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MEMOIRS OF THE NEW YORK BOTANICAL GARDEN '[Vol. 9, No. 3 



lets stiffly ascending, with long fine hairs in the axils; spikelets 1-1.2 mm long, 

 pilose or papillose-pilose, the filiform pedicels mostly 3-4 mm long; first glume 

 acute, about half as long as the spikelets; second glume obtuse, 2/3-3/4 as long 

 as the fruit; sterile lemma subacute, pointed beyond the fruit; fruit acute, white, 

 shining. 



TYPE: frequent in moist pockets on crystalline laja, 1-1.5 km east of Hotel 

 Amazonas, Puerto Ayacucho, alt. 100-200 m, Great Rapids of the Orinoco, Terr. 

 Amazonas, Venezuela, November 7, 1953, Bassett Maguire, John J. Wurdack & 

 George S. Bunting 36043; U. S. National Herbarium No. 2,182,149. 



The very slender culms with long internodes and small blades are character- 

 istic. 



Panicum subinclusum Swallen, sp. nov. 



Perenne; culmi erecti 30-45 cm alti, pauciramosi; vaginae internodiis paulum 

 breviores, glabrae; ligula arcuata, 0.5-1 mm longa; laminae 2.5-6.5 cm longae, 

 3-9 mm latae, acutae, appressae, basi sparse longe pilosae; paniculae usque ad 

 6 cm longae, 2 cm latae ramis gracilissimis adscendentibus; spiculae 1.1-1.2 

 mm longae, acutae, pilosae vel papilloso-pilosae; ^luma prima acuta vel subacuta 

 spicula ca. 1/2 brevior; gluma secunda obtusa fructu brevior; lemma sterile 

 subacutum fructu longius; fructus 1 mm longus, plano-convexus, subacutus. 



Perennial; culms erect, 30-45 cm high, sparingly branching, the branches 

 apparently somewhat spreading; sheaths nearly as long as the internodes, gla- 

 brous; ligule high-arcuate 0.5-1 mm long; blades 2.5-6.5 cm long, 3-9 mm wide, 

 acute, narrowed toward the base, bearing a few long hairs on the upper surface 

 toward the base, appressed; panicles as much as 6 cm long, 2 cm wide, or smaller 

 on the branches, partly enclosed in the sheath, the very slender branches ascend- 

 ing; spikelets 1.1-1.2 mm long, acute, pilose or papillose-pilose; first glume 

 acute or subacute, half as long or a little more than half as long as the spike- 

 let; second glume obtuse, shorter than the fruit; sterile lemma subacute, slightly 

 exceeding the fruit, containing a well developed palea and staminate flower; 

 fruit 1 mm long, strongly plano-convex, subacute. 



TYPE: locally abundant, wet places on rocks, 15 km above San Fernando de 

 Atabapo, Rio Atabapo, Rio Orinoco, Amazonas, Venezuela, October 17, 1950, 

 Bassett Maguire 29271; U. S. National Herbarium No. 2,040,199. 



The perennial habit, relatively small, partly included panicles, and large 

 appressed blades are characteristic. 

 Panicum fonticolum Swallen, sp. nov. 



Annuum? Culmi 20-35 cm longi 5 adscendentes 9 parte inferiore decumbentes 

 vel prostrati; vaginae glabrae vel sparse pilosae internodiis multo breviores; 

 ligula 0.4 mm longa, tenuis, truncata; laminae 2-3.5 cm longae, 2-4 mm latae, 

 acuminatae, patentes, glabrae, tenuis; paniculae 2.5-6 cm longae, ramis soli- 

 tariis adscendentibus ex basi ramosis; spiculae 1.3-1.4 mm longae, ellipticae 

 vel obovatae, acutae, sparse pilosae; gluma prima angusta, acuta, 1-nervis, 

 spicula 1/3-1/2 brevior; gluma secunda et lemma sterile aequalia fructu longiora; 

 fructus 1 mm longus, ellipticus, subobtusus, albus, striatus. • 



Annual? Culms 20-35 cm long, ascending, the lower part decumbent or 

 prostrate with short internodes, leafless or the leaves soon deciduous, the upper 

 internodes gradually longer; sheaths glabrous or very sparsely pilose, much 

 shorter than the internodes; ligule thin, truncate, about 0.4 mm long; blades 2- 

 3.5 cm long, 2-4 mm wide, acuminate, somewhat narrowed toward the base, thin, 

 spreading, glabrous; panicles 2.5-6 cm long, the slender solitary branches stiffly 



