33 



In thickets, Mexico. July-October. 



Specimens examined. — ^fexico: Southwestern Chihuahua, 52 (in part) E. Palmer 



1885; E. Palmer 1876; no locality, 233 Palmer 1897; Colima, 142 E. Palmer 1897; 



Oaxaca, 2788 Nelson 1895; Batopilas, 52, 110a Palmer 1885. 

 Readily distinguished by its yellowish-green color, broad, lanceolate, thin leaves, 



loose panicles, the branches not remote at the base, and its very strongly rugose 



flowering glumes. 

 CH.aETOCHIiOA LIEBMANNI PATJCIFLORA (Vasey) n. comb. Chamsera- 



phis caudata pauciflora Vasey in Beal Grasses of N. Am. 2: 158 (1896) . 

 A very slender form, 1 to 4 dm. high, with much smaller, narrow panicles 1 cm. in 



diameter, 5 to 10 cm. long, the 



branches not exceeding 1 cm. in 



length or obsolete, and smaller 



leaves 5 to 10 cm. long, 3 to 10 



mm. broad. Spikelets as in the 



type. 

 Mexico and Lower California. 

 Specimens examined. — Mexico: 



Southwestern Chihuahua, 52 (in 



part) Palmer 1885; Guaymas, 



191 Palmer 1887; Alamos, 686 Pal- 

 mer 1890. Lower California: San 



Jose del Cabo, 12 Brandegee 1890. 

 In habit very much resembling 



Chxtochloa grisebachii (Fourn.), 



but at once distinguished by its 



very strongly rugose flowering 



glumes. Chamxraphis caudata 



(Lam.) Beal, Grasses of N. Am. 



2: 157, to which this form was 



wrongly referred as a variety, is 



not true Panicum caudatum 



Lam., but Chsetochioa compofiita 



(H. B. K.), to which the above 



is not closelv related. 



tt Flowering glume smooth or finely 

 transversely wrinkled. 



§ Spikelets 3 mm. long. 



23. CH^TOCHLOA MACROS- 

 PERMA sp. nov. Setaria com- 

 posita of Chapman's Fl. So. J], S. 

 and of Bui. 7: 85. fig. 67, U.S. fiq.18.. 

 Dept. Agr., Div. Agros., not of 

 H. B. K. (Fig. 18.) 



A very smooth, stout perennial, 6 to 12 dm. high, with broad, flat leaves and branch- 

 ing, bristly panicles 10 to 25 cm. long. Culms cylindrical, robust, geniculate at 

 the base, glabrous; nodes smooth, sheaths compressed, striate, glabrous, the 

 lower exceeding, the upper shorter than, their internodes, margins ciliate; ligule 

 short, densely ciliate-f ringed with long white hairs; leaf -blades linear-lanceolate, 

 1 to 3 dm. long, 10 to 20 mm. wide, somewhat narrowed at the base, and long 

 slender acuminate at the apex, scabrous on both sides or sometimes nearly gla- 

 brous; margins cartilaginous, serrate-scabrous, midvein prominent below. 

 Panicle linear-ovate in outline, 2 to 4 cm. in diameter exclusive of the awns; 

 13788— No. 21 3 



-Ghcetochloa macrosperina: a, 6, views of the 

 spikelet; c, spikelet showing the setae. 



