Agrostis.'] GRAMINEJE, 



239 



subdistichis angustis involutis tenuissime elongatis, paniculis elongatis angustissimis ex- 

 sertis, glumis subsequalibus acutissimis carina scabris unifloris absque rudiniento^ pe- 

 rianthii exserti valvula exteriori paululum longiore trinervi ciispidata. 



Hab. Banks of the Saskatchawan, near the Rocky Mountains. Dnimmond. Plains of the Red River. 

 Douglas. — ^Mr Drummond's specimens are named V, cuspidata by Dr Torrcy, and considered by him a new- 

 species. Its nearest affinity is with V. vagiiiijiora, Torr. (in Gray, Gram, et Cyp. Part L n. 3 J and P. 

 involuta, Torr. (« Gray, Gram, et Cyp. L c. n, 4.) ; the foliage and habit bearing a considerable resemblance, 

 but the panicle is much elongated, the flowers smaller, more rigid, and considerably dillereut in structure.^— 

 V. clandestina {Spr.j and Torr. Fl. p. 90), agrees with this in so many respects, that I am not sure that 

 they are really distinct ; but my authentic specimens of T. clandestina are in a very imperfect state. 



2, V, tenacissima. H,B,K, — Trin, Gram. Ic, L 60. Sporobolus. Beauv. — Agrostis. 

 Jacg, ^.fuscicolor ; paniculse ramis longioribus glumis valde inaiqualibus. 



Hab. /3 Common on Menzies' Island, N. W. America, and on the higher parts of the Columbia River. 

 — There is only one specimen of this plant, which may probably prove distinct from that to which I have 

 referred it. The culms and foliage sufficiently accord, however, and the panicle is very similar ; but the 

 branches are longer, the flowers rather larger, more deeply coloured and brown, and the valves of the calyx 

 (or glume) very unequal. Indeed in the United States specimens of the true F. tenacissima, I find the calyx 

 valves much more unequal than is represented in the figure of Trinius, or described in Dr Torrey's Flora. 



18. AGROSTIS. Z. 



1. A, alba, L. E, BoL t. 1 IS9. — /V/. — Torr, FL />. 85. — var ? valvula flosculi e medio 

 dorso selisera. Nees. in Herb, nostr, 



Hab. var. Moist ground and banks of streams near the confluence of the Columbia River. Douglas. — 

 Certainly this plant has so exactly the appearance of our well-known Agrostis alba, that we hardly dare 

 venture to consider it distinct, although the back of the valve of the corolla constantly bears a slender awn 

 rather longer than the flower, and very conspicuous. The valves of the glumes too are vcr^' rough on the 

 keel. — The European A, alba has sometimes a short awa from the corolla. 



2. A. vulgaris, Sm. E, BoLt 1671. — Ph, — Torr. Fl.p.Sb. — A. polymorpha. Huds. 

 Gray^ Gram, et Cyp. Fart II, n. 108, 



Hab. Common on banks of streams, N. W. Coast. Douglas, Observatory Inlet. Dr Scouler, 



3. A, exarata (Trin.) ; radice fibrosa, culmis erectis simplicibus vaginisque sulcato- 

 striatis et glabris, foliis linearibus acuminatis planis retrorsum scabris, panicula ramosa 

 erecta contractaj ramis semiverticillatis adpresso-erectis hispidis, glumis acuminatis 

 carina denticulatis florem muticum dupio superantibus, superiore paulo breviore. Zrz/z. 

 Gram. Unifl. 205. Ejusd. Ic. t. 27. Bong. Veg. de Sitcka, p. 52 — 0. iniiior ; periantbio 

 univalvi. A. Drummondi, Torrey, mst, 



Hab. Unalaschka. Chamisso. Sitcha. Bongard.^d. Valleys of the Rocky Mountains, on the east and 

 on the west side of the dividing ridge. Drummond. Douglas.— '^he var. i3. is probably a distinct species ; 

 but knowing how sportive are the flowers of several species of Agrostis, I prefer considering it a var. of A. 



