530 



MISC. PUBLICATION 200, U. S. DEPT. OF AGRICULTURE 



shaped, about 1.5 mm. wide, the 

 awns of lemma and rudiment about 

 1 mm. long. % — Plains and sandy 

 barrens, Texas, Oklahoma, and New 

 Mexico. 



Chloris radiata (L.) Swartz. Weedy 

 branching annual; culms 30 to 40 cm. 

 long, decumbent; blades thin, 2 to 3 

 mm. wide; spikes slender, several to 

 many, 3 to 8 cm. long; lemma nar- 

 row, 2.5 mm. long, the narrow rudi- 

 ment mostly included in its margins; 

 awns of lemma and rudiment very 

 slender, 5 to 10 mm. long. O — 

 Ballast, near Portland, Oreg. ; tropical 

 America. 



Chloris submutica H. B. K. Spar- 

 ingly stoloniferous, culms 30 to 65 

 cm. tall; sheaths compressed-keeled; 

 spikes 5 to 14, 3 to 8 cm. long, some- 

 what whorled on a short axis, spread- 

 ing; spikelets 3 to 3.5 mm. long; 

 fertile floret 3 to 3.5 mm. long, the 

 callus bearded, the lemma obtuse, 

 pilose toward the summit, awnless or 

 mucronate; rudiment truncate, awn- 

 less Ql — Dona Ana County, N. 



Mex., probably escaped from culti- 

 vation. Mexico. 



Chloris berroi Arech. Densely tufted, 

 culms 40 to 65 cm. tall, leafy; spikes and 

 spikelets much like those of C. ciliata, but 

 the 2 to 5 spikes closely and permanently 

 appressed, the rachises adhering, forming a 

 subcylindrical silky inflorescence. % — Oc- 

 casionally cultivated, Oklahoma and Texas, 

 introduced from Uruguay. 



Chloris ventricosa R. Br. Culms strag- 

 gling and rooting at the nodes, 40 to 90 cm. 

 long; spikes 3 to 5, 7 to 10 cm. long, flexuous, 

 spreading or drooping; spikelets about 5 mm. 

 long; fertile lemma subindurate, brown, 

 truncate, glabrous except for the pubescent 

 callus, awn 4 to 5 mm. long, that of the trun- 

 cate rudiment 1 to 2 mm. long. Ql — Oc- 

 casional^ cultivated, Virginia and Okla- 

 homa; introduced from Australia. 



Chloris caxterai Arech. Perennial, re- 

 sembling C. polydactyla, but blades only 2 to 

 5 mm. wide; spikes 2 to 4; spikelets slightly 

 larger. Ql — Spontaneous along roadsides 

 and in uncultivated ground, Bexar County, 

 Texas, introduced from Paraguay. 



Chloris truxcata R. Br. Stoloniferous 

 perennial; culms erect, 10 to 30 cm. tall; 

 spikes 6 to 10, 7 to 15 cm. long, horizontal or 

 reflexed; spikelets 3 mm. long, the awns 6 to 

 12 mm. long. Ql — Occasionally culti- 

 vated for ornament under the name star- 

 grass. Australia. 



111. TRICHLORIS Fourn. 



Spikelets 2- to 5-flowered, nearly sessile, in 2 rows along one side of a con- 

 tinuous slender rachis, the rachilla disarticulating above the glumes and pro- 

 longed behind the uppermost perfect floret, bearing a reduced, usually awned 

 floret; glumes unequal, acuminate, or short-awned, the body shorter than 

 the lower lemma; lemmas narrow, 3-nerved, the midnerve and usually the 

 lateral nerves extending into slender awns. Erect, slender, tufted perennials, 

 with flat scabrous blades and numerous erect or ascending spikes, aggregate 

 but scarcely digitate at the summit of the culms. Type species, Trichloris 

 pluriflora. Name from Latin tri, three, and Chloris, a genus of grasses, the 

 lemmas being 3-awned. 



Spikelets 2-flowered, both lemmas with 3 long awns 1. T. crixita. 



Spikelets 3- to 5-flowered, the lateral awns of the lemmas more or less reduced, sometimes 

 obsolete . 2. T. pluriflora. 



1. Trichloris crinita (Lag.) Parodi. 

 (Fig. 771, A.) Culms 40 to 100 cm. 

 tall; blades 2 to 4 mm. wide; inflo- 

 rescence dense, feathery, the spikes 

 5 to 10 cm. long; spikelets crowded; 

 fertile lemma about 3 mm. long, the 

 second lemma much reduced, both 

 with delicate awns about 1 cm. long. 

 Ql (T. mendocina (Phil.) Kurtz.) — 

 Plains, canyons, and rocky hills. 



western Texas to Arizona and north- 

 ern Mexico ; southern South America. 

 Rarely cultivated for ornament (as 

 T. blanchardiana Fourn.). 



2. Trichloris pluriflora Fourn. (Fig. 

 771, B.) Culms 50 to 100 cm. tall; 

 blades 5 to 10 mm. wide; inflorescence 

 looser and less feathery than in T. 

 crinita; spikes 7 to 15 cm. long; fertile 



