1957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



277 



1950, Bassett Maguire, R. S. Cowan & John J. Wurdack 29572; U.S. National 

 Herbarium No. 2,040,213- 



Andropogon vetus Sohns, sp. nov. Figure 12. 



Perennis; culmi erecti, 1-4 m alti, glabri vel glauci; vaginae crassae, glabrae, 

 internodiis longiores; ligula membranacea, 3-5 mm longa; laminae 60 cm longae 

 vel longiores, versus basin crassas, usque ad 1.5 cm latae vel latiores, omnes 

 glabrae, attenuatae; racemi subcompositi in apice culmorum, elongati, solitarii, 1-3 

 cm longi; articuli 2-3.5 mm longi, marginibus longe pilosi; spiculae sessiles 

 3.7-5.3 mm longae; gluma inferior spiculam aequans, dorso plana, marginibus 

 implicatis, glabra, versus summam scaberrima, 6-nervis; gluma superior primam 

 subaequans, 1-3-nervis, carina versus summam scaberrima; lemma sterile mera- 

 branaceum, vacuum; lemma fertile glumis circiter 1 mm brevior, apice bifidum; 

 arista 1-2.5 cm longa, columna torta; palea lemmati subduplo brevior, carinis 

 ciliolatis; lodiculae 2, 0.5-0.7 mm longae, truncatae; stamina 3; antherae 1.5-2 

 mm longae; pedicelli 3.5-3.8 mm longi, marginibus longe pilosi; spiculae pedi- 

 cellatae 2.4-3.9 mm longae; anthoecia nulla (vel interdum cum lemmate sterili). 



Perennial; culms erect, 1-4 m tall, glabrous (glaucous in the field); sheaths 

 thick, glabrous, longer than the internodes, open; ligule a membranaceous rim 

 3-5 mm long, the margin of the sheath auriculate at the summit; blades long, 

 thickened at the base, almost petiole-like, up to 60 cm long, to 1.5 cm wide, 

 glabrous on both surfaces, the tip attenuate; inflorescence of numerous aggregate 

 racemes; racemes solitary on each peduncle, 1-3 cm long, partially enclosed by 

 the subtending spathe; rachis-joints 2-3.5 mm long, rounded on the back, flat on 

 the adaxial side, long-pilose on the margins, the hairs 1-3 mm long, the apex 

 cup-shaped, the rachis-joints hollow (vascular bundles were present in the inter- 

 nodes without surrounding parenchyma tissue); lowest pair of s pikelets dissimilar, 

 one sessile and one pedicellate; sessile spikelet 3.7-5.3 mm long spikelets 

 toward the tip of the raceme longer); first glume as long as the spikelet, flat on 

 the back, the margins inrolled, glabrous, scaberulous toward the tip, 6-(or more) 

 nerved, the laterals faint or obsolete, scaberulous on the keel toward the tip; 

 first floret represented by a 2-keeled, thin, membranaceous, empty lemma; fertile 

 lemma about 1 mm shorter than the glumes, bifid at the apex, the membranaceous 

 tips about 1 mm long, awned from between the lobes, the awn geniculate, 1-2.5 

 cm long, twisted 3-4 times to the first bend, brown, the tip about 1 cm long, 

 pale, scaberulous; palea about half as long as the lemma, 2-keeled, ciliolate on 

 the keels and at the tip; lodicules 2, truncate, 0.5-0.7 mm long; stamens 3, the 

 anthers 1.5-2 mm long; pistil well-developed; pedicel 3.5-3.8 mm long, long- 

 pilose on the margins; pedicellate spikelet 2.4-3.9 mm long (pedicellate spike- 

 lets longer toward the tip of the raceme), the first and second glumes developed 

 (sometimes a sterile lemma present). 



TYPE: locally frequent, northwest slopes, Cerro Yapacana, Rio Orinoco, 

 Terr. Amazonas, Venezuela, January 1, 195 1» Bassett Maguire, R. S. Cowan & 

 John J. Wurdack 30519; U.S. National Herbarium No. 2,040,240; 2-3 m high, 

 frequent in thickets on left branch of Cano Yutaje, elev. 1200 m, Serrania Yutaje, 

 Ri'o Manapiare, February 25, 1953, Bassett Maguire & Celia K. Maguire 35410. 

 Trachypogon ramosus Swallen, sp. nov. 



Perennis; culmi erecti robusti ca. 2 m alti, ramosi, ramis erectis nodis bar- 

 batis; vaginae, superioribus exclusis, internodiis multo longiores, glabrae, 

 auriculatae; ligula usque ad 12 mm longa, firma, acuta vel subacuminata; lami- 

 nae usque ad 27 cm longae, 5-8 mm latae, attenuatae, superiores minores re- 

 flexae; racemi 3 vel 4, adscendentes, 4-13 cm longi; spicula fertilis 8 mm longa, 

 callo 2 mm longo dense barbato pilis ad 3 mm long is; gluma prima pilosa ad 

 summam pilis longis; lemma sterile gluma prima brevius, tenuissimum, truncato- 



