406 



MEMOIRS OF THE NEW YORK BOTANICAL GARDEN 



[Vol. 9, No. 3 



Perennial; erect, one or more m tall, the nodes glabrous; sheaths glabrous, the 

 lower shorter than the internodes, the upper longer; ligule a membranous rim, 

 1.5 mm long; blades long-attenuate, up to 45 cm long, to 2 cm wide, glabrous on 

 both surfaces, sparingly long-pilose on the upper surface at the base back of the 

 ligule, the margins antrorsely scabrous; inflorescence of numerous spatheate 

 racemes, a single raceme terminating each peduncle; racemes 1-4 cm long, 

 mostly enclosed by the spathes; rachis-joints mostly 3 (3.2) mm long, densely 

 pilose on the margins, the ad- and abaxial faces glabrous; spikelets 2 at each 

 node of the raceme, one sessile, the other pedicellate; sessile spikelet about 4 

 (to 4.2) mm long; first glume 4-nerved (2 additional indistinct lateral nerves 

 sometimes present), dorsally flattened, slightly sulcate, the margins inflexed, 

 firmly clasping the second glume, the margins and tip scaberulous; second glume 

 slightly shorter than the first, 3-nerved, strongly keeled, the keel antrorsely 

 scabrous, sometimes slightly awn-tipped; sterile lemma 2.8-4 mm long, 3"nerved 

 (sometimes 2 additional lateral nerves present), the median nerve developed, the 

 margins shortly ciliolate; palea sometimes present as a thin, membranous scale, 

 about half as long as the sterile lemma; fertile lemma 2-3.2 mm long, bifid at the 

 apex,awned from between the lobes; awn loosely twisted, 5-8 mm long, antrorsely 

 scabrous; palea membranaceous, 2-2.5 mm long; lodicules 2, 0.5-0.7 mm long, 

 fused at the base to the lemma and palea; stamens 3, the anthers 1.5-1.8 mm long 

 (in some florets the anthers appear flat, empty, and without evidence of pollen 

 formation); ovary developed; pedicel of the pedicellate spikelet slightly shorter 

 than the rachis-joint, densely pilose on the margins; pedicellate spikelet 3-4 mm 

 long, reduced to the glumes; first glume 5-nerved, the median nerve developed. 



TYPE: along base of southeast-facing sandstone bluffs of Chimanta-tepui 

 (Torono-tepuf), from south corner northeastward, alt. 1700 m, Chimanta Massif, 

 Estado Bolivar, Venezuela, May 21, 1953, Julian A. Steyermark 75515 (US 

 2,182,901). 



A striking species of Andropogon with long-attenuate blades. 



Andropogon diuturnus Sohns, sp. nov. (Fig. 77.) 



Perennis, dense caespitosus; culmi erecti, 20-65 cm alti, multinodes; vaginae 

 glabrae, superiores internodiis breviores; laminarum superiorum saepissime 

 obsoletae; ligula 1.5-1.7 mm longa, membranacea, apice ciliolata; laminae usque 

 ad 15 cm longae, usque ad 5 mm latae, omnes glabrae vel leviter scaberrimae, 

 prope basin saepius pilosae, subtus costa media alba; racemi solitarii, interdum 

 bini, plerumque 4-5 cm longi, recti vel leviter flexuosi, dense albo-pilosi; articuli 

 dense longeque pilosi; spiculae sessiles 4.1-6 mm longae (plerumque 5.2 mm); 

 glumS inferior plana, longitudine sulcata, glabra, summitatem versus scabra, 

 saepe bidentata; gluma superior primam aequans, valde carinata, 3-nervia, apice 

 scaberrima; lemma sterile 0.9-1.5 mm longum, membranaceum, marginibus 

 ciliolatum; lemma fertile membranaceum, 3-nervium, apice bifidum; arista 7.5-14 

 mm longa, scabra; palea 1-2 mm longa, enervia, saepe fissa; lodiculae 2, 0.5-0.7 

 mm longae, truncatae; stamina 3; antherae 1-1.5 mm longae; pedicellus spiculam 

 sessilem subaequans, marginibus dense longeque pilosus; spiculae pedicellatae 

 1.1-4.3 mm longae; anthoecia nulla. 



Perennial, densely tuf.ted; culms erect, 20-65 cm tall;- nodes several, the 

 lower internodes short; sheaths glabrous, longer than the lower internodes, 

 shorter than the upper; ligule a membranous rim, the tip ciliolate, 1.5-1.7 mm 

 long, the margins of the sheath auriculate; blades mostly evenly distributed 

 along the culm, progressively shorter upward, 0.1-15 cm long, 0.5-5 mm wide, 

 glabrous or slightly scaberulous on both surfaces, occasionally with a few hairs, 



