574 GRA5IINEJE. (gKASS FAMILY.) 



glumes long-pointed, the upper 7-nerved, one third longer than the obtuse per- 

 fect flower ; sterile flower 3-androus. — Sandy soil, Florida, and northward. 

 Aug. and Sept. 1|, — Culms several in a cluster. Leaves smooth, flat (green), 

 1° or more long. Glumes purplish. 



10. P. amarum, Ell. Glaucous; culms stout; branches of the slender 

 contracted panicle smooth, appressed ; leaves long and rigid, soon convolute ; 

 spikelets ovate-lanceolate (2" long), short-stalked ; upper glume pointed, strongly 

 7-nerved, one third longer than the oblong obtuse perfect flower, and equalling 

 the 3-androus sterile flower. — Drifting sands along the coast, Florida, and north- 

 ward. Sept. IJ. — Plant salt and bitter to the taste. 



U. P. fasciculatum, Swartz. Smooth; culms erect (1° high), branch- 

 ing ; leaves membranaceous, linear-lanceolate ; panicle contracted, 3' - 4' long, 

 with the mostly simple branches erect ; spikelets deep green, obovate, acute ; 

 glumes smooth, the upper one strongly 7-nerved and reticulated, 2-3 times as 

 long as the lower one, barely longer than the tumid rugose perfect flower; sterile 

 flower neutral. (P. fuscorubens, Lam.) — South Florida. Oct. H. 

 -I- t- Sterile flower of one paka, neutral. 



12. P. proliferum, Lam. Smooth; culms thick and succulent, ascending, 

 branched, geniculate ; panicles lateral and terminal, diffuse ; spikelets lanceolate- 

 ovate, acute, somewhat crowded on the straight branches ; upper glume 7-nerved, 

 3-4 times as long as the lower; perfect flower pointed. (P. geniculatum, Jl/u/i/.) 

 — Wet places near the coast, Florida, and northward. Sept. (X) — Culms 1°- 

 3° long. 



13. P. capillare, L. Culms erect, simple or branched; leaves and sheaths 

 hirsute ; panicles lateral and terminal, the very slender branches at length re- 

 flexed ; spikelets lanceolate-ovate, scattered on long and capillary pedicels ; 

 upper glume 5-nerved, pointed, twice as long as the lower; perfect flower obtuse. 

 (P. strigosum, Ell. 1) •— Sandy fields, Florida, and northward. Sept. (J) — 

 Culms l°-2° high. 



14. P. divergens, Muhl. Culms slender, fragile, sparingly branched ;• 

 leaves subulate, rough on the upper surfiice and margins ; the smooth sheaths 

 longer than the joints ; panicle diffuse, bearded at the axils ; spikelets small, 

 spindle-shaped, solitary at the summit of very long (2' -4') and rough pedun- 

 cles ; lower glume minute ; perfect flower lanceolate-oblong, acute, nearly as 

 long as the upper glume and neutral palea. (P. autiimnale, Bosc.) — Dry sandy 

 soil, South Carolina, and northward. Aug. 1^ — Culms 1° high. Leaves 2' - 

 4' long. 



15. P. verrucosum, Muhl. Smooth; culms very slender, branched; 

 leaves linear-lanceolate ; panicles terminal, pyramidal, the slender scattered and 

 often simple branches spreading ; spikelets obovate, obtuse ; glumes obtuse, 

 roughened with fine warts, the upper one at length shorter than the perfect 

 flower, the lower minute. — Swamps, Florida, and northward, Sept. 1|. — 

 Culms 2°- 4° long. Spikelets ^" long. 



16. P. angUStifolium, Ell.' Culms weak, difFusely branched; leaves 

 linear ; panicle simple, the few elongated and Scattered branches bearing 2-4 



