G68 GRAMIXE-E. 



ANDROPOGON, L. 



A. arctatUS, Chapm. Culms single (2° -3° high), the appre9sed branches 

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

 deciduous hairs; spikes by pairs (l'-H' 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. braehystachyus, Chapm. (in Curtiss'sFascic.). 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 ((J" -8" long) ; spikelets, &c, as in A. macrouras, of which it is probably 

 a marked form. — East Florida [Herb. Durand, Curtiss). 



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

 creeping rootstocks (1°-1A° 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. argenteus, 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 ; palerc unequal; stamens 3. — Old fields and open woods, 

 Florida, and northward. 



IMPERATA, Cyrill. 



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

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

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

 equal, lunar, rigid, convolute, the lower one bind, the upper one truncate : 



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



Sterile flower triandrous, linear, anile, or reduced to two setaceous spirally 



twisted pedicels. — Sandy pine barrens, East Florida. 



