668 GEAMIXEJJi. 



ANDROPOGON, L. 



A. arctatllS, Chapm. Culms single (2°-3° high), the appressed branches 

 narrowly paniculate ; leaves and sheaths shaggy with long white, mostly 

 deciduous hairs; spikes by pairs (I'-IJ' long), rather stout, closely 15-20- 

 flowered; glumes rough, twice as long as the joints of the-rachis; pedicel of 

 the neutral flower tipped with two slender glumes; hairs of the rachis few 

 and short; stamen 1. (A. tetrastachyus, var., 1st edit.) — Low pine barrens, 

 Florida. 



A. tarachystachyus, Chapm. (in Curtiss's rascic). Culms (2° - 4° high) 

 compressed, branching from all the upper joints, narrowly paniculate ; leaves 

 linear, not hairy, rough on the margins ; spikes very numerous, by pairs, 

 short (6" -8" long) ; spikelets, &c., as in A. macrouras, of which it is probably 

 a marked form. — East Florida {Herb. Durand, Curliss). 



A. maritimus, n. sp. Smooth and glaucous; culms ascending from 

 creeping rootstocks (l°-li° high); leaves (2'-5' long) widely spreading, 

 their compressed sheaths distichous, imbricated; panicle simple, racemose 

 (4'-8' long) ; spikes single, 8 - 10-flowered, very silky; glumes equal, twice 

 as long as the stout joints, and half as long as the twisted awn ; sterile 

 flower triandrous. — Sandy coast. West Florida. 



A. argeuteus, Ell. (not of 1st edition). Smooth ; culms branching (2° 

 high); leaves long, linear; branches 1-2 from each upper joint, simple, 

 long-exserted ; spikes by pairs on the long (3' -8') stout peduncle, white 

 with dense silky hairs ; joints of the rachis rigid, as long as the hispid-serru- 

 late spikelet; pales unequal; stamens 3. — Old fields and open woods, 

 Florida, and northward. 



IMPERATA, CyriU. 



Spikelets by pairs on the slender branches of the spike-like panicle, one 

 sessile, the other pedicelled, both fertile and 2-flowered, the lower flower 

 neutral. Glumes 2, thin, nearly equal, woolly ; lower flower of one palea, 

 the upper one perfect. Stamens 2. 



I. caudata, Cyr. Culm simple (2° high) from long creeping rootstocks ; 

 leaves broadly linear (2° long), those of the culm few and short ; panicle 

 white-woolly, oblong (4' -5' long) ; flowers minute. — South Florida. 



SORGHUM, Pers. 



S. pauciflorum, Chapm. Annual; culms branched near the base (2°- 

 3° high); leaves long, broadly linear, flat, ciliate; spikelets few (6-12), 

 racemose, the long (2' -3') setaceous pedicels in wliorls of 2-6; glumes 

 equal, linear, rigid, convolute, the lower one bifid, the upper one truncate ; 

 awn very long (5' -6'), geniculate, twisted and tortuous below the middle ; 

 sterile flower triandrous, linear, acute, or reduced to two setaceous spirally 

 twisted pedicels. — Sandy pine barrens. East Florida. 



