STATE GEOLOGIST. 25 



A. laevig-ata, Poir. Smooth Rock Cress. 



hAkeFepia, Miss Manning; GooAhne county, Sandberg; Minneapolis, Twining, 

 Roberts; Isanti and Slierburne counties, Upham; Stearns county, Garrison; lalce Su- 

 perior, Whitney. 



A. Canadensis, L. Sickle-pod. 



Frequent tlirouglittie south lialf of tlie state ; extending north to the upper Mis- 

 sissippi river. Garrison. 



A. perfoliata, Lam. Tower Mustard. 



Poplar river, lake Superior, Juni; upper Mississippi river, Garrimn ; Stearns 

 county, Campbell; Blue Earth county, Leiberg ; lake Pepin, Miss Manning. 



A. Druinmonclii, Gray. Drummond's Tower Mustard. 

 Frequent, often common, throughout the state. 



THELYPODIUM, Endl. Eock Cress. 



T. pinnatifldum, Watson. (Arabis hesperidoides, Gray). Rock Cress. 

 Northfleld, Chaney. South. 



BARBAREA, R. Br. Winter Cress. 



B. vulg-aris, R. Br., var. stricta, Regel. Winter Cress. Yellow Rocket. 

 Put in bay, lake Superior, Jimi; upper Mississippi river. Garrison; Miuiieapolis, 



Roberts. 



ERYSIMUM, L. Treacle Mustard, 



E. cheiranthoides, L. Worm-seed Mustard. 

 Frequent, or common, thi'oughout the state. 



E. asperum, DC* Prairie Rocket, Western Wall-flower. 



Abundant at Walhalla, Dakota, thirty miles west of the tied river, Scott; "a very 

 prominent object on dry, gravelly soil throughout the prairie region" of Manitoba, 

 Macoun, and ranging tlience south to Mexico ; doubtless extending sparingly into the 

 west edge of Minnesota ; also found by Rev. J. Pemberton at Redwood Falls, and by 

 Br. Sandberg on the limestone bluff of Belle creek opposite to the mill in Vasa, Good- 

 hue county, occurring (like Vesicaria Ludoviciana in the same county) far east from its 

 general limit. 



E. parviflorvim, Nutt.f Small-flowered Prairie Rocket. 



Ked river valley, Dawson, Scott; Minneapolis (beside railroad a mile southeast 

 from tlie university : determined by Mr. Watson as this species ; having light yellow 

 "petals but half longer than the (3 to 4 lines long) sepals" ; yet much branched near the 

 base, numerous stems of nearly equal hight (I to ly^ feet) being thus sent up from a 

 single root; leaves narrowly lanceolate, mostly entire ; pods about VA inches long, 

 beaked with a stout style, erect on short pedicels), Upliam. West. 



*Erysimum asperum, DC. Biennial, canescent with short appressed hairs : stems 

 solitary and simple, rarely branched above, 1 to .Sfeet high, or less : leaves oblanceolate 

 or narrowly spatulate ; the cauline linear to linear-lanceolate, entire or sparingly 

 repand with short acute teeth, l to 3 inches long : sepals narrow, 4 to 6 lines long, 

 strongly gibbous : petals 8 to 12 lines long, light yellow to deep orange or purple : pods 

 1 to 4 inches long, a line wide, beaked with a stout style, ascending on stout spreading 

 pedicels 3 lines long. Brewer and Watson's Botany of California. 



tSee description of Erysimum parviflorum, Nutt., on next page. 



