1957} 



THE BOTANY OF THE GUAYANA HIGHLAND— PART II 



265 



TYPE: bunch grass on savanna; lateral south drainage of "North Valley", 

 alt. 1700 m, Cerro Guaiquinima, Rio Paragua, Bolivar, Venezuela, January 2, 

 1952, Bassett Maguire 32899; New York Botanical Garden. 



Ichnanthus amplus Swallen, sp. nov. 



Perennis; culmi robusti, erecti, 2.25 m alti, foliosi nodis pilosis; vaginae 

 internodiis longiores, glabrae, marginibus papilloso-ciliatae collo dense villosae; 

 ligula membranacea, 0.6 mm longa; laminae usque ad 45 cm longae, 3.6 cm latae, 

 acuminatae, ad basin angustiores, ad margines papillosae vel papilloso-pilosae, 

 marginibus scabrae; panicula 45 cm longa, laxa, ramis verticellatis, scabris, 

 inferioribus usque ad 30 cm longis, ramulis divergentibus; spiculae 3.6-3.8 mm 

 longae; gluma prima spicula paulum brevior. acuta, scabra, marginibus sparse 

 pilosa, 3-5-nervis; gluma secunda et lemma sterile aequalia, subobtusa, fructu 

 paulum longiora, 5-7-nervia, plus minusve scabra; fructus 2.8 mm longus, sub- 

 acutus, laevis, lucidus, alis 0.5 mm longis. 



Perennial; culms coarse, erect, 2.25 m high, leafy, the nodes appressed- 

 pilose; sheaths all longer than the internodes, glabrous, the margins papillose- 

 ciliate, the collar densely villous, the mouth truncate; ligule membranaceous, 

 0.6 mm long with a line of hairs behind it 1-3 mm long; blades as much as 45 cm 

 long, 3.6 cm wide, acuminate, gradually narrowed to the base but not petiolate, 

 papillose or papillose-hairy near the margins at the base, the margins scabrous; 

 panicle 45 cm long, rather lax, the branches in somewhat distant verticels, 

 scabrous, the lower ones as much as 30 cm long, the branchlets spreading; 

 spikelets 3.6-3.8 mm long; first glume nearly as long as the spikelet, acute, 

 scabrous, occasionally with a few hairs on the margins, 3-nerved or sometimes 

 5-nerved; second glume and sterile lemma equal, subobtuse, slightly longer than 

 the fruit, 5-nerved or sometimes 7-nerved, more or less scabrous; fruit 2.8 mm 

 long, subacute, brown at maturity, smooth and shining; wings 0.5 mm long. 



TYPE: locally frequent in secondary thicket by clearing, Kataima, alt. 550 m, 

 Upper Mazaruni River, British Guiana, November 17, 1951, Bassett Maguire & 

 D. B. Fanshawe 32633; New York Botanical Garden. 



Related to Ichnanthus ichnodes (Griseb.) Hitchc. & Chase which has much 

 smaller blades and spikelets. 



Ichnanthus tectus Swallen, sp. nov. Figure 7. 



Perennis; culmi erecti 115 cm alti; vaginae compressae, glabrae, internodiis 

 multo longiores suprema elongata basin paniculae attingens; laminae acuminatae 

 ad basin longiattenuatae inferiores ca. 65 cm longae (superiores breviores), 8- 

 10 mm latae, supra basi dense pilosae marginibus scabrissimae; panicula 25 cm 

 longae, erectae, ramis adscendentibus vel patentibus, scabrissimis, inferioribus 

 7-8 cm longis; spiculae 5 mm longae, appressae, dense scabrae, pedicellis 

 spiculis brevioribus; gluma prima 4 mm longa, obtusa; gluma secunda et lemma 

 sterile subaequalia, obtusa, fructu longiora; fructus 4 mm longus, acutus, summo 

 scabrus, stipitatus, alis 1.5 mm longis tenuibus plus minusve flabellatis. 



Perennial; culms erect, 115 cm high; sheaths much longer than the internodes, 

 the uppermost elongate, nearly reaching the base of the panicle, compressed, 

 glabrous; blades acuminate, long-attenuate toward the base, the lower ones about 

 65 cm long, the upper ones shorter, 8-10 mm wide, strongly scabrous on the 

 margins, densely hairy on the upper surface at the base; panicle 25 cm long, 

 erect, the branches very scabrous, stiffly ascending or spreading, the lower ones 

 7-8 cm long; spikelets 5 mm long, appressed, densely scabrous, the pedicels 



