006 GRAMIXK.l-;. ((MIASS FAMILV.) 



iiiiliricatfil in two rows on one side uf the trian;^iilar rariiis, forniing ap- 

 pres.seil or spreadinj; alternate spikes. Kinpty glumes li, uiiuiiuul, acute or 

 short-awuec], commonly hristly-serrulate on the keel ; the upper mostly longer 

 than the awnless Horct. ]'alet thin, shorter than tiie glume. Stamens 1-3. 

 Styles long, united helow, or nearly distinct. (Jraiu free. 

 * Leaves conrolutc, rush-like. 



1 . S. juncea, Wllld. Spikes 3-9, remote, erect ; upper glume 2-3 times 

 longer than the lower one; flowering glume, and sometiuies the palet, rough 

 above. — Sandy or marshy places along the coast. July -August. — Culms 

 l°-3° high. Leaves pungent. Spikes 1' -2' long. Stamens 1 -3. 



2. S. juneiformis, Engelm. & Gray. Spikes 15-30, closely imbricated 

 in a cyliiidiical spike, the lowest rather di.stinct ; up]ier glume one third 

 longer than the lower one, obtuse, mucronate ; flowering glume rough on the 

 back, the palet smooth. — Sandy saline swamps, West Fhjrida. July -Au- 

 gust. — Culms (2° -4° high) and rush-like leaves very rigid. Common spike 

 4' - 6' long. Proper spikes 4" - 6" long. 



* * Leaves concave or flat. 



3. S. polystachya, Willd. Spikes numerous, spreading ; upper glume 

 and nearly etjual tiui-et sliglitly roughened, 2-3 times longer than the lower 

 one ; leaves broad (|'- 1^'), concave, very rough on the margins. — Brackish 

 marshes, Florida to North Carolina. August -Sept. — Culms stout, 4° -S° 

 high. Spikes 2' -3' long, racemed. 



4. S. glabra, Muhl. Spikes numerous, appressed to the common rachis ; 

 upper glume linear, obtuse, 3 times the length of the lower one, glabrous ; 

 leaves concave, smooth on the margins. — Salt marshes, Florida, and north- 

 ward. August -Sept. — Culms 2° -4° high. Leaves narrower than the last, 

 elongated. 



■5. S. cynosurioides, Willd. Spikes .5-20, erect, 3' -4' long; glumes 

 awued, the upper twice as long as the lower one ; flowering glume hispid on 

 the keel ; palet smooth, obtuse. — Marshes, Tennessee. August. — Culms 3° - 

 4° high. Leaves soon convolute. 



47. GYMNOPOGON, Beauv. 



Low perennial grasses, with short and crowded distichous spreading leaves. 

 Spikelets appressed, scattered on the straight and at length reflexed branches 

 of the simple panicle, consisting of 1-3 perfect flowers and an awn-like pedi- 

 cel above. Empty glumes 2, subulate, hispid-serrulate. Floret shorter than 

 the glumes, its glume awned under the apex. Stamens 3. 



1. G. racemosus, Beauv. Culms (1° high) rigid; leaves lanceolate 

 (1 J'-2' long) ; branches of the panicle bearing the linear spikelets from the 

 base to the summit ; spikelets I-flowered ; awn 2-3 times the length of the 

 floret. — Dry sandy soil. Sept. - Oct. 



2. G. brevifolius, Trin. Culms and panicle usually more slender; 

 spikelets 1 -3-flowered ; oftener borne above the middle of the branches ; awn 

 shorter than the floret ; otherwise like the preceding. — Low pine barrens. 

 Sept. - Oct. 



