26 TWELFTH ANNUAL REPORT. 



SISYMBRIUM, L. Hedge Mustaed. 



S. officinale, Scop. Hedge Mustard. 



A common or frequent weed through the south half of the state. 



S. Thaliana, Gay. Mouse-ear Cress. 



Minneapolis, Winchell, Miss Butler. Rare. 



S. canescens, Nutt. Tansy Mustard. 

 Frequent, or common, throughout the state. 



S. canescens, Nutt., var. bracliycarpuin, Torr. & Gray.* 

 Red river valley, Dawson. North. 



BRASSICA, Tourn. Mustard. 



B. Siimpistrmn, Boiss. Charlock. Field Mustard, 



A common or frequent weed in grain-fields throughout the state ; so troublesome 

 in the Red river valley and southwestward that farmers allowing it to go to seed are 

 subjected to a penalty by law. 



B. alba, Gray. White Mustard. 



Lake City, Miss Manniiia; Goodhue county, Sandherg; Blue Earth county, Lei- 

 berg; Stearns county, Garrison. Rare. 



B. nigra, Koch. Black Mustard. 



A common or frequent weed through the south half of the state. 



B. campestris, L.f Kale. 



Common in fields in Manitoba and around Winnipeg, Macoun; doubtless also in 

 the Red river valley in this state. 



DRABA, L. Whitlow-Gkass. 



D. arabisans, Michx. WLitlow^- Grass. 



North shore of lake Superior, J»?rt. Infrequent. North. 



D. neniorosa, L., var. hebecarpa, Liodb. (D. nemoralis, Ehrh.) 

 About Rainy lake, Drummond (Macoun). North. 



Erysimum parviflorum, Nutt. (E. lanceolatum. Hook.) Canescently scabrous 

 with an appressed 2-parted pubescence ; stem low (about a foot high) and nearly 

 simple; leaves remarkably narrow, all linear or somewhat lanceolate, almost wholly 

 entire, densely clustered at the base of the stem ; siliques long, erect ; stigma emargin- 

 ate ; flowers small, sulphur yellow; claws of the petals longer than the calyx. Distin- 

 guished from E. cheiranthoides by its more pubescent leaves, [longer] siliques and 

 larger flowers. Torrey and Gray's Flora of N. A. 



*SisyMBRiuM canescens, Nutt., var. brachycarpum, Torr. & Gray. Lobes of the 

 leaves somewhat acute, and, with the stem, furnished with minute stipitate glands ; 

 petals rather longer than the calyx ; siliques scarcely attenuate at the base, somewhat 

 longer than the pedicels. Torrey and Gray'f Flora of N. A. 



iBrassica campestris, L. Annual weed in cultivated fields and waste places ; stem 

 VA to 3 feet high, with a few scattered, reversed hairs below ; leaves somewhat fleshy 

 and glaucous, lower lyrate-dentate, subciliate,3to7 inches long, one-third as wide, the 

 upper ones smaller, entire witli rounded clasping lobes at base, tapering to an obtuse 

 point ; raceme l to 2 feet long ; sepals erect, spreading ; corolla yellow, 4 to 5 lines in 

 diameter; siliques lU inches long, with the style '/i inch; seeds small, dark brown. 

 Wood's Class-liooh. 



