CRUCIFERiE. 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. (^.—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, hitroduced from Europe. Common Shepherd's Purse. 



4. DRABA. iyfmi.— Whitlow Grass. 

 (From the Greek 6pafiri, 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. Caroliniaiia 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, Z>. Mspidida Mich. 



Sandy fields. Conn, to Geor. W, to Miss. April, May. (Tl—S terns 2 4 



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

 4 — 6 lines long, linear-lanceolate. Flowers white. Carolina Whitlow Grass. 



2. /?, 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. (g). — Stems 6 — 12 inches 

 high. PoMcA half an inch long, erect, acuminate, twisted. Floivers white. 



Bunch-Jlowered Whitlow-grass. 



5. EROPHILA. D. C— Erophila. 

 (From the Greek rjp, rjpos, spring, and (piXXeo to love; in allusion to its early 

 Ilowering.) 



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

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

 teeth. 



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

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



Fields. Can. to Virg. March— May. (£).— Scape 2—6 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 whicfl I have collected 

 elsewhere. Common Whitlow Grass. 



6. COCHLEARIA. Linn.— Scnrvy Grass. 

 (From the Latin, cochlear, 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. 



