CRUCIFER^E. 25 



3. CAPSELLA. D. C. Shepherd's Purse. 

 (The diminutive of capsula ; a little capsule or box.} 

 Pouch triangular, wedge-form at base ; valves boat-form, 

 not winged ; cells many-seeded. 



C. Bursa-pastoris D. C. : radical leaves pinnatifid. 



Cultivated grounds. Throughout the U. S. April Oct. (J). Stem from 3 

 inches to 1 2 feet high. Radical leaves more or less pinnatifid, hairy ; cauline 

 ones oblong, toothed, sagittate at base. Flowers small, white, in terminal spiked 

 racemes. Introduced from Europe. Common Shepherd's Purse. 



4. DRABA. Linn. Whitlow Grass. 

 (From the Greek fyaffr], acrid, as are the leaves of many of this genus.) 



Pouch sessile, oval or oblong ; valves flat or slightly convex. 

 Seeds many, not margined. Calyx equal. Petals entire. Sta- 

 mens without teeth. 



1. D. Caroliniana Walt.: stem leafy and hispid at the base, naked and 

 smooth at the top ; leaves ovate-roundish, entire, hispid ; pouch linear, 

 smooth, longer than the pedicel. D. hispidula Mich. 



Sandy fields. Conn, to Geor. W. to Miss. April, May. .Stems 24 

 inches high. Leaves clustered on the lower part of the stem, very hairy. Pouch 

 46 lines long, linear-lanceolate. Flowers white. Carolina Whitlow Grass. 



2. D. arabisans Mich. : stem leafy, somewhat branched, subpubescent ; 

 leaves sparingly toothed ; radical ones wedge-lanceolate ; cauline oblong ; 

 pouch smooth, lanceolate-oblong, longer than the pedicel. 



Rocks. Can. to Virg. W. to Miss. May, June. @. Stems 612 inches 

 high. Pouch half an inch long, erect, acuminate, twisted. Flowers white. 



Bunch-jlowered Whitlow-grass. 



5. EROPHILA. D. C. Erophila. 



(From the Greek np, rjpos t spring, and ^uAAtw to love; in allusion to its early 

 flowering.) 



Pouch oval or oblong ; valves flat. Seeds many, not mar- 

 gined. Calyx equal. Petals 2-parted. Stamens without 

 teeth. 



E. vulgaris D. C. : pouch elliptic, shorter than the pedicel ; scape 5 15 

 flowered. E. Americana D. C. Draba verna Linn. 



Fields. Can. to Virg. March May. .Scape 26 inches high, naked. 

 Leaves lanceolate, somewhat toothed, hairy. Flowers minute, white. Pouch 

 on long pedicels, with a very short style. Specimens of this plant obtained 

 from my friend, Dr. Matthew Stevenson, of Washington co. N. Y. agree in 

 all respects with the foreign E. vulgaris, as do also those which I have collected 

 elsewhere. Common Whitlow Grass. 



6. COCHLEARIA. Linn. Scurvy Grass. 



(From the Latin, cochkar, a spoon ; from a fancied resemblance in the leaves.) 

 Pouch sessile, ovate, globose, or oblong ; valves, ventricose. 

 Seeds many, not margined. Calyx equal at base, spreading. 

 Petals entire. Stamens without teeth, 



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