50 TRIANDEIA, DIGYNIA. 



to PhaJans; its habit is that of Cri/psis. To Jlgrostis it has 

 no afiinity whatever. 



Of this genus there are only 2 other species, the 

 C. acnleata, comrrion to the south of Burope and Bar- 

 bary, and like the C. sqnarrosa annual The 2d spe- 

 cies, C Schoenoides, grows in Italy, the sovith of France, 

 Spain and Smyrna. These 2 species are nearly related to 

 the genus Phleiim. I'he C. sqnarrosa in the structure of 

 the corolla glume, appears nnuch more nearly allied to the 

 genus Cenchrus. 



76. PHLEUM. i. (Cat's-tail Grass. Timothy- 

 Grass.) 



Calix S-valvcd, 1 -flowered, valves linear with 

 a retuse jioitit, prominently carinate, earh ter- 

 minating in a cnsp (or short awn). Corolla in- 

 cluiled within the calix. 



Flowers in dense cylindric spikes, simple, or partially 

 divid: d, calix indurati-d, generuliy rough, ciliatc or his- 

 pid, flat and truncate, with the mid-rib going out into a 

 shortish awn. 



Species. \.P. pratense- (Introduced, now naturalized in 

 the United States, and of great importance in agricuhuie.) 

 Tiie few species of this genus {7) ."re all natives of F.u- 

 rope, w ith the excejiiion of the P. dentatum of the Cape 

 of Good Hope, which evideialy belongs to some other 

 genus. 



77. POLYPOGON. Desfontaines, 



Calix 2-valved, 1 -flowered, each of the valves 

 awned. Corolla 2-valved, slioi'ter than the calix, 

 the extcri<n' valve terminating in an awn. 



Culm simple or branched, flowers in spiked panicles, 

 awns of the calix long and straigia (being properly aa 

 elongation of the midrib,) awn of ihe corolla slender, 

 also terminal and erect. 



Species. 1. P crhutnm? {Phlewn criniti/m, Smith.) The 

 PJueum described by Air. Elliott, must either be this 

 plant, or a new species, as he describes tlte -pike to be 

 Compound, and the mid-nb of the caiix extend d into an 

 awn twice its length with a corolla " much smaller than 

 the calix." Mr. E. found it upon SullivAts's shind, appa- 

 rently n.aturalized, and not niore 'ban 6 to 10 ii.ciies high 

 Of the P. pratense, Sir J. E. Smitii, in Flor. Brit, sa} s' 



