592 GBAMINE^R. (GRASS FAMILY.) 



glumes hispid above ; sterile flower 3-audrous. (Andropogon Xuttallii, Flora?) 

 Low pine barrens, Florida and the lower districts of Georgia. Sept. 

 Spikes 3' -6' long. 



21. ANDROPOGON, L. BROOM GRASS. 



Coarse perenuial grasses, with branching erect culms, long and harsh leaves, 

 and spiked inflorescence. Spikes lateral and terminal, jointed. Spikelets Im- 

 pairs on each joint of the slender commonly hairy or plumose rachis ; one of 

 them pedicelled and stamiuate, neutral, or rudimentary; the other sessile, 1- 

 flowered, and fertile. Glumes 4, the lowest coriaceous, the 2 upper hyalii.e, 

 the 4th and flowering one awued. Stamens 1-3. 



* Spikes solitary : sterile flowers staminate or neutral. 



1. A. oligOStachyus, Chapm. Culms simple, rigid, erect; leaves linear, 

 smooth, glaucous; spikes 3-4, on short mostly included peduncles, hoary 

 with short spreading hairs; lower glume pubescent, -^ as long as the con- 

 torted awn ; sterile flower neutral, short-awned. (A. hirtiflorus, Kunth 1) 

 Dry sand ridges, Middle Florida. August - Sept. Culm 2 - 3 high. Spikes 

 2' -3' long. 



2. A. tener, Kunth. Culms filiform, like the smooth soon involute 

 leaves ; spikes terete, with the joints bearded at the base, otherwise smooth ; 

 spikelets appressed, half as long as the bent awn ; pedicel of the awnless neu- 

 tral flower bearded at the apex. Dry grassy pine barrens, Georgia, Florida, 

 and westward. Sept. Culms 2-3long. Spikes slender, l'-2' long. 

 Upper leaves short, bearded at the throat. 



3. A. semiberbis, Kunth. Culms branching, 2 -4 high, the brandies 

 single, or in unequal pairs; leaves linear, glaucous ; s;iikes 2'- 3' long, short- 

 peduucled, the pedicel of the short-awned sterile flower bearded on one side ; 

 awn of the perfect flower twice as long as the glumes. Miami, South Florida 

 ( Garber). 



4. A. gracilis, Spreng. Culms branching above, 1-1| high; leaves 

 very narrow ; pedicels villous at the top, long-exserted from the filiform leafless 

 bracts; spikes 1^' long, few-flowered ; glumes smooth, the 4th long-awned. 

 With the preceding (Garlier). 



5. A. SCOparius, Michx. Leaves smooth or hairy ; spikes numerous, on 

 exserted peduncles, the slender flexuous rachis, and pedicel of the awned or 

 awnless staminate or neutral sterile flower fringed with spreading hairs ; per- 

 fect flower half as long as the awn, the glumes often roughened with ele- 

 vated points. --Dry sterile soil. August- Sept. Culms 2-3 high, the 

 branches clustered. Spikes l'-2' long. 



6. A. rn.aritirn.US, Chapm. Culms erect from the creeping base, short- 

 jointed, the short branches mostly single ; leaves mostly reflexed ; the lower 

 sheaths compressed and imbricated ; spikes few, partly enclosed, very villous ; 

 glumes 4"- 5" long, half as long as the twisted awn ; sterile flower triandrmis. 



- Drifting sand along the coast. Sept. Culms 1 - H high. Leaves 3' - 6' 

 long. 



