94 CRUCEPERAE 



2. D. verna L. Shad-flower. Stems erect or ascendinp:, 2 to 4 (or 6) inches 

 hijjh, naked, several from a rosulate cluster of leaves; leaf-blades ovate to lance- 

 olate, toothed near the apex, sessile or shortly petioled, 2 to 6 lines long; petals 

 cleft nearly or quite to the middle, 1 line long, nearly twice as long as the acutish 

 sepals; pods oval, 2 to 3 lines long. 



Sterile or gravelly soil : Lake Co. to Siskiyou Co. Introduced from Europe. 

 Apr. It is sometimes biennial. 



Locs. — Kelscyville, Blankinship ; Potter Valley, B. M. Eolman; Mendocino Co., comm. Ger- 

 trttde Anthony; Carlotta, Van Duzen Eiver, Tracy 5986; Shasta Eiver hills, Siskiyou Co., Butler 

 1143; Yreka/Butlcr 549, 575. 



Eefs. — Draba veena L. Sp. PI. 642 (1753), type European; Jepson, Man. 443 (1925). 



3. D. nemorosa L. "Wood Whitlow. Stems slender, several from the base, 

 1% to 4 (or 12) inches high in ours, pubescent below; leaves basal and sub-basal 

 but rarely rosulate, the blades ovate to oblong-lanceolate, slightly dentate, 2 to 9 

 lines long, sessile or the lowest petiolate; stems usually flowering from near the 

 base; calyx somewhat villous; petals yellow, becoming whitish, slightly retuse; pods 

 elliptic- to narrow-oblong, minutely pubescent, 2^/2 to 6 lines long, much shorter 

 than the divaricate pedicels (6 to 9 lines long). 



Thickets and woods, 2500 to 3000 feet : Siskiyou Co. North to British Columbia 

 and east to the Rocky Mts. and Ontario. Europe, Asia. Mar. 

 Loc. — Treka, Butler 1162. 

 Eefs. — Draba nemorosa L. Sp. PI. 643 (1753), type loe. Sweden; Jepson, Man. 443 (1925). 



4. D. cuneifolia Nutt. Desert Whitlow. Stems several to many from the 

 base, ascending or diffuse, 2 to 10 inches high; leaves basal or mostly basal, the 

 blades oblanceolate to obovate, entire or serrately few-toothed, stellate-pubescent, 

 sessile or the lowest sometimes petiolate, y^. to li/4 inches long; racemes rather 

 dense, or somewhat lax in age, borne on mostly naked stems commonly as long or 

 longer; petals white, notched at apex, the claw very long; pods linear-oblong to 

 narrow-elliptic, pubescent (the hairs forked or occasionally some hairs simple) or 

 glabrous, 3 to 6 lines long, exceeding the pedicels. 



Dry sandy soil, 1000 to 2500 feet : Colorado and Mohave deserts; Death Valley 

 region. East to Texas and Illinois. Mar. 



Locs. — Vallecito, Colorado Desert, Jepson 8576; Grapevine Spr., e. San Diego Co., T. Bran- 

 degee; Goffs, Mohave Desert, Newlon 537; Bradbury Well, Black Mts., Death Valley, /. T. 

 Howell 3635. 



Note on variation. — Segregation of individuals on the basis of stellate or simple hairs is not 

 natural. No individuals have only stellate hairs. Individuals with glabrous pods and individuals 

 with pubescent pods, otherwise identical, occur in a collection from Grapevine Spr., T. Brandegee. 

 The styles in specimens with glabrous pods vary in prominence, just as do the styles in specimens 

 with pubescent pods. The glabrous-podded plants have lax racemes, but so have most of the 

 pubescent-podded cismontane plants (var. integrifolia). The glabrous-podded plants vary in 

 size of pod and length and pubescence of pedicel. 



Var. integrifolia Wats. Stems 1 to several from the base; flowering from near the base, 

 usually with a few leaves below as well as basal; racemes loose, commonly longer than in the 

 species; pods oblong. — Dry sandy soil of the foothills and valleys of cismontane Southern Cali- 

 fornia. East to Arizona, south to northern Mexico. 



Locs. — Pods pubescent: Slover Mt., San Bernardino, Parish (in part); Eiverside; Fall 

 Brook, San Diego Co., Jones 3105 (in part). Pods glabrous: Santa Maria (Syn. Fl. 1^:107) ; 

 San Bernardino Valley, Parish 5980; Slover Mt., Parish (in part) ; Fall Brook, San Diego Co., 

 Jones 3105 (in part) ; San Diego. 



Var. calif omica Jepson. Stems strictly erect, 3 to 5% inches high; leaves in a dense basal 

 tuft, the stems nearly naked, flowering from about the middle or a little below; herbage and pods 

 puberulent; petals obtuse or obscurely notched; pods oblong-lanceolate, 3 to 3^2 lines long, 

 ascending. — White Mts., Inyo Co. 



Eefs.— Draba cuneifolia Nutt.; T. & G. Fl. 1:108 (1838), type loc. St. Louis, Mo., Nuttall; 

 Jepson, Man, 443 (1925). Var. integrifolia Wats. Proc. Am. Acad. 23:256 (1888), type loc. 



