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26 FIELDIANA: BOTANY, VOLUME 28 nacea ca. 1 mm. longa; laminae 7-25 mm. longae, 0.8-1 mm. latae, planae, firmae, erectae vel arcuatae, sparse longe pilosae; paniculae 1.5-3 cm. longae, ramis patentibus, gracilibus, paucifloris; spiculae 1-1.2 mm. longae, glabrae, pedicellis longis filiformibus divergentibus; gluma prima 0.5-0.6 mm. longa, acuta, 1-nervis; gluma secunda ca. 0.7 mm. longa, 5-nervis, obtusa; lemma sterile fructum aequans, 5-nerve, obcusum, flore masculo; fructus 0.9 mm. long us, ovatus, acutus, glaber. Very slender perennial; culms 10-19 cm. high, very densely tufted, erect, usually branching from all but the uppermost nodes, obscured by the many crowded blades; sheaths mostly longer than the internodes, glabrous; ligule membra naceous, about 1 mm. long; blades 0.7-25 mm. long, 0.8-1 mm. wide, flat, firm, erect or becoming arcuate, sparsely long-pilose, with thick white cartilaginous margins; panicles 1.5-3 cm. long, nearly as wide, the slender few-flowered branches spreading; spikelets 1-1.2 mm. long, glabrous, on long filiform divergent pedicels; first glume 0.5-0.6 mm. long, acute, 1-nerved; second glume about 0.7 mm. long, 5-nerved, obtuse; sterile lemma as long as the fruit, 5-nerved, obtuse, enclosing a well developed staminate flower; fruit 0.9 mm. long, ovate, strongly convex, acute, glabrous. Type in U.S. Nat. Herb., no. 1,911,642, collected in dry rocky open places, Esmeralda Ridge, between Esmeralda and base of Cerro Duida, Territorio Federal Amazonas, alt. 150 no., August 21, 1944, Julian A t Steyermark 57755. P anicum densifolium is similar to P> obovatum Doell, which has smaller, sub-spherical, pubescent spikelets 0.8 mm. long, and the second glume and sterile lemma are equal, covering the fruit. Panicum Mauryi Swallen, nom. nov. P anicum micro nth us var. hirtum Maury. Territorio Federal Amazonas: Sabana Grande, alt. 200 m., Steyermark 57863; between Esmeralda Ridge and Sabana de Arboles, alt. 200 m., 57780. Panicum pilatum Swallen, sp. nov. Perenne; culmi dense caespitose, 15-25 cm. alti, erecti, glabri vel intemodiis inferioribus dense pilosi; vaginae internodiis longiores, glabrae vel summo marginibus pilosae, ligula ciliata 1.5-2 mm. longa; laminae 3-4 cm. longae, 3-4 mm. latae, lanceolatae, acutae, glabrae vel marginibus basi sparse pilosae; paniculae 3-5 cm. longae, 1-2 cm. latae, ramis adscendentibus, glabris; spiculae 1.6 mm. longae, acutae, nervosae, glabrae, purpurascentes; gluma prima 0.7 mm. longa, angusta, subacuta; gluma secunda et lemma sterile aequalia, fructam aequantia; culmi auturanales ex nodis inferioribus et intermediis sparse ramosi, ramis et laminis pauloreductis.
BOTANICAL EXPLORATION IN VENEZUELA - I 27 Culms densely tufted, 15-25 cm. high, erect, glabrous, or sparsely pilose on the lower internodes; sheaths mostly longer than the internodes, glabrous or sparsely pilose on the margins near the summit; ligule ciliate, 1.5-2 mm. long; blades 3-4 cm. long, 3-4 mm. wide, lanceolate, acute, glabrous on both surfaces, the margins sometimes sparsely pilose toward the base; panicles 3-5 cm. long, 1-2 cm. wide, the branches ascending, glabrous; spikelets 1.6 mm. long, acute, strongly nerved, glabrous, tinged with purple; first glume 0.7 mm. long, narrow, subacute; second glume and sterile lemma equal, covering the fruit. Autumnal phase sparingly branching from the lower and middle nodes, the blades and panicles not much reduced. Type in U.S. Nat. Herb., no. 1,911,673, collected on rocky sandstone summit of eastern peak, Cerro Tururaiquire, state of Sucre, alt. 2500 m., May 6, 1945, Julian A. Steyermark 62606. Panicum pilatum belongs in the subgenus Dicanthelium and most closely resembles P. caerulescens which differs in having subglobose pubescent spikelets and a very short ligule. Panicum vinaceum Swallen, sp. nov. Perenne; culmi erecti, 45 cm. alti, infra nodos pilosi adscendentibus; vaginae dense pilosae pilis adscendentibus; ligula ciliata, ca. 0.5 mm. longa; laminae 12-20 cm. longae, 4-7 mm. latae, lineares, acuminatae, adscendentes vel appressae, glabrae vel pilosae pilis divergentibus; panicula 12 cm. longa, 5 cm. lata, ramis solitariis adscendentibus, basi villosis; spiculae 6-6.5 mm. longae, purpurascentes; gluma prima 3 mm. longa, 3-nervis, abrupte acuta; gluma secunda et lemma sterile aequalia, 7-nervia, acuta vel subacuminata; fructus 3 mm. longus, 1.4 mm. latus, glaber, minute striatus. Perennial; culms stiffly erect, 45 cm. high, ascending-pilose below the nodes, otherwise glabrous; lower sheaths longer, the upper shorter than the internodes, densely ascending pilose, the hairs rather stiff; blades J2-20 cm. .long, 4-7 mm. wide, linear, acuminate, narrowly ascending or appressed, stiff, firm, nearly glabrous, or pilose on both surfaces with spreading hairs; panicle 12 cm. long, 5 cm. wide, the few solitary branches narrowly ascending, villous at the base, with a rather large pulvinus in the axils; spikelets 6-6.5 mm. long, purple, mostly in pairs at the ends of the branchlets, obliquely placed on the pedicels, the pedicels of the lateral spikelets short; first glume 3 mm. long, 3-nerved, rather distant, somewhat abruptly acute; second glume and sterile lemma equal, or the glume slightly longer, 7-nerved, acute or subacuminate, gaping; fruit 3 mm. long, 1.4 mm. wide, minutely striate, glabrous, raised on the thickened winged rachilla joint about 0.8 mm. long. Type in U.S. Nat. Herb., no. 1,91 1661, collected on Gran Sabana, between Kun and waterfall at Rue-meru (tributary of Rio Kukenan), south of Mount Roraima, state of Bolivar, alt. 1065 m., October 2, 1944 Julian A. Steyermark 59173.
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Page 7: FIELDIANA: BOTANY A Continuation of
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