HITCHCOCK REVISIONS OF NORTH AMERICAN GRASSES. 125 



Oplismenus cristatw Presl, Eel. Haenk. 1: 323. 1830. "Hab. in Mexico." The 

 type, in the German University at Prague, is labeled as coming from Luzdn. 

 - Oplismenus affinis Presl, Eel. Haenk. 1:323. 1830. "Hab. in Panama." The 

 name is independent of 0. affinis Schult. The type has been examined at the German 

 University in Prague. Presl states that it is probably only a variety of 0. cristatus. 



Orthopogon bromoides Loud. Hort. Brit. 25. 1830. Presumably based on Panicum 

 bromoides Lam., though no synonymy is cited. 



Panicum francoi Steud. Syn. PI. Glum. 1: 44. 1854. "Franco legit in Oaxaca." 

 The type has not been examined, but the description applies to Oplismenus burmanni. 

 S~jPanicum raddianum Steud. Syn. PL Glum. 1 : 45. 1854. Based on Oplismenus 

 - Jbmsiliensis Eaddi. 



Panicum sanctae-marthae Steud. Syn. PL Glum. 1: 45. 1854. "Hrbr. Funck nr. 437. 

 Sancta Martha Venezuelae." The type has notJ>een examined, but the description 

 applies to Oplismenus burmanni. 



Panicum schultesii Steud. Syn. PL Glum. 1: 46. 1854. Based on Oplismenus affinis 

 Schult. 



Oplismenus humboldtianus j3 muticus Fourn. Mex. PL 2:37. 1886. "Cuernavaca 

 (Bourg. n. 1301)." This collection, as well as Mullet 2016 and 2019 cited by Founder, 

 is represented in the U. S. National Herbarium. 



There are several other synonyms in works on Old World floras. 



DESCRIPTION. 



Plants annual ; culms'slender, glabrous or pubescent in lines or sometimes pubescent 

 all over, the flowering shoots as much as 40 cm. long, usually 10 to 20 cm. long, ascend- 

 ing or nearly prostrate; sheaths glabrous 

 or papillose-hispid, striate, ciliate on the 

 margin, villous on the collar ; ligule a very 

 . short membrane, ciliate with hairs about 

 1 mm. long; blades ovate to ovate-lanceo- 

 late, mostly 2 to 5 cm. long, sometimes 

 longer, 1 to 1.5 cm. wide, thin, more or 

 less pubescent or hispid on both surfaces, 

 especially toward the base, usually undu- 

 late on the margin ; panicle ovoid to linear 

 mostly long-exserted, usually compact, 2 

 to 5 cm. long, sometimes as much as 10 cm. 

 long, and the spikes more distant, mostly 

 nodding, the main axis villous; racemes 3 

 to several, appressed or ascending, rather 

 short and thick, white and silky, mostly 8 

 to 15 mm. long, the spikelets closely set 

 and nearly sessile on the rachis, this softly 

 villous and also beset, especially at the 

 base of the spikelets, with stiff papillose 

 hairs 2 to 3 mm. long; spikelets com- 

 pressed, whitish, several to many on each 

 rachis; first glume 3-nerved, half as long 

 as the sterile lemma, rather sparsely 

 appressed-villous, notched at the apex, 

 the midnerve extending as a slender, 

 straight, antrorsely scabrous awn 10 to 

 15 mm. long; second glume similar to the first, a little longer, 5-nerved, the 

 awn shorter; sterile lemma similar to the glumes, about 3 mm. long, compressed 

 above, nearly terete below, about 7-nerved, the lower half often copiously villous, 

 the awn shorter than those of the glumes, commonly 1 to 3 mm. long; fruit smooth 

 and shining, about as thick as wide, pale or brownish, about 2 mm. long. 



Fig. 21. — Oplismenus burmanni. From Reko 3473 

 Mexico. 



