STATE GEOLOGIST. 161 



A. canina, L. Brown Bent-Grass. 

 Pipestone county, Leiberg. Rare. 



A, vulg-aris, With. Red-top. Herd's-Grass (-^f Pennsylvania, &c.) 



Probably native nortliward ; also much cultivated, and thence often spontaneous, 

 throughout the state. (A.ccording to Dr. Oeorge Thurber, in the Botany of California, 

 this should be called a variety of A. alba, L.) 



A. vulg-aris. With., var. allba, Vasey. (A. alba, L.) Fiorin. White 

 Bent-Grass. 

 Earasey county, Oesthmd ; Red Wing, Sandberg ; Blue Earth county, Leiberg ; New 

 Ulm, Juni. [Lake Superior, Whitney.] 



CIIS'N'A, L. Wood Reed-Grass. 



C arundinacea, L. Wood Reed-Grass. 



Throughout the state. LapTiam. Upper Mississippi river, Houghton ; Blue 

 Earth county, Leiberg. 



C. pendula, Trin. (C. arundinacea, L., var. pendula, Gray.) Wood Reed- 

 Grass. 

 Lake Superior and northward, Gray's Manual; doubtless in northern Minnesota. 



MUHLENBERGIA, Schreber. Drop-seed Grass. 



M. sobolifera, Trin. Drop-seed Grass. 

 Lapham. South. 



M. glomerata, Trin. Drop-seed Grass. 



Common, or frequent, throughout the state; not confined to wet places, but often 

 growing on dry and even sandy ground ; abundant south westward, frequently persisting 

 as a plentiful weed in wheat-fields and other cultivated land, Upham. 



M. g'lomerata, Trin., var. ramosa, Vasey, ined. Drop-seed Grass. 



Minneapolis (bluff of Mississippi river near the University), Upham; probably the 

 prevailing form of the species in this state. [Much branched from the base upward, 

 the lateral branches slender, naked above, very leafy ; outer glumes only slightly 

 longer to one-third longer than the flower ; flowering glume sparingly villous. Minne- 

 sota, Dakota and Utah. Letter of Dr. Vasey, Sept. 30, 1884.] 



M. Mexicana, Trin. Drop-seed Grass. 



Ramsey county, Oestlund ; Blue Earth county, and southwestward (common), Lei- 

 berg ; Pembina, Havard. 



M. sylvatica, Torr. & Gray. Drop-seed Grass. 



Lapham. North of lake Superior, Agassiz. Probably throughout the state. 



M. WilldeDOvil, Trin. Drop-seed Grass. 



Through the south part of the state. Lapham. Blue Earth county, Leiberg. 



M. ambigua, Torr,* Drop-seed GrasF. 



Stony banks of Okaman lake (lake Elysian), Waseca county, Oeyer. 



*MuHLENBERGiA AMBiGUA, Torr. Panicle dense, opiciform ; glumes rather 

 unequal (the inferior one shorter), linear-lanceolate, very acute, 1- or 2-flowered, very 

 hau'y at the base ; superior valve [palet] with a bristle at the tip equalling it in length, 

 a little shorter than the glumes (exclusive of the awns) ; superior floret either perfect, 

 and then resembling the inferior, or rudimentary and aristiform. . . . Culms csespi- 

 tose, about 154 feet high, glabrous ; leaves broadly linear ; stipules very short, truncate 



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