668 GRAMINE^E. 



ANDROPOGON, L. 



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

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

 deciduous hairs; spikes by pairs (!'-!' 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. brachystachyus, Chapm. (in Curtiss's Fascic.). 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, Curtiss). 



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

 creeping rootstocks (1-1| high); leaves (2'-5" long) widely spreading, 

 their compressed sheaths distichous, imbricated ; panicle simple, racemose 

 (4' 8' long) ; spikes single, 8wlO-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 ; palese 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 higti) 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, 1'ers. 



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 whorls 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. 



