ORUCIFER^E. (MUSTARD FAMILY.) 37 



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

 on slender pedicels, tipped with a long style. Cliffs, Harper's Ferry, Natural 

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



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

 high) erect and mostly 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. 



* * Annual or biennial : leafy stems short : flowers white or in No. 4 yellow : style 

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



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

 stems leafy to the base of the dense, at length elongated raceme ; leaves narrowly 

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

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

 pedicels. Dry hills, Illinois, Kentucky, and southward. April. 



4. I>. nemorosa, L. Leaves 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. (Eu.) 



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

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

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

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

 Illinois, Kentucky, and southward. March, April. 



6. D. Caroliiliana, 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 (' 1' long) ; pods broadly linear, smooth, much longer 

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

 southward . March - June. 



7. 1>. lllicrailtlta, Nutt. Pods minutely hairy ; flowers small or minute; 

 raceme sometimes elongated ; otherwise as in No. 6, of which Mr. Bebb proves 

 it to be a variety. From "Wisconsin southwestward. 



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



8. 1>. verna, L. (WHITLOW-GRASS.) Small (scapes l'-3'high) ; leaves 

 all radical, oblong or lanceolate ; racemes elongated in fruit ; 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. VESICARIA, Lam. BLADDER-POD. 



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

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



