cruciferte. (mustard family.) 67 



7. A. COnflnis, Watson. Scarcely glaucous, 1-3° high; pubescence 

 below finely stellate; stem-leaves lanceolate or oblony-linear, entire (1-2' long) 

 with narrow auricles, or the lowest spatulate and toothed ; petals white or 

 rose-color, fully twice the length of the calyx ; pedicels and ^3.t pods loosely erect, 

 or ascending, or even spreading ; seeds wing-margined, when mature little nar- 

 rower than the partition. (A. Drummondii, Man.) — From the lower St. 

 Lawrence to Minn., south to Conn., N. Y., and 111. — Pods 2^-^^' long, or in 

 a var. (T. brachycarpa, Torr. <f- Gray) only 1-2' long. 



§ 3. PSEUDARABIS. Seeds oblong or elliptical, very small, wingless, in one 

 row ; cotyledons often more or less oblique. Biennial or perennial, branching 

 from the base. 



8. A. lyr^ta, L. Mostly glabrous, except the /_yra^e-;7?"n?zaf//7rf roo^/ea^es .• 

 stem-leaves scattered, spatulate or linear with a tapering base, sparingly 

 toothed or entire; petals white, much longer than the yellowish calyx; pods 

 long and slender, flat, ascending or spreading. — On rocks or sandy sliores, 

 New Eng. to Ky. along the mountains, Minn., and northward. April -July. 

 — Usually biennial, but southward in the mountains decidedly perennial. 



9. A. dentata, Torr. & Gray. Koughish-pubescent, slender (1 -2° high) ; 

 leaves oblong, very obtuse, unequally and sharply toothed ; those of the stem 

 numerous, half-clasping and eared at the base, of the root broader and tapering 

 into a short petiole ; petals (whitish) scarcely exceeding the calyx ; pods widely 

 spreading, very slender, short-stalked ; style scarcely any. — ■ N. Y. to Mich., 

 Minn., and southward. May, June. 



6. DRAB A, Dill. Whitlow-Grass. 



Pod oval, oblong, or even linear, flat ; the valves plane or slightly convex ; 

 the partition broad. Seeds several or numerous, in 2 rows in each cell, mar- 

 ginless. Cotyledons accumbent. Filaments not toothed. — Low herbs with 

 entire or toothed leaves, and white or yellow flowers ; pubescence often stellate. 

 (Isame from hpa^r], applied by Dioscorides to some cress ; meaning unknown.) 



§ 1. DRAB^A. Petals not notched or cleft; perennial or biennial, leafy- 

 stemmed , flowers white, pods twisted when ripe. 



1. D. ramosissima, Desv. Diffusely much branched and ionmngmRny 

 radical tufts, perennial (5-8' high), pubescent; leaves laciniate-toothed ,\mea,T- 

 lanceolate, the lower oblanceolate , racemes corymbosely-branched ; j)ods hairy, 

 oval-oblong or lanceolate (2-5" long), on slender vSpreading pedicels, tipped 

 with a long style. — Cliffs, Harper's Ferry, Natural Bridge, etc., Va., to Ken- 

 tucky River, and southward. April, May. 



2. D. incana, L. Hoar y-pubescent , biennial or somewhat perennial, the 

 radical tuft seldom branching ; leaves oblanceolate or the cauline lanceolate to 

 ovate, few-toothed or entire ; pods oblong to lanceolate, usually acute and straight, 

 often pubescent, on short erect pedicels ; style very short or none. — Dry rocks, 

 Willoughby Mountain, Vt. ; also northward and far westward. (Eu.) 



Var. arabisans, Watson. Caudex much branched ; pod glabrous, acu- 

 minate or acute, twisted, beaked with a longer distinct style. (D. arabisans, 

 Michx.) — N. Vt. to western N. Y. and the shores of the upper lakes. 



