ckucifeejE. (mustard family.) 37 



cemes corymbose-branched; pods hairy, oval-oblong or lanceolate (2" -5" long), 

 on slender pedicels, tipped with a long sCyfc. — ClifFs, Harper's FeiTy, Natural 

 Bridge, &c., Virginia, to Kentucky River, and southward. April, May. 



2. D. arAbisans, Michx. Slightly pubescent ; flowering stems (6' -10 

 high) erect and mosibj simple; leaves oblong-lanceolate, linear, or the lower spatu- 

 late, sparingly toothed; racemes short, usually simple; pods glabrous, oblong- 

 lanceolate (5" -6" long), on rather short pedicels, tipped with a very short style. 

 — Rocky banks, Vermont, Northern New York, Upper Michigan, and north- 

 ward. May, June. — Petals large. 



« * Anmml or biennial ; leafy stems short : flowers white or in No. 4 yellow : style 

 none. (Leaves oblong or obovate, hairy, sessile.) 



3. D. brachycArpa, Nutt. Low (2' -4' high), minutely pubescent, 

 stetns leafy to the base of the dense, at length elongated r.aceme ; leaves narrowly 

 oblong or the lowest ovate (2J" - 4" long), few-toothed or entire ; flowers small ; 

 pods smooth, narrowly oblong, acutish (2" long), about the length of the ascending 

 pedicels. — Dry lulls, Illinois, Kentucky, and southward. April. 



4. D. nemordsa, L. Loaves oblong or somewhat lanceolate, more 

 or less toothed ; racemes elongated (4' - 8' long in fruit) ; petals emarginate, small ; 

 pods elliptical-oblong, half the length of the horizontally spreading pedicels, pubescent 

 (D. nemoralis, Ehrh.), or smooth (D. lutea, DC). — Fort Gratiot, Michigan, 

 and northward. (En.) 



5. D. cimeifolla, Nutt. Leaves obovate, wedge-shaped, or the lowest 

 spatulate, toothed; raceme somewhat elongated in fruit (l'-3'), at length equal- 

 ling the naked peduncle ; petals emarginate, much longer than the calyx ; pods 

 oblong-linear, minutely hairy, longer than the horizcmtol pedicels. — Grassy places, 

 Illinois, Kentucky, and southward. March, April. 



6. D. Caroliniana, Walt. Small (l'-4" high) ; leaves obovate, most- 

 ly entire; peduncles scape-like; petals twice the length of the calyx; raceme 

 short or corymbose in fruit (J'-l' long) ; pods broadly linear, smooth, much longer 

 than the ascending pedicels. — Sandy fields, Rhode Island to Illinois, and 

 southward. March -June. 



7. D> micrdlltlia« Nutt. Pods minutely hairy ; flowers small or minute; 

 raceme sometimes elongated; otherwise as in No. 6. — From Wisconsin south- 

 westward. 



§ 2. ER6PHILA, DC. — Petals 2-cleft. (Annual or biennial : flowers white.) 



S. D. vcma, L. (Whitlow-Gbass.) Small (scapes l'-3'high) ; leaves 

 all radical, oblong or lanceolate ; racemes elongated in fniit; pods varying from, 

 round-oval to oblong-lanceolate, smooth, shorter than the pedicels. — Sandy 

 waste places and road-sides : not common. April, May. — Not found north of 

 Lower Canada. The same as the plant of Europe, and perhaps introduced > 

 (Eu.) 



13, VJESICABIA, Lam. Bladdee-pod. 



Pouch globular and inflated, or more or less flattened parallel to the orbicnlar 

 partition ; the hemispherical or convex thin valves nerveless. Seeds few or sev- 



