31 



tt Branches loosely flowered. 



X Flowering glume strongly transversely undulate-rugose. 



§ Leaves pilose. 



21. ChaetocMoa latifolia Scribn. U. S. Dept. Agr., Div. Agros. Bui. 11: 44, pi. 



3 (1898). (Fig. 17.) 



" A branching annual, 2 to 4 dm. high, with compressed sheaths, rather broad, flat 

 leaves, and bristly panicles 4 to 8 cm. long. Culms compressed, slightly sca- 

 brous, and short bearded at the nodes; sheaths striate, scabrous, especially along 

 the keel, papillate-pilose, villous on the overlapping margin; ligule very short 

 and densely ciliate-f ringed with stiff hairs; leaf-blades broadly lanceolate, cor- 

 date at the base, very acute, 5 to 6 cm. long, 1 to 2 cm. broad, scabrous on both 

 sides and especially along the narrow, cartilaginous margins, strongly pilose 

 above and below. Branches of the panicle very short, slightly crowded; setse 

 12 to 18 mm. long, strongly antrorsely scabrous. Spikelets obovate, about 2 

 mm. long; first glume less than 1 mm. in length, 3-nerved; second glume 

 shorter than the flowering glume, 5-nerved; outer glumes all obtuse, the third 

 one empty; flowering or fruiting glume about 2 mm. long, strongly convex and 

 deeply transversely rugose excepting near the slightly apiculate apex. Palea 

 transversely rugose and similar in textm-e to the flowering glume. 



"Growing under bushes in deep ravines, Durango, Mexico, 879 E. Palmer 1896. 



"This species is well marked by its comparatively short and broad leaves, which 

 are cordate at the base, and long, widely spreading bristles." 



CHiETOCHLOA LATIFOLIA BREVISETA var. nov. 



A more slender form, with narrower, less pubescent leaves, which do not exceed 1 

 cm. in width, narrower, few-flowered panicles, and short appressed setae. 



Mexico. , 



Specimens examined. — Mexico: Oaxaca, 347 Conzatti & Gonzalez 1897; no locality, 



470 Palmer 1896. 



§§ "Leaves scabrous. 



22. CHiETOCHLOA LIEBMANNI (Fourn.) n. comb. Setaria liebmanni Fourn. 

 Mex. PI. Enum. Gram. 44 (1886) . 



An erect, glabrous, yellowish-green annual, 3 to 9 dm. high, with broad, flat, soft 

 leaves and loose, lanceolate panicles 1 to 2.5 dm. in length, 2 to 4 cm. in diame- 

 ter. Culms erect, simple, or sometimes sparingly branched from the base, gla- 

 brous, straw colored; nodes glabrous or the lower ones with few appressed hairs; 

 sheaths striate, loose, very glabrous, equaling or slightly exceeding the inter- 

 nodes, the margins cartilaginous, ciliate-f ringed with short hairs; ligule short, 

 densely ciliate-fringed with stiff white hairs about 1 mm. long. Leaf-blades 

 lanceolate, somewhat narrowed at the cordate base, long acuminate-pointed, 1 

 to 3 dm. long, 1.5 to 2 cm. wide, thin, pale, scabrous on both sides and especially 

 on the cartilaginous margins, midvein very prominent below, obscure above. 

 Panicle attenuate at both ends, the axis slender, channeled, scabrous; branches 

 approximate, erect-spreading, scabrous, slender, loosely few-flowered, 1.5 to 3 

 cm. long, much exceeding the internodes, not remote at the base; setae one at 

 the base of each spikelet, slender, flexuous, finely antrorsely scabrous, 10 to 15 

 mm. in length. Spikelets ovate, acute, 2 mm. long, pale, sometimes tinged with 

 purple; first glume cordate, inclosing the base of the spikelet, acute, 3-nerved, 

 one-third as long as the spikelet; second and third glumes broadly ovate, acute, 

 5 to 7 nerved, the second four-fifths as long as the spikelet, the third slightly 

 exceeding the flowering glume, nerves green, prominent; flowering glume about 

 2 mm. long, ovate, acute, short-apiculate, strongly convex, striate, very strongly 

 transversely undulate-rugose except near the apex; palea similar in texture 

 and markings to the flowering glume. 



