162 XIII. CRUCIFER./E. DRABA, 



high, very branching. Silicles 2 3" broad, very numerous. A well known 

 garden salad. July. ^ 



4. DRABA. 



Cfr. (Jpa/?j, acrid, biting ; from the taste of the plant. 



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

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

 seeds not margined. 



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



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

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

 grassy fields, Can. to Va. Leaves all radical, lanceolate, \ 1^' 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. ARABlsANs. Michx. (Arabis. PA.) 



St. leafy, somewhat branched and pubescent ; Ivs. lanceolate, acutely den- 

 tate ; siliele 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 I' or more in length, attenuate at base, with 

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

 white, in a short raceme. Siliele elongated (!' 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. Rabbins, R. L, 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. Siliele ' long, lance-linear, many- 

 seeded. Stigma subsessile. Apr. Jn. 



4. D. RAMOSISSIMA. Desv. (Alyssum dentatum. Nutt.) 



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

 slender teeth, upper ones entire ; roc. corymbosely paniculate ; siliele 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. NEMORALIS. 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, 810' 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. Ij. 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 J' long and 30-seeded. March, Apr. 



7. D. BRACHYCARPA. Nutt. 



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

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

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

 10 12-seeded. 7J. Grassy places near St. Louis. Stem much branched and 

 leafy. Silicles 23" long, March, Apr. 



