594 fJUAMINE.K. (dUASS FAMILY.) 



r loiij^, 8 - loHowort'd. — Wet jiiiie barifiis, l-lurida. — Culm and lenvcs 

 purpli'. 



Var. vaginatUS. (A. vaginatns, FJI. lli:rb.\) Brac-ts bniad, ouclosiiig 

 the spikes. 



1."$. A. Mohrii, Hackcl. (ulins stout, 3°-4° hi<,'h, tlie liraiulies short 

 and rigid ; leaves and sheaths woolly ; spikes 4-7, rigid, 1'- IJ' long, 7- 10- 

 tlowcred ; glumes 2" long, hispid-serrulate ahuve, as long :is the pedicel of the 

 awn-like sterile Hower ; awns 8" long. (A. tetnistaehyus, /7or«.) — Around 

 jiiiie harren ]>oiids. West Florida and South Alai)aina. Sept. -Oct. 



14. A. brachystachyus, Cliai)iii. Culms strictly erect, 4° -5° high, 

 the short and slender branches mostly in pairs, forming a loo.se narrow ])anicle 

 2° -3° long; leaves linear, glahrous like the sheaths ; .spikes in pains, \' long, 

 6- 8-flowered,as long as the hracts ; glumes 1^" long, twice the length of the 

 joints of the slender rachis, and nearly as long as the awn ; sterile flower 

 none. — East Florida ( t'urtiss). 



15. A. macrourus, Michx. Culms firmly erect, 3° -5° high; leaves 

 and sheaths scabrous, and often villous ; panicle 1"- 2° long, coni])oscd of ex- 

 cessively numerous crowded branches; spikes in pairs, loosely 6- 8 flowereil, 

 exceeding the bracts ; glumes \ longer than the slender joints of the thinly 

 villous rachis; sterile flower minute; awn 6" long. — Low ground, common. 

 — Upper branches mostly bearded below the joints. 



^'ar. corymboSUS is a reduced form of the preceding, the sim]>Ie culm 

 (l°-2° hisili) licariiig a single corymbose 1-sided panicle. — Wet pine barrens. 



Var. glaucopsis. Ell., is a more slender smooth aiid glaucous form, with 

 more oiieii iiiHorcscence, and bracts longer than the spikes. — Pine barren 

 swam])s. 



Var. ? viridis, Chapm. Culms 3° -4° high, loosely paniculate with long 

 slender branches ; leaves and sheaths smooth or hairy ; bracts longer than the 

 scattered spikes. — Low pine barrens near the coast, Florida. 



» * * Spikes 2-5 at the summit of the culm, and 1 -3 on the branches, rigid, 

 not villous, the rachis and pedicel of the triandrous awnless sterile flower 

 frinqed n-ith scattered hairs, and short-bearded at the base. 



16. A. f urcatus, Muhl. Culm stout, rigid, 3°- .5° hiirh ; leaves rough, 

 fringed at the base ; branches commonly 2 at each upper joint ; spikelets ap- 

 pressed ; glumes hispid on the nerves, half as long as the bent awn. — Open 

 woods and margins of fields. Sept. — Spikes compressed, 2' -3' long. 



22. HETEROPOGON, Pers. 



Spikes solitary or digitate. Spikelets l-fluwered, in pairs, the 2 -7 lower 

 pairs staminatc or neutral, awnless, short-pedicelled, the 2 upper sessile, one 

 fertile and long-awned,the other sterile and awnless. Otherwise mainly as in 

 Anuropogon. 



1. H. aeuminatus, Trin. Culms 4° -8° high, branching above, the 

 uppermo.st bvauclies denselycorymbo.se; leaves long, linear, the uppermost, 

 like the lower glume of the sterile spikelets, pitted along the miduerve ; 

 spikes long-peduucled, shorter than the slender bracts ; lower spikelets tri- 



