592 CiUAMTNK.T:. (CHASS FAMILY.) 



glumes hispid above ; sterile Hower 3-an(lroiis. (AiiilrDpogoii Nuttallii, Flora.) 



— Low pine liarreiis, Florida and the lower distritts of Cieorgia. Sept. — 

 Spikes 3' -6' long. 



21. ANDROPOGON, L. Broom Ghass. 



Coarse perennial grasses, with brauchingerect culms, long and harsh leaves, 

 aud spiivcd inflorescence. Spikes lateral aud terminal, jointed. Spikelets by 

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

 them pedicolk'd and stamiuate, neutral, or rudimentary ; tlie other sessile, 1- 

 flowered, and fertile. Glumes 4, the lowest coriaceous, tlie 2 upjjer hyaliue, 

 tlie 4tli aud Howeriug one awued. Stameus 1-3. 



* Spllcps solitary : sterile Jiowers stamlnate or neutral. 



1. A. Oligostachyus, Chapm. Culmssimple, rigid, erect; leaves linear, 

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

 with short spreading iiairs; lower glume pubescent, -J - J as lung as the con- 

 torted awn ; sterile flower neutral, short-awned. (A. hirtiflorus, A'unM ?) — 

 Dry saud 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 })earded at the apex. — Dry grassy pine barrens, Georgia, Florida, 

 and westward. Sept. — Culms 2° -3° long. Spikes slender, \'-2' long. 

 Upper leaves short, bearded at the throat. 



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

 single, or in unecjual pairs; leaves linear, glaucous ; spikes 2' -3' long, short- 

 peduncled, 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 

 ( Garter). 



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

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

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

 With the preceding ( Garher). 



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 V-2' long. 



6. A. maritimus, Chapm. Culms erect from the creeping base! short- 

 jointed, the short br.inches 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 triandrous. 



— Drifting sand along the coast. Sept. — Culms l*-li° high. Leaves3'-6' 

 long. 



