosoma sagittifolium [BA1] Saba
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APTERIA/BURMANNIACEAE 481 FAMILY RE
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S. minor � S. mexicana-� ILLUST
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UVULARIA/COLCHICACEAE 485 blurred,
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ANTHER CAPSULE PISTIL Apteria aphyl
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CALLISIA/COMMELINACEAE 489 the Haem
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COMMELINA/COMMELINACEAE 491 4. Spat
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SINGLE FLOWER INFLORESCENCE Callisi
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TRADESCANTIA/COMMELINACEAE 495 & Tv
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FRUITING INFLORESCENCE Murdannia nu
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Tradescantia paludosa [AND] Tradesc
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CYPERACEAE 507 become split by grow
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CYPERACEAE 509 10. Scales of spikel
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BULBOSTYLIS/CYPERACEAE 511 1. Spike
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CAREX/CYPERACEAE 517 The following
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CAREX/CYPERACEAE 519 of leaf sheath
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CAREX/CYPERACEAE 521 37. Perigynia
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CAREX/CYPERACEAE 523 58. Achene sho
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CAREX/CYPERACEAE 525 85. Larger per
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Carex abscondita [MAC] Carex albica
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CAREX/CYPERACEAE 531 persists in li
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Carex decomposita [MAC] Carex digit
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Carex triangularis [MAC] Carex tetr
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CYPERUS/CYPERACEAE 559 1974; Baijan
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CYPERUS/CYPERACEAE 561 21. Leaf bla
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CYPERUS/CYPERACEAE 563 fresh; achen
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CYPERUS/CYPERACEAE 565 tively more
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CYPERUS/CYPERACEAE 573 Cyperus invo
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Cyperus esculentus [REE] Cyperus fi
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CYPERUS/CYPERACEAE 577 around the s
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Cyperus iria [GWO] Cyperus lanceola
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Cyperus surinamensis [BT2] Cyperus
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ELEOCHARIS/CYPERACEAE 587 5. Culms
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ELEOCHARIS/CYPERACEAE 589 27. Spike
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ELEOCHARIS/CYPERACEAE 591 43. Scale
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ELEOCHARIS/CYPERACEAE 593 compressa
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ELEOCHARIS/CYPERACEAE 601 ing mats;
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FIMBRISTYLIS Vahl FIMBRY FIMBRISTYL
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Fimbristylis annua [SID] Fimbristyl
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REFERENCES: Coville 1890; Bush 1905
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RHYNCHOSPORA/CYPERACEAE 621 Lipocar
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RHYNCHOSPORA/CYPERACEAE 623 10. Per
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RHYNCHOSPORA/CYPERACEAE 625 34. Cul
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Lipocarpha aristulata [GWO] Lipocar
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SCHOENOPLECTUS/CYPERACEAE 641 exten
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Schoenoplectus pungens [MAS] Schoen
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SCLERIA/CYPERACEAE 649 5. Lowest la
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SCLERIA/CYPERACEAE 651 with a pair
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ERIOCAULON/ERIOCAULACEAE 657 1. Pet
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ERIOCAULON/ERIOCAULACEAE 659 bracts
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� Dioscorea bulbifera [HEB] ILLUS
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HYACINTHACEAE 663 orange zone towar
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Scleria pauciflora ILLUSTRATED FLOR
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� � ILLUSTRATED FLORA OF EAST T
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SCHOENOLIRION/HYACINTHACEAE 669 som
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HYDROCHARITACEAE 671 AA small (116
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HYDRILLIA/HYDROCHARITACEAE 673 marg
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OTTELIA Pers. DUCK-LETTUCE OTTELIA/
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� Vallisneria americana [LAM] Ott
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IRIDACEAE 683 inflorescences with 1
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BELAMCANDA Adans. LEOPARD-LILY, BLA
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IRIS/IRIDACEAE 691 6. Cauline leaf
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Iris brevicaulis [YAT] ILLUSTRATED
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SISYRINCHIUM/IRIDACEAE 697 3. Inflo
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Sisyrinchium ensigerum [CUR] Sisyri
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JUNCUS/JUNCACEAE 703 mainly in wet
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JUNCUS/JUNCACEAE 705 yellowish, lea
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Juncus acuminatus [MAS] Juncus anth
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Juncus dichotomus [GWO] Juncus effu
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Juncus polycephalus [GWO] Juncus re
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var. validus-● var. facinatus-�
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LEMNA/LEMNACEAE 721 Pineywoods and
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SPIRODELA/LEMNACEAE 723 Lemna turio
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NOTE 3 VEINS � TOP VIEW Lemna min
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LILIACEAE 729 The lily family (even
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ERYTHRONIUM/LILIACEAE 731 17. Tepal
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Wolffia columbiana [GWO, MIB] Wolff
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LIMNOCHARITACEAE 735 1. Perianth wh
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THALIA/MARANTACEAE 737 pollen prese
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MELANTHIACEAE 739 AA small family (
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Lilium philippinense [GCH] SEED FOL
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VERATRUM/MELANTHIACEAE 745 circumsc
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Zigadenus glaberrimus [GLE] Schoeno
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ALETRIS/NARTHECIACEAE 749 Tofieldia
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DASYLIRION Zucc. SOTOL, SHAGGY-LILY
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FLOWER Aletris aurea [CO1] Aletris
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ORCHIDACEAE 755 45 occur in East TX
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CALOPOGON/ORCHIDACEAE 757 5-25 flow
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CLEISTES/ORCHIDACEAE 759 long; lip
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CYPRIPEDIUM/ORCHIDACEAE 761 while t
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Stenanthium gramineum Toxicoscordio
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Calopogon tuberosus [FNA] Corallorh
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HEXALECTRIS/ORCHIDACEAE 767 rain. A
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Habenaria quinqueseta [LUN] Habenar
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PLATANTHERA/ORCHIDACEAE 771 PLATANT
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PLATANTHERA/ORCHIDACEAE 773 Platant
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SPIRANTHES/ORCHIDACEAE 779 mm wide,
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SPIRANTHES/ORCHIDACEAE 781 12. Lip
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Platanthera lacera [YAT] Pogonia op
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SPIRANTHES/ORCHIDACEAE 789 narrowes
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TRIPHORA/ORCHIDACEAE 791 an example
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LEAF collar rhizome blade ligule sh
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POACEAE 797 Dissection is usually n
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POACEAE 799 rower and often differe
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Page 495 and 496: POACEAE 803 30. Lemma veins none to
Page 497 and 498: POACEAE 805 13. Inflorescences narr
Page 499 and 500: POACEAE 807 12. Lemma awnless; infl
Page 501 and 502: POACEAE 809 inflorescence solitary,
Page 503 and 504: POACEAE 811 29. Spikelets loosely a
Page 505 and 506: POACEAE 813 20. Basal leaves usuall
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Page 509 and 510: AGROSTIS/POACEAE 817 Agrostis hyema
Page 511 and 512: ILLUSTRATED FLORA OF EAST TEXAS 819
Page 513 and 514: ANDROPOGON/POACEAE 821 colonizing e
Page 517 and 518: ANTHENANTIA/POACEAE 825 to be the e
Page 521 and 522: ARISTIDA/POACEAE 829 9. Lemma thick
Page 523 and 524: ARISTIDA/POACEAE 831 BRIT), Newton
Page 527 and 528: Anthoxanthum aristatum [BB2] Anthox
Page 531 and 532: AXONOPUS/POACEAE 839 duced to the U
Page 533 and 534: Avena fatua [HI1] Arundo donax [LYN
Page 535 and 536: BOTHRIOCHLOA/POACEAE 843 var. barbi
Page 537 and 538: Aristida purpurea (all vars.) ILLUS
Page 539 and 540: Axonopus compressus [HI1] Axonopus
Page 541 and 542: BOUTELOUA/POACEAE 849 state grass b
Page 543: Bothriochloa ischaemum var. songari
Page 547 and 548: Bouteloua pectinata [BOT, HEA] Bout
Page 549 and 550: BROMUS/POACEAE 857 8. Lemmas and gl
Page 553 and 554: BUCHLOE/POACEAE 861 ticularly in th
Page 557 and 558: CHASMANTHIUM/POACEAE 865 [C. caroli
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Page 565 and 566: Chasmanthium sessiliflorum [USB] Ch
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Page 573 and 574: DANTHONIA/POACEAE 881 Dactylocteniu
Page 575 and 576: Cynodon dactylon [REE] Cynosurus ec
Page 577 and 578: DICHANTHELIUM/POACEAE 885 AA genus
Page 579 and 580: DICHANTHELIUM/POACEAE 887 20. Inter
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Page 583 and 584: Danthonia spicata [USB] Desmazeria
Page 589 and 590: DICHANTHELIUM/POACEAE 897 and Harri
Page 591 and 592: Dichanthelium acuminatum (all vars.
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DICHANTHELIUM/POACEAE 905 that this
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DIGITARIA/POACEAE 909 2. Main axis
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Dichanthelium sphaerocarpon [HI] IL
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DIGITARIA/POACEAE 913 with papilla-
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Digitaria bicornis [HEB] ILLUSTRATE
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Digitaria insularis [HI1] Digitaria
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EHRHARTA/POACEAE 921 spikelets (2.5
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ELIONURUS/POACEAE 923 Since this co
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Echinochloa crus-gali [REE] Echinoc
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ENTEROPOGON Nees UMBRELLA GRASS ENT
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ERAGROSTIS/POACEAE 931 8. Infloresc
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ERAGROSTIS/POACEAE 933 12. Pedicels
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Elymus repens [HI1] Elymus smithii
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Eragrostis japonica [USB] ILLUSTRAT
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ERIONEURON/POACEAE 945 Shaw and Sme
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� � � ILLUSTRATED FLORA OF EA
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FESTUCA/POACEAE 951 rachilla glabro
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GYMNOPOGON/POACEAE 955 Glyceria sep
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HILARIA/POACEAE 957 REFERENCES: Eme
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ILLUSTRATED FLORA OF EAST TEXAS Fes
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KOELERIA/POACEAE 963 Andropogoneae,
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Heteropogon melanocarpus [HI1] Hord
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LEPTOCHLOA/POACEAE 967 Leersia oryz
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ILLUSTRATED FLORA OF EAST TEXAS Koe
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ILLUSTRATED FLORA OF EAST TEXAS Hor
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LOLIUM/POACEAE 973 Charmet et al. 1
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Leptochloa nealleyi [USB] Lolium ri
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MICROSTEGIUM/POACEAE 977 AA variabl
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ILLUSTRATED FLORA OF EAST TEXAS Lep
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Lolium temulentum [USB] Melica muti
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MUHLENBERGIA/POACEAE 983 10. Lemma
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MUHLENBERGIA/POACEAE 985 and Prairi
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ILLUSTRATED FLORA OF EAST TEXAS Mon
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ILLUSTRATED FLORA OF EAST TEXAS Mic
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ILLUSTRATED FLORA OF EAST TEXAS Muh
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PANICUM/POACEAE 993 fact that gener
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PANICUM/POACEAE 995 17. Spikelets 2
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Oryza sativa [HI1] Panicum anceps [
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ILLUSTRATED FLORA OF EAST TEXAS Muh
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PANICUM/POACEAE 1001 Panicum hallii
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Panicum trichoides [HI2] ILLUSTRATE
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PASPALUM/POACEAE 1009 5. Spikelets
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PASPALUM/POACEAE 1011 27. Axils of
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Panicum virgatum [RCA] Paspalum acu
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PASPALUM/POACEAE 1019 loam soils; w
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PENNISETUM/POACEAE 1025 unit as in
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Paspalum repens [USB] ILLUSTRATED F
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PHALARIS/POACEAE 1029 landscapes (B
Page 723 and 724:
Paspalum pubiflorum (both vars.) IL
Page 725 and 726:
Pennisetum purpureum [HUT] Penniset
Page 727 and 728:
POA/POACEAE 1035 around awn base; l
Page 729 and 730:
POA/POACEAE 1037 long. Forests, flo
Page 731 and 732:
Page 733 and 734:
Page 735 and 736:
Page 737 and 738:
SACCHARUM/POACEAE 1045 1. Awn of le
Page 739 and 740:
SCHEDONNARDUS/POACEAE 1047 lower gl
Page 741 and 742:
Page 743 and 744:
Page 745 and 746:
SETARIA/POACEAE 1053 Paspalidium (W
Page 747 and 748:
SETARIA/POACEAE 1055 14. Leaf blade
Page 749 and 750:
Schizachyrium tenerum [HI1, USB] Sc
Page 751 and 752:
Page 753 and 754:
Page 755 and 756:
SORGHUM/POACEAE 1063 2000) indicate
Page 757 and 758:
SPARTINA/POACEAE 1065 Americas it [
Page 759 and 760:
Sorghastrum elliottii [HI1] Sorghas
Page 761 and 762:
Page 763 and 764:
SPOROBOLUS/POACEAE 1071 7. Lemma ap
Page 765 and 766:
Page 767 and 768:
STEINCHISMA/POACEAE 1075 Sporobolus
Page 769 and 770:
Sphenopholis obtusata (both vars.)
Page 771 and 772:
Sporobolus neglectus [HI1] Sporobol
Page 773 and 774:
TRICHONEURA/POACEAE 1081 guish it f
Page 775 and 776:
Stenotaphrum secundatum [USB] Trich
Page 777 and 778:
Page 779 and 780:
Page 781 and 782:
TRISETUM/POACEAE 1089 low areas; ne
Page 783 and 784:
UROCHLOA/POACEAE 1091 AA C4 genus o
Page 785 and 786:
Page 787 and 788:
Tridens eragrostoides Tridens flavu
Page 789 and 790:
VULPIA/POACEAE 1097 2. Lemmas (exce
Page 791 and 792:
Page 793 and 794:
Page 795 and 796:
ZIZANIOPSIS/POACEAE 1103 (1999) (po
Page 797 and 798:
Page 799 and 800:
EICHHORNIA/PONTEDERIACEAE 1107 REFE
Page 801 and 802:
Zoysia japonica [HOL] Zoysia pacifi
Page 803 and 804:
POTAMOGETON/POTAMOGETONACEAE 1111 1
Page 805 and 806:
POTAMOGETON/POTAMOGETONACEAE 1113 P
Page 807 and 808:
Page 809 and 810:
Page 811 and 812:
SMILAX/SMILACACEAE 1119 times woody
Page 813 and 814:
SMILAX/SMILACACEAE 1121 30(-60) mm
Page 815 and 816:
Stuckenia pectinata [MAS] ILLUSTRAT
Page 817 and 818:
Page 819 and 820:
THEMIDACEAE 1127 cover for various
Page 821 and 822:
Smilax rotundifolia [JEM] ILLUSTRAT
Page 823 and 824:
TRILLIUM/TRILLIACEAE 1131 Schilling
Page 825 and 826:
TRILLIUM/TRILLIACEAE 1133 taxonomic
Page 827 and 828:
Triantha racemosa [GLE] Trillium lu
Page 829 and 830:
TYPHA/TYPHACEAE 1137 REFERENCES: Wi
Page 831 and 832:
XYRIS/XYRIDACEAE 1139 cone-like spi
Page 833 and 834:
XYRIS/XYRIDACEAE 1141 11. Plant bas
Page 835 and 836:
Sparganium americanum Typha latifol
Page 837 and 838:
Typha domingensis[ BT3] Typha latif
Page 839 and 840:
Xyris drummondii [SID] Xyris fimbri
Page 841 and 842:
Xyris smalliana [SID] ILLUSTRATED F
Page 843:
Xyris caroliniana Xyris difformis (
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keys to the vascular plants of east texas - Botanical Research ...

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