28 TWELFTH ANNUAL REPORT. 



THLASPT, Tourn. Penntcress. 



T, arvense, L. Field Penm/cress. Mithridate Mustard. 



Lapham. Pembina, Hazard. "Abundant on the Red river near the older set- 

 tlements" [in Manitoba]; "not yet common as far south as the forty-ninth parallel, but 

 rapidly spreading. A most noxious weed." Dawson. 



JLEPIDIUM, L. PEPrEiiwoRT. Peppergrass. 



Li. Virginicnm, L. Wild Peppergrass. 



Common, or frequent, throughout the state, excepting perhaps northward. 



li. iiiterinediiini, Gray. Wild Peppergrass. 



Abundant (petals usually wanting) throughout the state. Both species are native 

 weeds. 



CAKILE, Tourn. Sea-Rocket. 



C Americana, Nutt. American Sea-Rocket. 



"Abundant on the sandy south shore" of lake Superior, Whitney; at Thunder bay, 

 Macoun; doubtless also on the shore of lake Superior in Minnesota. 



CAPPARIDACE^. Caper Family. 



POLANISIA, Raf. Polanisia. 



P. graveolens, Raf. Heavy-scented Polanisia. 



Common through the south half of the state, extending north at least to Douglas 

 county, Mrs. Terry; probably also in the Red river valley. (Two varieties are com- 

 mon at Minneapolis, one bearing yellowish, and the other pinkish flowers. Herrick.) 



CLEOME, L. Cleome. Spider Flower. 



C, integ-rifolia, Torr, & Gray.* Cleonae. Spider Flower. 



Mankato, Upham, Leibcrg. An immigrant from the plains west of Minnesota. 

 Southwest. 



VIOLACE^. Violet Family. 



VIOLA, L. Violet. 

 V. rotuiidifolia, Michx. Round-leaved Violet. 



North of lake Superior (common), Ro7)erts; upper ^Mississippi river. Garrison; 

 extending south to Minneapolis, Griswold, and Saint Paul, Miss Cathcart. 



♦Cleome, L. Sepals distinct or somewhat united. Stamens 6 or rarely 4. Torus 

 minute. Pod linear or oblong, subsessile or stipitate. Annual herbs, or shrubs, with 

 digitate or simple leaves and racemed or solitary flowers. Benth. & Hoolt. 



Cleome integrifolia, Torr. & Gray. Annual, somewhat glaucous, 2 to 3 ftet high, 

 widely branching ; leaves 3-foliolate ; leaflets lanceolate (the lowermost oblong), entire, 

 submucronate ; racemes sometimes nearly 1 foot long; flowers large, showy, reddish 

 purple, rarely white ; sepals united to the middle, persistent ; segments triangular- 

 acuminate ; petals with very short claws ; stamens equal ; pods oblong-linear, com- 

 pressed, much longer than the stipe. Porter and Coidter's Flora of Colorado. 



