STATE GEOLOGIST. 171 



A. striata, Michx. Oat-Grass. 



Throughout the state, excepting perhaps far southward, Isanti county, etc. (fre- 

 quent), Upham; New Ulm, Juni. 



A. Smithii, T. C. Porter. Oat-Grass. 



Isle Royale, and eastward about lake Superior, Gray's Manual; probably also north 

 of this lake in Minnesota. 



TRISETUM, Persoon. Trisetum. 



T. subspieatum, Beauv., var. molle, Gray. Trisetum. 

 North of lake Superior (common), Macoun. 



DESCHAMPSIA, Beauv. (Aira, L., in part.) Hair-Grass. 



D . csespitosa, Beauv. (A. csespitosa, L.) Hair-Grass. 



Throughout the state, excepting perhaps far southward, but infrequent. Blue 

 Earth county, Leiberg. 



[D. flexuosa, Beauv. (A. flexuosa, L.), probably also occurs in this state.] 



ARRHENATHEKUM, Beauv. Oat-Grass. 



A. avenaceum, Beauv. Tall Oat-Grass. 



New state farm, Ramsey county, Oestlund. Infrequent. 



HIEROCHLOA, Grnelin. Holy Grass. 



H. borealis, Roem. and Schultes. Vanilla or Seneca Grass. 

 Common, or frequent, throughout the state. 



PHAIiARIS, L. Canary-Grass. 



P. Canariensis, L. Canary-Grass. 



Occasionally adventive : Minneapolis, Simmons, Upham; Waterville, Le Sueur 

 county, Oestlund. 



P . arundinacea, L. Reed Canary-Grass. 

 Common, or frequent, throughout the state. 

 [Milium elf usum, L., probably occurs in this state, but has been overlooked.] 



BECKMANNIA, Host. Beckmannia. Beckmann's Grass. 



B. erucaeformis, Host.* Beckmann's Grass. 



Lapliam. Pipestone quarry (growing in the hollows of the rock, where water occa- 

 sionally stands), Lciherg. [James river, Dakota, Geyer; and north to the Saskatche- 

 wan river and Bear lake, TTateon.] Rare. West. 



*Beckmanuia, Host. Panicle racemose, contracted. Spikelets compressed, 2-flow- 

 ered, the upper floret an abortive rudiment. Glumes 2, obovate, compressed-boatshaped, 

 subcoriaceous, equal, a little shorter than the flower, pointless. Palets membranous, 

 the lower ovate, concave, acutish. mucrouate,3-nerved, the upper 2-herved, bifid. Sta- 

 mens 3. Styles 2, with elongated plumose stigmas. Scales 2, bifid, glabrous. Grain 

 free, glabrous. — A coarse perennial aquatic. 



B. ERUC/EFORMis, Host. Culnis stout, 1 to 354 feet higli, erect from an ascending 

 base, with the sheaths glabrous ; ligules elongated ; leaves linear, 4 to 8 inches long 

 and 2 to 6 lines wide, flat, acute, scabrous ; panicle 4 to 12 inches long, erect, strict, se- 

 cund, the short crowded branchlets densely flowered from the base, glabrous; spikelets 

 sessile, imbrlcately arranged in two rows, nearly orbicular, 1^4 lines in diameter, the 

 upper rudimentary floret minute, stipitate. June to September. Watson's Rep. in King's 

 Expl, of the Fortieth Parallel. 



