156 TKIANDRIA. DIGYNIA. andropocjon. 



1. A. scopariwn M i c h. : spikes simple, lateral and ter- 

 minal, pedunculate, in pairs ; rachis hairy ; abortive floret neu- 

 tral; valves awued. M i c h. Fl. I. p. 57. P urs h FL I. p. 

 74. Elliott Sk. 1. p. 146. A. purpurascens J\I iih I. Gram. 

 p. 282. fVilld. Spec. IV. p. 913. Pollinia scoparia 

 Spreng. pug. 11. p. 13. R o e m. i^ S c hull. II. p. 832. 

 Root perennial. Culm about 3 feet high, erect, with lateral 

 scattered branches the whole length. Leaves linear, flat, a 

 little hairy, and somewhat glaucous. Lower sheaths hairy. 

 Sfiikes 2 or 3 proceeding from each sheath, simple, consisting 

 ofaflexuous, articulate, compressed racA/«,on which the flowers 

 are arranged in a distichous manner. Spikelets alternate ; 

 abortive one terminating a compressed villous pedicel. Calyx 

 unequal, scabrous on the keel ; inferior glume distinctly awned. 

 Corolla 2-valved, membranaceous Glumes of the perfect 

 Jloiver very much acuminated, serrulate on the keel ; the in- 

 ferior one bifid. Corolla nearly equal ; valves purple ; the 

 inferior deeply parted, with a twisted awn three or four times 

 its length between the divisions ; margin hairy. Stamens 3. 

 Stigmas 2, plumose. Seed linear-oblong. 

 Hab. In dry barren and rocky soils. August. Broom-grass. 



2. A. virginlcnm L ? : culm compressed ; superior leaves 

 and slicaths smooth ; spikes short, 2 — 3 from each sheath, partly 

 concealed at the base ; rachis subterete ; abortive flower a 

 mere pedicel without valves ; perfect flower monandrous ; 

 awn straight. Sp. pi. 1482. W ill d. Spec. IV. p. 916, 

 Muhl. Gram. p. 277. P ur s h FLl. ip. 275. A. dissiti- 

 fiorum Mich. Fl.\.^. 57. E I lio 1 1 Sk. I. ^. 159. IV ill d, 

 l.c.p.9l4. Pursh\.c. Roem. <^ Schult.U. p.SM. 

 Anatherum virginicum S p r e n g. pug. II. p. R. ^ S. II. 

 p. 809. CiNN A lateralis W a 1 1. Car. p. 59. 



Boot perennial. Cul7?i 3 feet high, somewhat cespitose at the 

 base, with remote short branches towards the top. Leaves a 

 foot or more in length ; the lower ones very hairy on the mar- 

 gins and upper surface. Fascicles of Sj^i^-es partly concealed 

 in a proper sheath ; rachis pilose. Peduncle of the abortive 

 Jloret as long as the perfect flower. Valves of the fier/eci 

 /lower very acute ; the inferior with an awn nearly an inch in 

 length. .Anther linear, yellow. Seed oblong. 

 ilAB. In exsiccated swamps, 8cc. September. 



3. A. macrourum Mich.: spikes fasciculate, in dense 



lateral and terminal fastigiate panicles ; flowers monandrous; 



awn straight ; abortive floret without valves. Mich. Fl. I. 



p. 75. Willd. Spec. IV. p. 916. MuhL Gram. p. 278. 



Elliott Sk. I. p. 150. Ro em. ^ Schult. II. p. 817. 



Root perennial. Culm 3 feet high, much branched towards the 



top. -Leaf es scabrous on the margin. Sheaths hviwy. Sfiikes 



in large clustered panicles, mostly on the upper part of the 



