1957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



269 



Leafy culms 40 cm high with three leaves at the summit and another smaller 

 one a short distance below; sheaths glabrous or minutely pubescent at the summit 

 with glandular spots at the throat and a very few short fimbriate bristles; blades 

 16-19. 5 cm long, 5.2-5.8 cm wide, acuminate, ovate, very glaucous on the under 

 surface, granular along the nerves; bladeless fertile culm 42 cm long, ascending, 

 mostly covered by the purplish sheaths; inflorescence 8 cm long, pale, exserted, 

 the whorls 7 mm long, the pedicels 2 mm long, rather densely pilose at the base; 

 staminate spikelet: glumes 3-4 mm long, acute, 1- or sometimes 2-nerved, only 

 somewhat decurrent, one narrower than the other, usually finely ciliate below the 

 middle; lemma 4.5-5.0 mm long, 2.5-3 mm wide, obtuse, scaberulous, tinged with 

 violet; anthers 3 mm long. 



TYPE: vicinity of base camp, alt. 175 m, Cerro Sipapo (Paraque), Amazonas, 

 Venezuela, December 25, 1948, Bassett Maguire & Louis Politi 27940; New York 

 Botanical Garden. 



Andropogon indetonsus Sohns, sp. nov. Figure 8. 



Perennis; culmi erecti, 2-3 m alti, nodi glabri; vaginae glabrae, internodiis 

 breviores; ligula 1.8-2 mm longa, membranacea; laminae 30 cm longae vel longi- 

 ores, usque ad 15 mm latae, marginibus scaberrimae, omnes glabrae vel basin 

 supra longe papilloso-pilosae; inflorescentia usque ad 30 cm longa; racemi 2-3, 

 2.5-8 cm longi, recti vel leviter arcuati, dense albo-pilosi; articuli 3-5 mm longi, 

 marginibus longe pilosi, dorso tenuiter scaberrimi; spiculae sessiles 4.5*5.5 mm 

 longae; gluma inferior spiculam aequans, 6-nervis, sulcata, marginibus versus 

 summam scabrae; gluma superior primam aequans, carinis superne scaberrimis; 

 lemma sterile glumam brevior, membranaceum, enerve; lemma fertile 3*3.5 mm 

 longum, membranaceum, bifidum; arista laxe torta, 1-1.5 cm longa, scaberrima; 

 palea lemmati subduplo brevior, membranacea, enervis; lodiculae 2, 0.5-0.8 mm 

 longae, membranaceae; stamina 3; antherae 2-2.2 mm longae; pedicelli 3-5 mm 

 longi, plani, marginibus pilosi, alioqui glabri vel scaberuli; spiculae pedicel- 

 latae 3.5—5 mm longae; gluma inferior 9-nervis, marginibus superne scaberrima; 

 gluma superior primam subaequans, membranacea, carinata, 3 (-5)-nervis, margi- 

 nibus superne tenuiter ciliolata; lemma sterile glumas subaequans, 3-nerve 

 membranceum, marginibus tenuiter ciliolatum; lemma fertile 3-3.5 mm longum, 

 1-nervium; lodiculae 2, 0.5 mm longae; stamina 3; antherae 2 mm longae; ovarium 

 nullo. 



Perennial, culms erect, 2-3 m tall; nodes glabrous; sheaths glabrous, shorter 

 than the internodes; ligule 1.8-2 mm long, firm, membranaceous; blades 30 cm or 

 more long, up to 15 mm (probably more) wide, the margins scabrous, the tip 

 acuminate and convolute, densely long papillose-pilose at the base on the upper 

 surface behind the ligule; inflorescence 30 cm or more long, consisting of two or 

 three branches from each of the upper nodes, the terminal branch of each fascicle 

 long-exserted, the spathes not inflated; other branches with inflated spathes; 

 racemes 2-3 per peduncle, 2.5-8 cm long, mostly straight or slightly curved, 

 densely white hairy; rachis-joints 3- 5 mm long, long-pilose on the margins 

 and occasionally on the back in definite lines, finely scaberulous over the 

 back; spikelets paired, one sessile and one pedicellate; sessile spikelet 4.5-5.5 

 mm long; first glume as long as the spikelet (excluding the awn), 6-nerved, 

 longitudinally sulcate, scabrous on the margins near the tip; second glume as 

 long as the first, strongly keeled, scabrous on the keel toward the tip; sterile 

 lemma about 1 mm shorter than the glumes, thin, nerveless (occasionally addi- 

 tional faint lateral nerves can be seen); fertile lemma 3-3.5 mm long, thin, trans- 

 parent, bifid at the apex, awned from between the lobes, the lateral nerves faint 



