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36 FIELDIANA: BOTANY, VOLUME 28 exteriore brevi membranacea; ligula ex pilis longis implicatis, in ore vaginarum inferiorum conspicuis, constituta; laminae articulatae, inferiores suque ad 34 cm. longae, 5.5 cm. latae, acuminatae, tessellatae, glabrae, marginibus scaberrimis, eae ramorum minores, 6-14 cm. longae, 2-2.5 cm. latae; inflorescentiae 10-30 cm. longae, 1-1.5 cm. latae, densae, attenuatae, racemis brevibus, condensatis, appressis, axe dense pubescente; glumae floribus fere longiores, secunda quam prima longior, acuminatae, in parte superiore marginibus involutis; lemma sterile 3 mm. longum, obtusum, apiculatum; lemmata fertilia 3.5 mm. longa, obtusa, glabra; palea quam lemmate 0.5-1.0 mm. longior, inter carinas sulcata; flos supremus reductus obsoletus, rachilla manifesta. Perennial; culms woody, branching and rebranching, apparently from the lower nodes, the main culm as much as 3 m. tall, about 1 cm. thick; sheaths very crowded, distichous, the back thickened, becoming spongy and fibrous with age, glabrous, extending beyond the articulation with the blade as a short membrane; ligule a dense line of long tangled hairs, the lateral hairs conspicuous at mouth of the sheath; lower blades as much as 34 cm. long, 5.5 cm. wide, acuminate, rather broadly rounded at the base, tessellate, glabrous on both surfaces, the margins strongly scabrous, disarticulating from the sheath with age, the blades of the branches much smaller, 6-14 cm. long, 2-2.5 cm. wide; inflorescences terminal on all the branches, 10-30 cm. long, 1-1.5 cm. wide, dense, spikelike, attenuate toward the tip, the short crowded racemes closely appressed, the axis densely pubescent; spikelets 5-7 mm. long; glumes about equaling or exceeding the florets, the second longer than the first, broad at the base, acuminate, the margins inrolled from the middle upward, the tip thus appearing as a stout awn; sterile lemma 3 mm. long, obtuse, apiculate; fertile lemma 3.5 mm. long, obtuse, glabrous, the midnerve thickened toward the tip but not excurrent; palea 0.5-1.0 mm. longer than the lemma, deeply sulcate; upper rudimentary floret reduced to the rachilla joint. Type in U.S. Nat. Herb., nos. 1,914,812-4, collected on Cumbre del Cerro Acopan, Carom', Guayana, alt. 2150 m., October, 1947, Felix Cardona 2307.
BOTANICAL EXPLORATION IN VENEZUELA - I 37 Bulbostylis junciformis var. CYPERACEAE CYPEREAE Tribe ambigua (Nees) Steyermark, comb. nov. Isolepis ambigua Nees, in Herb. Lindl. et in Linn. IX: 291. 1834; Kunth, Enum. II: 219. 1837; Isolepis junciformis B Kunth, Enum. II. I.e. This variety is distinguished by its shorter leaves and culms, even shorter than in the following var. congesta, the culms "semipedali aut breviori", and in the simple terminal head of flowers. The leaves are noticeably more scabrid-ciliate on the margins than in any of the other varieties. Dry sandy upland, Gran Sabana, between waterfall at Rue-meru and Divina Pastora on Rio Kukenan north of- Santa Elena, south of Mount Roraima, state of Bolivar, alt. 1065 m., Steyermark 59207. Bulbostylis junciformis var. congesta (Schrad.) Steyermark, comb. nov. Scirpus congestus Reichenb. in Weigelt. Herb. Surinam; Isolepis congesta Schrad. in Schult. Mant. II: 70. 1822; Kunth, Enum. II: 218. 1837; Oncostylis junciformis 6 congesta Nees, in Mart. Fl. Bras. 21: 86. 1842. This variety may be distinguished by the shorter culms, the shorter leaves which are about hah* the length of the culm, and by the more contracted umbels on fewer and shorter rays. Gran Sabana, between Kun and Uaduara-paru^ in valley of Rib Kukena'n, south of Mount Roraima, state of Bolivar, alt. 1065-1220 m., Steyermark 59080. Bulbostylis Svensoniana Steyermark, sp. nov. Perennis; culmis caespitosis angulosis striatis glabris, 5-5.5 dm. altis, 1.25-1.5 mm. latis, basi foliatis; foliis filiformi-setaceis erectis vel curvatis, supra glabris vel glabratis, infra pilosis, 10-25 cm. longis, 0.5 mm. latis, culmo brevioribus; vaginis ore dorsoque sericeo-lanatis; involucre 5-6-phyllo setaceo scabridulo, 2.5-5 cm. longo, 0.5 mm. lato quam urabella breviore vel aequali; capitulis elongatis polystachyis; spicis oblongo-lanceolatis acutis, 3.5 mm. longis; squamis ovatis acutis, 2.25-2.5 mm. longis; stylo 3-fido; achaenio trigono obovoideo, 0.6-0.8 mm. longo, subtilissime punctulato. Inflorescence many-rayed, 5-8 cm. long, 1-2.5 cm. wide, the rays erect-ascending; spikelets densely clustered or fascicled, terminating many branches, about 4-flowered; scales 7-8, lower empty, castaneous or ferruginous-brown, ovate, acute or shortly arista te with exserted midrib, glabrous or very minutely ciliolate on margins; achene buff or pale greenish-white, about 1 mm. wide around summit. (Fig. 5, a). Type in herb. Chi. Nat. Hist. Mus., collected on dry flat savanna with Curatella, between Upata and Rio Caroni^ state of Bolivar, alt.
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o 2 CM XI E> RAR.Y OF THL UNIVERSIT
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