r>7S CUAMINK.K. ((iKASS FAMILY.) 



T). P. conjugatum, norj^. SmoDtli ami hrancliiiit; (2^ l">"g) ; leaves 

 thill, liiioar; sjtikos 2 -.3, Hat, the two terminal ones conjugate; siiikelets 

 minute, in two rows, ovate, long-fringed. — New Orleans (Dr. Halt). 

 Introtlueetl. 



C. P. ciliatifolium, .Midix. Cnlms 1^-2° high; leaves niidulate, cili- 

 ate, smooth or hairy like the sheath.-;, .''/ - 12' long, 6"- 10" wide ; spikes 2-4 

 in a terminal raceme, or solitary and axillary, closely (lowered, 2' -4' long; 

 spikelets in pairs, roundish, T'-IA" long. — Cultivated ground, common. 

 July-lSoj)!. 



Var. dasyphyllum. Leaves and sheaths villous ; spikes mostly 3, the 

 axillary ones included; s])ikclets mostly single. (1*. dasyphvllum, /ill.) — 

 With the type. 

 •7. P. setaceum, Michx. Culms slender, l°-2° high; leaves and 

 sheaths generally villous; spikes solitary, long-peduncled, the axillary ones 

 short-pedunded or included; spikelets single, i" long. — Dry sandy soil. 

 July - Se))t. 



8. P. debile, Michx.? Mostly glabrous; culms filiform, 2° -3° high; 

 leaves 3' -G' long, 3" -5" wide; spikes mostly solitary, filiform, all on long 

 (6'- 10') setaceous peduncles, these often 2 or more from each sheath ; spike- 

 lets in pairs, ^" long. (P. lougepedunculatum, Lecoz/ie ?) — Dry sandy soil 

 along the coast, Georgia and Florida. 



9. P. monostachyum, Vasey. Glabrous; culms strictly erect, 2° -3° 

 high, sini])le ; leaves narrow, erect, rigid, convolute, the lower l°-l^°long; 

 spike solitary, erect, long-peduucled, 6' -8' long; spikelets imbricateil in two 

 rows, oblong-oval, 1^" long. — South Florida, and westward. 



* * Spikes 3-12 (rarelij 2 or numerous), in a termuuti raceme. 

 ■^ Ihirlds of the spike filiform : spikelets distinctli/jiedicelled. 



10. P. racemulosum, Nutt. Spike.s 2-3, slender, erect (4' long); 

 spikelets single or by pairs, obovate, distant on the filiform and somewhat 

 flcxuous rachis, distinctly pedicelled ; glumes smooth, obtuse, 7 nerved ; culms 

 simple, erect (2°-3°high); leaves long, linear, keeled, glaucous, sprinkled 

 with long white hairs. — Dry sandy soil, Florida to North Carolina, and west- 

 ward. August -Se])t. y.. 



■>- -^ Ildchis of the spike fiat or trianrjalar : spikelets short-pedicelled. 

 = Spikelets a line, or less, long. 



11. P. purpurascens, Fll. Annual, nearly glabrous; culms erector 

 ascending, branching, l°-3° long; leaves thin, broadly linear, 6'- 12' long, 

 the sheaths often purple; spikes 2-12 (fewer on the branches), 2' -3' long; 

 spikelets 1" long, oval or roundish, crowded in 3 -4 rows under the broad 

 rachis; glumes 5-nerved. — Low ground in the middle and lower districts. 



12. P. plicatulum, Michx. Perennial, glabrous; culms simple, slen- 

 der, 2°-3° higli ; leaves long, linear; spikes 3-5, distant, 2' long; spikelets 

 oval, in 3 rows under the narrow rachis, 1" long; second glume plicate within 

 the pale thickened margins. — Georgia, Florida, and westward. 



13. P. csespitosum, Fliigge. Culms slender, 1°-!^° high; leaves 

 narrow-linear, ciliate ; spikes 3-4, filiform, I'long; spikelets in three rows, 



