84 TRIANDRIA. DIGYNIA. trichodium. 



late, a little spreading ; glumes nearly equal. Pursh Fl. 

 I. p. 61. Trichodium No. 4. (anonymous) Muhl. Gram,' 

 p. 62. Cornucopia altissima Walt. Car. p. 74. 



Root perennial. Culm 3 feet high, simple, slender, but firm, 

 leafy. Leaves often growing in tufts about the root, and then 

 very narrow and involute; those on the culm 6 — 8 inches long, 

 flat. Panicle purple, exsert; branches in fours or sixes, a little 

 contracted. Glumes of the calyx lanceolate, acute. Corolla 

 one third shorter than the calyx, 5-nerved. Stamens 3. Stig- 

 mas plumose. Seed linear-oblong, acuminate. 



Hab. In sandy swamps ; New-Jersey ; particularly at a place 

 called Quaker-bridge, about 31 miles N.E. from Philadelphia. 

 August. 



Pursh quotes, as a synonym of this species, the Agrostis 

 dispar of Mi chaux ; but that plant appears to be a genuine 

 Agrostis, as it has a corolla of two valves, though one of the 

 valves is very small. In the T. datum the corolla is certainly 

 but 1-valved. 



4. T. montanum*: culm cespitose, erect ; leaves invo- 

 lute-filiform, and, as well as the sheaths, scabrous ; panicle 

 capillary, lax, a little spreading ; glumes equal. 



Moot a tuft of fibres, perennial. Culm 8 inches to a foot in height, 

 gi'owing in small tufts, simple, filiform. Radical leaves 2 — 3 

 inches long, almost setaceous ; those on the culm a little longer. 

 Sheaths closed. Stipule ovate, bifid, serrate. Panicle elongated ; 

 branches in about fours, semiverticillate ; divisions trichoto- 

 mous, capillary, flexuous, hispid. Flowers in fascicles at the 

 extremities of the branches. Glumes of the calyx remarkably 

 equal, lanceolate, serrulate on the margin and keel, nerveless. 

 Corolla nearly a third shorter than the calyx, awnless, ovate, 

 3 -nerved. Stamens 3. Seed oblong, acute. 



Hab. On the summit of the Fishkill mountains. New-York. 

 July. 



Nearly allied to T. laxijlorum, but distinguished by its ces- 

 pitose habit, less spreading panicle, and equal glumes. It has 

 much affinity to T. elegans R o e m. ts^ Schult. II. p. 283. 



9. AGROSTIS. L. 



Calyx 2-valved, 1-flowered, compressed, herbaceous. 

 Corolla 2-valved, membranaceous, generally larger than 

 the calyx, often hairy at the base. Nectaries collateral. 

 Seed coated. Gen. pi. III. Nutt. Gen. I. p. 45. 

 Juss. p. 29. Roem.^ Schult. Gen. 229. P. de 

 Beaiiv. t. VI. f. 10, et Vilfa, Achnatherum, 

 Sporobolus et Aspera ejusd. Trin. Agrost. ^2>. 



Bent-grass. 



