322 I'OACE/K. 



111. I'lanI ()(»-!»() cMi lii<,'li (r) 



r. Upper ligulo ;{-') nini. Ion;;, puiiicle 



raist'd '^0 cm. uhovo tlio upper leaf. . :ii 

 r. I'ppcr ligiilo 5-!) mm. lon^', culm 



G0-«() cm. Iii^rli (s) 



s. Spikok'ts 2.5-1$ mm. long, densely 

 flowering on the upper third of the 



briinches 25 



s. Spikelets 3-4 mm. long, rays 

 llowering from about the middle. . 20 

 1. A. Elliottiana Schult. .Mant. 2::}r2 (1.S24). A. amchnoidvs 

 Ell. Hot. S. C. &, (Ja. 1: IIU (IHIT). not I'oir. 

 (1810). 



Culms tufted, weak and slender. .'50-50 cm. high. Sheaths 

 scabrous; ligule 3 mm. long: blades narrow, thin, 2-8 cm. long. 

 Panicle exserled, weak and dilTuse when mature, rave scabrous, 

 cai)illary in remote half-whorls of 3-0, branching above the middle, 

 flower-bearing at and near the tips. Spikelets nearly 2 mm. long; 

 enijjty glumes subequal, scabrous on the keel, scarcely acute when 

 spread; floral glume 1.5 mm. long, 5-nerved, with 2 minute bristles 

 at the truncate apex, and a very slender flexnose awii 7 mm. long, 

 on the back a little below the apex; palea smaller than its glume 

 or Avantiug. 



The panicles of this species much resemble those of A. {acnhra) 

 hii'inalis, but the very slender awns enable us very readily to dis- 

 tinguish one from the other. Possibly it is an awned form of A. 

 hivmalis. 



Tennessee to Texas. April to May and June. 

 2. A. exigua Thurb. S. Wats. Bot. Calif. 2: 27.5 (1880). 

 A dwarf annual, 3-10 cm. high, sometimes branching near the 

 base. Sheaths very Ioofc; ligule about 2 mm. long, acute; blades 

 4-30 mm. long, mostly convolute, rough. Panicle half the length 

 of the plant, included, at length open, lower rays about 5, others 

 in pairs, the longest 2.5 cm. long, bearing 1-5 spikelets above the 

 middle. Spikelets 1.5 mm. long, empty glumes obtuse, purplish, 

 clothed with minute scattered hairs ; floral glume as long as the 



