f54 TRfANDRIA. DIGYiMA. dioitaria, 



p. 84. JVutt. Gen. I. p. 58. Juss.ip.29. Roem. 

 ^ Schitlt. Gen. 266. Vanici spp. L. Trin. &c. 

 Syi^thekisma Walt. Car. p. 76. Crab-grass, 



Crop-grass^ 



1. D. sangninalis S c op. : spikes- namerous, fasciculate, 

 a little spreading ; leaves and sheaths somewhat hairy ; spike- 

 lets oblong ; florets pubescent on the margin. P er s. Syn. I, 

 p. 84. Mich. Fl.l.'p. 45, Pursh FL\.Tp.e9. Muhl. 

 Gram. I. p. 120. Elliott Sk. I. p. 121. Panicum san- 

 guinale L. Will d. Spec. I. p. 342. Eng. Bot. t. 849. B i g. 

 Bost. p. 19. Syntherisma joraecox W alt. Car. p. 76. 



Root annual. Culm 1 — 2 feet long, decumbent or assurgent, root- 

 ing at the lower joints. Leaves hairy, often undulate on the 

 margin. Sfiikes 4—6, rarely more. Rachis flexuous. Sfiikelett- 

 in pairs, arrariged in two rows, on short peduncles, closely ap- 

 pressed to the rachis J inferior fioret almost sessile. Inferior 

 glume almost wanting; superior glume lanceolate, acute,^ 

 scarcely half the length of the flowers. Abortive floret without 

 any traces of a superior valve; margin distinctly hairy. Per- 

 fect floret smooth. 



Hab. In cultivated grounds, sandy fields &c, ; very common. 

 August — October. Crab-grass. 



2. D. glabra R. ^r S. : spikes digitate, subalternate. (3 — 4.) 

 spreading ; leaves and sheaths smooth ; spikelets ovate, crovird- 

 ed ; calyx equal to the abortive floret, both hairy. Ro em, 

 ^ Schult. II. p. 471. D. humifusa Pers. Syn. I. p. 45. 

 D. Ischaemum Schreb. Muhl. Gram. p. 121. D. pas- 

 paloiUs M I c h. PL 1. p. 46. Pursh FL 1. p. 70. R. ^ S, 

 11, p. 472. Panicum glahrum Gaud. 



Root annual. Culm generally decumbent, rarely rooting at the 

 joints, about a foot long; joints smooth. Leaves short, flat, 

 sometimes with a few scattered hairs on the upper surface. 

 Spikes seldom more than 3, about two inches long, much 

 spreading. Calyx of oha glume, (inferior glume wholly want- 

 ing,) villose. Valve of the abortive floret 5 -nerved, hairy, but 

 less so than the calyx. Perfect floret acute, smooth, finely 

 striate. 



Hab. In sandy fields; common near New-York. In Penn- 

 sylvania. Muhlenberg. August*— September. 



This species very much resembles the precediug, but is 

 easily distinguished by the characters given al>ove. I have com- 

 pared the^ North-American plant with specimens from Swe- 

 den and Germany, and find them to agree in every respect. 

 Mr. Elliot t refers the D. fiasfialodes of Mic/iauxj 

 to his Milium fiasfialodes, which is the M. distichum of 

 Mu hie n be rg. 



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