cENCHRus. TRIANDRIA. MONOGYNIA. 69 



New-York. Common in the pine-barrens of New-Jersey. In 

 Pennsylvania. Muhlenberg. August. 



/3. tribuloides* : spikes and nnargins of the sheaths white, 



pubescent. C. tribuloides L. Sp. pL 1489. Willd, Spec. 



\. p. 317. Mich. Fl. I. p. 61. Pursh FL I. p. 60. 



Elliott Sk. I. p. 93. t. 4. f. 3. Muhl. Gram. p. 52. 



Roem. 4' Schult. II. p. 253. C. capitulis spinosis to- 



mentosis. Gron. Virg. 122. 



jC«/OT a foot or a foot and a half high, compressed, smooth. 

 Leaves linear-lanceojate, condupiicate, a little roughened 

 above. Sheaths dilated, open. Racemes 10 — 14-flovvered; 

 rachis angular, hairy. Invoiucrum split on one side, hairy, in- 

 cluding about 2 spikelets, each 1 — 2-flowered. Calyx, co- 

 rolla, Sec. as in the preceding. 

 Hac. In the sand on the sea-coast and near the mouths of rivers. 

 August. 



After a careful examination of the Cenchrus of our sea- 

 coast (which is doubtless the C. tribuloides) with the common 

 species of the pine-barrens of New-Jersey, and which all our 

 botanists call C. echinacus, I can find no specific difference be- 

 tween them ; the only discrepancy being the white pubescence 

 on the spikes and margins of the sheaths. 



43. SPARTINA. Schreb. 



Fbxvers in unilateral spikes, imbricated in 2 rows. 

 Calyx 2- valved, compressed, unequal. Corolla 2-valved, 

 awnless, unequal. Nectaries collateral. Gen. pi. 98. 

 Tr i n. Agrost. 37. P.de Beau v. \. c. p. 25. t. VII. 

 f. 6. Roem. ^ Schult. Ge?i. 203. Trachyng- 

 TiA Mich. Fl. I. p. 64. LiMNETis P ers. Syn, 

 I. p. 72. Nutt. Gen. p. 38. Dactylis Lin, 

 Nat. Ord. Gr amines Juss. Marsh-grass, 



\ . S. cynosuroides Willd.: spikes numerous, (10 — 40,) 

 pedunculate, panicled, spreading; leaves broad, flat, at length 

 convolute ; calyx with a short awn on one of the glumes ; 

 style 2-cleft at the summit. Willd. Enum. hort. Berol. I. 

 p. 80. Big. Bost.Tp.\6. Roem. <^ Schult. W. p.26l. 

 ?i. polystachya Muhl. Gram. p. 53. Trachynotia cyno- 

 suroides e.i polystachya M i c h. Fl. I. p. 64. Limnetis cyno- 

 suroides et polystachya P e r s. Syn. I. p. 72. Purs h FL I. 

 p. 59. Dactylis cynosurQides Sp.pl. 104. Ait. Kcw. I. 

 p. 103. Walt. Car. p. 77. Willd. Spec. I. p. 407. Gra- 

 men maritimum, &c. Gron. Virg. 135. 



Rool perennial. Culm 4 — 9 feet high, an inch in diameter at 

 the base, erect, terete, fistulous. Leaves 2 feet long, 4—- S 



