162 XIII. CRUCIFER^. Draba. 



high, very branching. Silicles 3 — 3" broad, very numerous. A well known 

 garden salad. July. :{: ^ 



4. DRABA. 

 Ch". Spa0 jj, acrid, biting ; from the taste of the plant. 



Calyx equal at base ; petals equal ; filaments without teeth ; silicle 

 Dval-oblong, entire, the valves flat or convex ; cells 2, many-seeded ; 

 seeds not margined. 



1. D. VERNA. (Eriophila vulgaris. DC.) Whitloio Grass. 



Scape naked ; Ivs. oblong, acute, subserrate, hairy ; pet. bifid ; stig. sessile ; 

 silicle oval, flat, shorter than the pedicel. — (p A little early-flowering plant in 

 grassy fields. Can. to Va. Leaves all radical, lanceolate, \ — li' long, \ as 

 wide, with a few teeth towards the end. Scape a few inches high, with a 

 raceme of 5 — 15 small, white flowers. Calyx spreading. Petals cleft half 

 way down. Silicles about a line wide and 3—4" long, with deciduous valves. 

 Apr. May. 



2. D. ARABiSANs. Michx. (Arabis. PA.) 



>S'^. leafy, somewhat branched and pubescent ; Ivs. lanceolate, acutely den- 

 tate ; silicle oblong-lanceolate, smooth, longer than the pedicel ; sty. very short. — 

 Lake shores, among rocks, Vt., N. Y., Mich. Stems several from the same 

 root, 6 — 8' high. Radical leaves 1' or more in length, attenuate at base, with 

 a few slender, spreading teeth ; -cauline leaves somewhat clasping. Flowers 

 white, in a short raceme. Silicle elongated (1|' long), acuminate, contorted, 

 and might be called a silique. May. 



3. D. Caroliniana. Walt. (D. hispidula. Michx.) 



St. leafy at base, hispid, naked and smooth at the top ; Ivs. ovate-roundish, 

 entire, hispid ; silicles linear, smooth, longer than the pedicels, corymbose. — (^ 

 Sandy fields. Conn., Dr. Bobbins, R. I., Mr. G. Hunt, S. to Ga. Stem 1—3' high, 

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

 Petals white, twice as long as the sepals. Silicle \' long, lance-linear, many- 

 seeded. Stigma subsessile, Apr. Jn. 



4. D. RAMOsissiMA. Dcsv. (Al)^ssum dentatum. Nutt.) 



Minutely pubescent ; sts. numerous ; Ivs. linear-lanceolate, with remote and 

 slender teeth, upper ones entire ; rac. corymbosely paniculate ; silicle lanceo- 

 late, about the length of the pedicel, and tipped with the style \ as long. — % On 

 rocks, Harper's Ferry-, Va., west to Ky. Stems slender, 4 — 10' long, with 

 tufted leaves at top. Leaves about 1' long, with 1 or 2 teeth on each side. 

 Flowers white, Silicles 3 — 5" in length, ascending. Apr. May. 



5. D. NEMORALTs, Ehrh. 



St. pubescent, branched ; Ivs. oval, hirsute, cauline lanceolate, toothed ; 

 pet. emarginate ; silicles oblong-elliptical, the length of the pedicels ; sds. nearly 

 30. — % Mich. Mo. Plant slender, 8—10' high. Stem with few branches. 

 Leaves mostly radical. Racemes much elongated in fruit, with very long 

 pedicels. Flowers minute, yellowish white. May. 



6. D. CUNEIFOLIA. Nutt. 



Hirsute-pubescent ; st. branching and leafy below ; Ivs. sparingly toothed, 

 radical spatulate-oblong, cauline few, oblong, ovate, somewhat attenuate at 

 base ; rac. rather elongated in fruit; silicles oblong-lanceolate, minutely hispid, 

 twice as long as the pedicels ; pet. emarginate. T. <^ G. — % Grassy places 

 about St. Louis, &c., Nuttall. Plant 3—8' high. Flowers much larger than 

 in the preceding. Petals white, nearly thrice longer than the sepals. Silicles 

 about V long and 30-seeded. March, Apr. 



7. D. BRACHYCARPA. Nutt. 



Minutely pubescent; radical Ivs. roundish-ovate, petiolate ; cauline oUong 

 or linear, slightly dentate or entire ; rar. many flowered, straight, elongated in 

 fruit ; pet. obovate, entire ; silicle oval, glabrous, about as long as the pedicels, 

 10— i2-seeded.—7j. Grassy places near &. Louis, Stem much branched and 

 leafy. Silicles 2—3" long, March, ApT. 



