196 



POACE.E. 



d. Panicle spikelike, rays mostly sessile, first glumo 



4-5 mm. long 21 



d. Panicle racemose or spreading, first glume ?-!> 

 mm. long 32 



1. A. desmantha Trin. & Uupr. Mem. Acad. St. Pctersb. (VI.) 

 MOO (1841)). 



A slender sparingly-bniuched grass, 30-50 cm. high. Sheaths 

 mostly shorter than the internodes; ligule short clliate; blades in- 

 volute, setaceous, smooth below, S-'^O cm. long, nnirgins of the 

 blade and sheaths also sometimes ciliate. I*anicle -iniple, few- 

 flowered, 8-15 cm. long, rays scabrous, remote. Empty glumes 

 ciliate, 1-nerved, etjual, 2-tootlu'd, 10-13 mm. long, besides short 

 bristles; floral ghnne about 10 mm. long to the jointed, separate 

 awns, V. Inch are equal and horizontally s})readiug when dry. 



Texas, livt'crrhon 105 T. 



Texas and Indian Territory. 



2. A. tuberculosa Nutt. (ien. 1:51 (1818). 



Culms 2-5 cm. high, branching below, nodes tumid; the inter- 

 nodes mostly naked, as the l)ranches crowd the sheaths away. 



Sheaths smooth, twice as long as the 

 internodes, to which they really belong; 

 ligule a ciliate fringe; leaves of sterile 

 shoots very few and short, those of the 

 <'ulm 2-3 in number, blades involute, se- 

 taceous, 10-20 cm. long, scabrous above, 

 smooth below. Panicle rigid, open, spar- 

 ingly bnmched, 10-18 cm. long. Empty 

 glumes brown, 15 IT mm. long, tlie 

 strong nerves scabrid; first glume 

 shorter, the awned tips 5-10 mm. long; 

 floret nearly 15 mm. long, with a hairy 

 pointed callus at the base, and at the 



apex the three awns are twisted and 

 Fio.40. — Anstida tuberculosa. 

 A, spikelet; a, Horet; 6,cftl- anchylosed or soldered together Tor 

 lous be«rd,.a base. (Scribner.) ,^^^^^^ ^ ^^^^ .^^^^^ ^^jji^j^^ ^^^ maturity, 



the three nearly equal tips become divergent or reflexed for 3-4 cm.. 



