tRiandrta. digtma. 73 



I'ciTiarkabl}- naked, rather compressed, asperate above, 

 with 3 or 4 broad flat leaves near the ba-e, from 3 to 4 

 feet high, terminatins" in an ahnost simple, few-flowered 

 raceme. Leaves about a foot and a lialf long", near three 

 quarters of an inch wide, with the sheath a little pubes- 

 ceMt. Spikelets compiessed, flowers divaricate- Calix 

 extremely unequal, valves scute, 2 to 5-flowered. Exte- 

 rior valve oi' the corolla some v/hat coriaceous, and much 

 longer than tiie cali.x; inner valve much shorter than the 

 outer. Seed partly coated, with an indurated, cartilagi- 

 nous arillus. — Considerably allied to Umola gracilis. 8. 

 graiidifora 9. fnituns 10. Po<eoides. 11. Unioloides. 12. 

 nvtan^ 13. parrifora, F.llio rr. 



The genus Festiica is almost pecidiar to Europe and 

 Nortii America; a few species exist m Barbary, (Africa) 

 and inNortiiern Asia. 



102. BROMUS. L. (Brome-grass.) 



Cal'ix 2-valved, many fl«>\vere<j. Spikelets ob- 

 long, disticlial. Outer vaives of tl»e rorolla of- 

 ten bifid at the point, and awned below the 

 sum. nit; interior .^Imne pectinately ciliate. 



The habit of this genus is entirely similar to the pre- 

 ceding; the spikelets are, lu.wc ver, generally more or less 

 terete and tumid; the valves of the corolla often furnished 

 with a scariose margin, and m tiie in;iei valve, tlie flexures 

 of the nerves are ciliate; in many species the panicle is 

 nntant, and in some the seed so large as to have been 

 cultivated for the use of horses and other cattle. 



Species. 1. B.secaUnun. 2. mc///s, (''Oth introduced) 3. 

 piirpcanfi. In this species, the leaves, which are alternate, 

 approach so near to each oiher as to appear almost disti- 

 clial. 4:. ciliatus. 5. altissimus, Pursh. Near Fort iVIan- 

 dan, on the .Missouri, very large; scaicely distinct from the 

 Ji. canadensis of M i c h a t x' 



This genus is chieflv confined to Europe, and Barbary 

 in Africa, there are also, 2 species in South America. 



103. DACTYLIS. L. (Orrhard-grass.) 



Calix 2-valved, many-flovvered, compressed, 

 one of the valves larger, arid ("aiinate, some- 

 what awned. Corolla 2 valved. — Spikelets ag- 

 gregate and capitate. 



Species. 1. D. glomerata. (Introduced.) 



