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1014 POACEAE/PASPALUM Abundant weed in disturbed sites, lawns, and roadsides; throughout TX; widespread in s 1/2 of the U.S., also OR. May–Nov. Native of South America (Brazil and Argentina). This species is reported to be commercially important as a forage crop in the tropics (Yatskievych 1999), but it is sometimes a troublesome weed (Clayton & Renvoize 1986). Ergot alkaloids can be present—see generic synopsis. While almost all grasses are wind-pollinated, this grass is unusual in sometimes being pollinated at least partially by halictid bees (Adams et al. 1981). � I Paspalum dissectum (L.) L., (dissected, deeply cut), MUDBANK PASPALUM, MUDBANK CROWN GRASS. Mat- or clump-forming perennial without conspicuous rhizomes; culms 15–60 cm long; leaf sheaths glabrous; ligule 1.5–2.5 mm long; inflorescence branches 2–6, 1–3(–5.3) cm long, the branch axes broadly winged, sometimes almost leaf-like, as wide or wider than the rows of spikelets, the wing margins sometimes even slightly wrapping around the spikelets; spikelets solitary (with neither aborted spikelet nor pedicel present immediately beside or below fertile spikelet), in 2 rows, 1.7–2.1(–2.3) mm long; lower glume absent; upper glume minutely pubescent; lemma of sterile floret glabrous. Lake shores, ditches, sandy soils; Leon (BRIT), Harris (SBSC), Guadalupe, Montgomery (Morrone et al. 1996), Angelina, Bastrop, Caldwell, Gonzales, and Nacogdoches (Turner et al. 2003) cos.; also Gulf Prairies and Marshes; e U.S. from NJ s to FL w to KS and TX. Jul–Nov. [Panicum dissectum L.] This species can have cleistogamous spikelets with very small anthers (ca. 0.3 mm long); such spikelets do not open to expose the anthers and stigmas and are thus self-pollinated (Morrone et al. 1996). Paspalum distichum L., (two-spiked), KNOT GRASS, ETERNITY GRASS, JOINT GRASS, FORT THOMPSON GRASS, JOINTED CROWN GRASS, THOMPSON GRASS. Perennial 10–65 cm tall, with trailing and rooting culms (stolons) sometimes several meters long; leaf sheaths usually glabrous or pilose; ligule 0.6–2 mm long; inflorescence branches 2, occasionally 3–4, these usually paired or one slightly below other, 1–5(–7) cm long, the branch axes only slightly winged; spikelets 2.4–3(–3.2) mm long, mostly solitary, usually in 2 rows; lower glume often present, reduced; upper glume usually minutely pubescent; lemma of sterile floret glabrous. Moist or wet areas along ponds, lakes, streams, and ditches; throughout TX; s 1/2 of the U.S., also NJ, OR, and WA. Jun–Oct. [Digitaria paspaloides Michx., P. distichum var. indutum Shinners, P. paspaloides (Michx.) Scribn.] While some authorities (e.g., Jones et al. 1997) recognize var. indutum (known only from Dallas Co.—Gould 1975b) with leaf sheaths pubescent, we are following Allred (1982), Allen (1992b), Kartesz (1999), and Allen and Hall (2003) in not recognizing infraspecific taxa. Larry Brown (pers. comm.) notes that the upper glume can be pubescent on some spikelets but glabrous on others (on the same plant) and that likewise the first glume can be either present or absent—these conditions suggest that the species should perhaps be merged with P. vaginatum. Paspalum floridanum Michx., (of Florida), FLORIDA PASPALUM, BIG FLORIDA PASPALUM, BIG PASPALUM, FLORIDA CROWN GRASS. Rhizomatous perennial; culms erect, usually 1–2.1 m tall; leaf sheaths and blades nearly or completely glabrous or � densely hirsute; ligule 1–3.3 mm long; inflorescence branches usually 2–5(–8), 3–13(–17) cm long, the branch axes � unwinged; spikelets usually 3.6–4.8 mm long, mostly paired, in 4 rows, glabrous; lower glume absent. Grasslands and open woodlands; widespread in e 1/3 of TX; e U.S. from NJ s to FL w to KS and TX. Aug–Nov. [Paspalum floridanum var. glabratum Engelm. ex Vasey] Some authorities (e.g., Jones et al. 1997; Yatskievych 1999; Hatch 2002) recognize var. glabratum, based on � glabrous leaf sheaths and blades (versus with pubescence). However, we are following Allen and Hall (2003) in not recognizing infraspecific taxa. Paspalum hartwegianum E. Fourn., (for Theodore Hartweg, 1812–1871, Royal Horticultural Society collector in CA and Mexico), HARTWEG’S PASPALUM, HARTWEG’S CROWN GRASS. Tufted perennial similar to P. pubiflorum; inflorescence branches (3–)4–8, 3–7 cm long, the branch axes winged; spikelets (2.2–)2.5–2.9(–3.2) mm long, typically paired, usually in 4 rows on the branch axis; lower glume absent; upper glume and lemma of sterile floret pubescent. Ditches, low areas;
ILLUSTRATED FLORA OF EAST TEXAS 1015 Panicum trichoides Panicum verrucosum Panicum virgatum Pappophorum bicolor Paspalidium geminatum Paspalum almum Paspalum bifidum Paspalum boscianum Paspalum conjugatum Paspalum convexum Paspalum dilatatum Paspalum dissectum
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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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POACEAE 801 6. Lemmas awned, the tw
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POACEAE 803 30. Lemma veins none to
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POACEAE 805 13. Inflorescences narr
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POACEAE 807 12. Lemma awnless; infl
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POACEAE 809 inflorescence solitary,
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POACEAE 811 29. Spikelets loosely a
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POACEAE 813 20. Basal leaves usuall
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AEGILOPS/POACEAE 815 23. Spikelets
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AGROSTIS/POACEAE 817 Agrostis hyema
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ANDROPOGON/POACEAE 821 colonizing e
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ANTHENANTIA/POACEAE 825 to be the e
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ARISTIDA/POACEAE 829 9. Lemma thick
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ARISTIDA/POACEAE 831 BRIT), Newton
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Anthoxanthum aristatum [BB2] Anthox
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AXONOPUS/POACEAE 839 duced to the U
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Avena fatua [HI1] Arundo donax [LYN
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BOTHRIOCHLOA/POACEAE 843 var. barbi
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Aristida purpurea (all vars.) ILLUS
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Axonopus compressus [HI1] Axonopus
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BOUTELOUA/POACEAE 849 state grass b
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Bothriochloa ischaemum var. songari
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Bouteloua pectinata [BOT, HEA] Bout
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BROMUS/POACEAE 857 8. Lemmas and gl
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BUCHLOE/POACEAE 861 ticularly in th
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CHASMANTHIUM/POACEAE 865 [C. caroli
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CHLORIS/POACEAE 871 East TX; mainly
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Chasmanthium sessiliflorum [USB] Ch
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CORTADERIA/POACEAE 875 of the inflo
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DANTHONIA/POACEAE 881 Dactylocteniu
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Cynodon dactylon [REE] Cynosurus ec
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DICHANTHELIUM/POACEAE 885 AA genus
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DICHANTHELIUM/POACEAE 887 20. Inter
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DICHANTHELIUM/POACEAE 889 26. Leaf
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Danthonia spicata [USB] Desmazeria
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DICHANTHELIUM/POACEAE 897 and Harri
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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
Page 655 and 656: KOELERIA/POACEAE 963 Andropogoneae,
Page 657 and 658: Heteropogon melanocarpus [HI1] Hord
Page 659 and 660: LEPTOCHLOA/POACEAE 967 Leersia oryz
Page 661 and 662: ILLUSTRATED FLORA OF EAST TEXAS Koe
Page 663 and 664: ILLUSTRATED FLORA OF EAST TEXAS Hor
Page 665 and 666: LOLIUM/POACEAE 973 Charmet et al. 1
Page 667 and 668: Leptochloa nealleyi [USB] Lolium ri
Page 669 and 670: MICROSTEGIUM/POACEAE 977 AA variabl
Page 671 and 672: ILLUSTRATED FLORA OF EAST TEXAS Lep
Page 673 and 674: Lolium temulentum [USB] Melica muti
Page 675 and 676: MUHLENBERGIA/POACEAE 983 10. Lemma
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Page 689 and 690: Oryza sativa [HI1] Panicum anceps [
Page 691 and 692: ILLUSTRATED FLORA OF EAST TEXAS Muh
Page 693 and 694: PANICUM/POACEAE 1001 Panicum hallii
Page 695 and 696: ILLUSTRATED FLORA OF EAST TEXAS 100
Page 699 and 700: Panicum trichoides [HI2] ILLUSTRATE
Page 701 and 702: PASPALUM/POACEAE 1009 5. Spikelets
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Page 705: Panicum virgatum [RCA] Paspalum acu
Page 711 and 712: PASPALUM/POACEAE 1019 loam soils; w
Page 717 and 718: PENNISETUM/POACEAE 1025 unit as in
Page 719 and 720: Paspalum repens [USB] ILLUSTRATED F
Page 721 and 722: 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 737 and 738: SACCHARUM/POACEAE 1045 1. Awn of le
Page 739 and 740: SCHEDONNARDUS/POACEAE 1047 lower gl
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 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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