(MUSTARD FAMILY.) 67 



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

 below finely stellate; stem-leaves lanceolate or oblong-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 flat 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 2-3 / long, or in 

 a var. (T. brachycarpa, Torr. fr 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. lyrata, L. Mostly glabrous, except the lyrate-pinnatifid root-leaves ; 

 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 shores, 

 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. Roughish-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. 

 (Name from 5/>a'j8r;, applied by Dioscorides to some cress ; meaning unknown.) 



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

 stemmed , flowers white ; pods twisted when ripe. 



1. D. ramosissima, Desv. Diffusely much branched and forming many 

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

 lanceolate, the lower oblanceolate ; racemes corymbosely-branched ; pods hairy, 

 oval-oblong or lanceolate (2-5" long), on slender spreading 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. Hoary-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. 



