GRAMINE^. (OUASS r.VMILV.) 571 



3-nervcd, more or loss pubescent ; culms diffuse, creeping ; leaves flat, glaucous, 

 rough a'love, and, like tiic sheaths, smooth or hairy. (P. tiistachyum, L(conte'f) 

 — Swamps and low grounds, Florida to North Carolina, and westward. Aug. 

 and Sept. y. — Flowering stems 1° high. 



6. P. praeCOX, Walt. Spikes 3-6; spikelets by pairs, in 3 rows, orbicu- 

 lar, compres.xed, as wide as the straight and flat rachis ; glumes smooth, 3-nerved, 

 often di.-^colored ; culms erect (3° -4° high), simple; leaves long and narrow; 

 sheaths purple, smooth or hairy. — Pine-barren swamps. May and June. Ij.. 



7. P. laeve, Mich.\. Spikes 3-5, long (3' -4') and slender; spikelets 

 single, in 2 rows, orbicular, wider than the flexuous raeliis ; glumes smooth and 

 even, 5-nervi'd ; culms simple, erect (3°-4° high); leaves (deep green) and 

 sheaths .>;moot!i, or the latter hairy. — Dry woods and margins of fields, Florida, 

 and northward. July and Aug. y. — Spikelets 1~^" long, larger and thicker 

 than the last. 



8. P. Floridanum, Michx. Spikes 2-3, thick, erect; spikelets large (2" 

 long), mostly in 3 rows, broadly oval, tumid, wider than tlic flexuous rachis; 

 glumes smooth, 5-nerved, more or less rugose; culms rigid, erect (2° high); 

 leaves narrow, rigid, and, like the sheaths, rough-hairy. (P. macrospcrmura, 

 Fliifrjge.) — Damp soil, near the coast, Florida. Aug. and Sept. Ij. — Plant 

 glaucous. 



9. P. raeemulosum, Nutt. Spikes 2-3, slender, erect (4' long) ; spike- 

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

 racliis, distinctly pedieelled ; glumes smooth, obtuse, 7-ncrved ; culms simple, 

 erect (2°-3° high); leaves long, linear, keeled, glaucous, and, like the sheaths, 

 sprinkled with long wliitc hairs. (Panicuni Alabamense, IVin.) — Dry sandy 

 boil, Florida to North Carolina, and westward. Aug. and Sept. 1|.. 



10. P. undulatum, Poir. Spikes 2-12, spreading (2'-3'long); spike- 

 lets small (1" long), oval or roundish, crowded in 3-4 rows under the broad 

 and flat rachis ; glumes smooth, 5-ncrved ; palea; of the neutral flower often ru- 

 gose ; culms erect or ascending, mostly branching ; leaves decj) green, broadly 

 linear, flat, mostly fringed on the margins or near the base, and, like the smooth 

 or hairy sheaths, often purple. (P. purpurasceus, Ell. P. plicatulum, Michx. 

 P confertum, I^conte. P. Boscianum, Flueqge.) — Low cultivated grounds, Flor- 

 ida to North Carolina. Sept. ® — Culms |^° -3° high. 



11. P. Blodgettii, n. sp. Spikes 4, filiform; spikelets minute (J" long), 

 in 3 rows, elliptical, as wide as the straight rachis ; glumes 3-nerved, minutely 

 pubescent and granuhu"; culms tufted, simple, erect (I°-l^° high) ; leaves flat, 

 fringed on the margins. — Key West, Dr. Blodtjett. 1J. — Spikes 1' long. 



12. P. ciliatifolium, Michx. Spikes slender, mostly solitary, rarely 2- 

 3, on long lateral and terminal peduncles, of which 2-3 often project from the 

 upper sheath ; spikelets orbicular, in 2 - 3 rows, wider than the naiTow flexuous 

 rachis; glume 3-nerved, commonly pubescent; culms tufted (l°-2° long), erect 

 or spreading, simple or branched ; leaves 2" -9" wide, flat, wavy and fringed on 

 the margins, or, like the sheaths, hairy all over. (P. setaccum, and P. debile, 

 Michx. P. dasyphyllum, A7/ , ^c.) — Wet or dry soil, very common. June- 

 Sept. ® and U- 



