1957] 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



253 



lati, 8-15 cm longi; rhachis 0.6-0.8 mm lata, viridis, scaberrima, ad basin pilis 

 sparsis 1-2 mm longis adspersis, in 25 mm 10-11 spiculis praedita; spiculae 2.2- 

 2.4 mm longae, 0.8 mm latae, ovatae vel oblongae, purpureae; gluma et lemma 

 sterile aequalia, 5-7-nervia, pilorum brevium adpressorum albidorum lineis 

 conspicuis inter nervos munita, pilis basi densioribus; pedicellus 0.3 mm longus; 

 flosculus 2.1-2.2 mm longus, spicula paulum brevior, pallidus, sub brunneo- 

 nitens, lemmate fertile apice piloso pilis brevibus. 



Erect perennial with densely hairy foliage; culm 1.6 m high, 5 mm thick at the 

 base, compressed, yellowish; nodes 8, densely long-appressed-hairy; sheaths 

 3-30 cm long, 0.7-1.0 cm wide, the uppermost longest, densely hairy, keeled, the 

 collar a dense transverse line of hairs, without a wedge-shaped area; ligule 0.4- 

 0.5 mm long, the ciliate portion longer than the base; blades 7-25 cm long, 15- 

 20 mm wide (open), lax, lanceolate, acuminate, densely hairy on both surfaces 

 with few to several long hairs 1-2 mm long on the upper surface at the base, 

 glabrescent toward the apex, the margins very scabrous; inflorescence terminal; 

 peduncles single, about 1 mm thick, 45 cm long, g reenish; panicle 23 cm long, the 

 axis 10 cm long; racemes 12, laxly ascending, the lower ones fasciculate, 8- 

 15 cm long; rachis 0.6-0.8 mm wide, green, markedly scabrous, sometimes with a 

 few hairs 1-2 mm long toward the base; spikelets 10-11 per 25 mm, exceeding the 

 rachis by one quarter of their width, 2.2-2.4 mm long, 0.8 mm wide, dark purple, 

 ovate to oblong, obtuse, the pedicels 0.3 mm long; glume and sterile lemma 

 equal, 5-7-nerved, with characteristic, though not copious, lines of white ap- 

 pressed hairs between the nerves, hairiest at base; fertile floret 2.1-2.2 mm long, 

 minutely shorter than the spikelet, pale brown, obtuse, with a tuft of hairs at the 

 apex. 



TYPE: coarse bunch grass; occasional in valley woodland south of airstrip, 

 alt. 700 m, Serra Tepequem, Terr, do Rio Branco, Brazil, November 29, 1954, 

 Bassett Maguire & Celia Maguire 40108; U. S. National Herbarium No. 2,182,169. 



Axonopus suffultiformis Black, sp. nov. Figure 5b. 



Perennis; culmi ca. 1 m alti, crassi; nodi 1-2, glabri; vaginae 8-9 cm longae, 

 5-7 mm latae, fortiter carinatae, conduplicatae, basi confertae, flabelliformes 

 (Axonopum pruinosum simulans); ligula 0.2 mm longa; laminae 20-40 cm longae, 

 5-6 mm latae (duplicatae), conduplicatae, obtusae, apice nonnumquam fissae, 

 glabrae, deciduae, pallido ovilaceae; inflorescentiae terminates 25-30 cm longae; 

 paniculae 10-15 cm longae, axi 1-3.5 cm longo; racemi 9, subdigitati, ca. 5- 

 13 cm longi, axillis pilis perbrevibus mollibus interdum pilis longis praeditis; 

 rachis 0.5 mm longa, viridis, dorso glabra, marginibus scabrida, pedicellorum basi 

 pilis 0.5-0.8 mm longis praedita, in 25 mm spiculis 24-26 praedita; spiculae 2 mm 

 longae, 0„7-0 o 8 mm latae, pallidae; gluma lemma sterile aequans, 5-nervis, nervis 

 prominulis, glabra, vel basi sparse pilosa; flosculus spiculae longitudinem ae- 

 quans, pallido-fulvus, glaber vel ad apicem paucissimis pilis perbrevibus prae- 

 ditus. 



Erect perennial with pale green, rigid, mostly glabrous foliage; culm 1 m tall, 

 2.5-3 cm thick at the base including the leaves, little compressed; nodes 1-2, 

 glabrous; sheaths 8-9 cm long, 5-7 mm wide, conduplicate, strongly keeled, 10- 

 20 at the base, flabellate (like Axonopus pruinosus Henr.); ligule a membranous 

 line 0.2 mm long; collar a thin transverse line; blades 20-40 cm long, 5-6 mm 

 wide (folded), conduplicate, obtuse, often splitting at the tip, glabrous, pale 

 olivaceous, deciduous; inflorescence terminal; peduncles 2, 25-30 cm long; 

 panicle 10-15 cm long, the axis 1-3.5 cm long; racemes 9, subdigitate, ascend- 



