FEB. 1903. PLANT/E YUCATAN^E MILLSPAUGH & CHASE. 



37 



Hab. North shore of Island of Cozumel, Feb. 18-19, 1899, 

 Millspaugh PL Utowance 1483, 



Oplismenus Burmannii (Retz) Beauv. Agrost. 54.1 

 Panicum Burmannii Retz. 

 Oplismenus cristatus Presl. 



Panicle finally exserted, 5-7 cm. long, of 8-12 one-sided racemes; 

 axis densely long-hirsute; racemes ascending, 1-2 cm. long. Spike- 

 lets single in two rows on one side 

 of the flattened, hairy rachis, 3.5-4 

 mm. long (excluding awns), silvery 

 green, clothed with long, white 

 hairs at the base. First and sec- 

 ond glumes subequal, deeply 

 emarginate, f-rierved, ciliate, bear- 

 ing slender, antrorsely scabrous 

 awns, that of first glume 12-20 

 mm., of second, 8-10 mm.; third 

 glume emarginate, 9 n nerved, 

 ciliate, and with a band of long, 

 white hairs about the middle, awn 

 i mm.; fruiting glumes .8x2.3 

 mm., greenish-white, lanceolate- 

 ellipsoid, acute, smooth and shining, .75x1.9 mm.; in section sub- 

 orbicular. Grain translucent pinkish cream, lanceolate-ellipsoid, 

 acute. 



Hab. Merida at Quinta del Obispo, Nov., 1864, Schott 55, and 

 Merida, July, 1865, 384; " Common about the mouths of caves around 

 cenots and aguadas in densely shady places, 3 feet high," Oct., 

 Gaunter fOjS, San Anselmo 2026, 2428, Calotmul 2429. 



A variable species, especially in the length of the awns and basal 

 hairs of the spikelet. 



CH^TOCHLOA Scribn. U. S. Dept. Agr. Div. Agros. Bull. 4:38. 



Spikelets surrounded by a few or many persistent awn-like 

 branches which spring from the pedicels below the articulation of the 

 spikelets, giving the dense cylindrical spike-like panicle a bristly 

 appearance, i -flowered, or sometimes a staminate flower below the 

 terminal perfect one. Glumes 4, empty glumes membranaceous, 

 fruiting glumes coriaceous, rugose, the margins of the glume inrolled 

 over the palea. Grain dorsally compressed, enclosed in the fruiting 

 glumes, free. Stamens 3. 



Setae several geniculata. 



solitary polystachya. 



Chsetochloa geniculata comb, no v. (Lam.) Scribner& Merrill Am. 



Gr. Bull. 21:12. 

 Panicum geniculatum Lam. 

 Panicle long exserted, dense, 2-12 cm. long, 2 cm. wide (.6-. 8 



