CRUCIFERAE. [VOL. II. 



ii. Draba alpina L,. Alpine Whitlow- 

 grass. (Fig. 1765.) 



Draba alpina L,. Sp. PI. 642. 1753. 



Perennial by a branched caudex, densely tufted, 

 scapes pubescent, ^'-6' high. Leaves all basal, 

 entire or few-toothed, oblong, or oblong-lanceo- 

 late, obtuse or acute at the apex, mostly narrowed 

 at the base, ciliate, or villous-pubescent, some- 

 times with some stellate hairs, 2 // -6 // long, sessile 

 or short-petioled ; flowers yellow, about 3" broad; 

 calyx pubescent or villous; style %" long or less; 

 pod oval or ovate, narrowed at both ends, glabrous, 

 or somewhat pubescent, 2# // -4 // long, \"-\W 

 wide; pedicels ascending, i // -5 // long. 



Hudson Bay to the mountains of British Columbia 

 and Alaska. Also in northern Europe and Asia. 

 Summer. 



30. SOPHIA Adans. Fam. PI. 2: 417. 1763. 

 [DESCURAINIA Webb & Barth. Phyt Can. i: 72. 1836.] 



Annual or perennial herbs (some exotic species shrubby), canescent or pubescent with 

 short forked hairs, with slender branching stems, 2-pinnatifid or finely dissected leaves, and 

 small yellow flowers in terminal racemes, the racemes much elongating in fruit. Calyx 

 early deciduous. Style very short. Siliques linear or linear-oblong, slender-pedicelled, the 

 valves i-nerved. Seeds very small, oblong, wingless, in i or 2 rows in each cell; cotyledons 

 incumbent [Name in allusion to reputed medicinal properties.] 



About 12 species, natives of the north temperate zone, the Canary Islands and the Andes of 

 South America. Besides the following, another occurs in the southwestern United States. 



Pods narrowly linear, 8"-ia" long, J" wide, curved upward; pedicels ascending. 



i. 5. Sophia. 

 Pods linear-oblong, 4" -7" long, nearly or quite i" wide, straight or nearly so; pedicels divergent 



or ascending, mostly longer than the pods. 



Densely and finely canescent; pedicels diverging nearly at right angles. 2. S. pinnata. 

 Glabrate or somewhat canescent; pedicels ascending. 3. S 1 . incisa. 



Pods linear, 4"-s" long, about 'A" wide: pedicels erect-appressed or narrowly ascending, equalling 

 or shorter than the pods. 4. S. Hartwegiana. 



i. Sophia Sdphia (L.) Britton. Flixweed. 

 Herb-Sophia. (Fig. 1766.) 



Sisymbrium Sophia L. Sp. PI. 659. 1753. 



Descurainia Sophia Webb; Prantl in Engler & Prantl, Nat. Pfl. 

 Fam. 3: Abt. 2, 192. 1892. 



Minutely hoary-canescent, stem usually much branched, 

 i-2# tall, quite bushy. Leaves 2-3-pinnatifid into nar- 

 rowly linear or linear-oblong segments; flowers very numer- 

 ous, about 3" long; pedicels ascending, very slender, 6 f/ -8" 

 long, glabrous or nearly so; pods narrowly linear, 8"-l2" 

 long, fa" thick, ascending, curved upwards; seeds in i row 

 in each cell of the pod. 



In waste places, New Brunswick to Ontario, south to New 

 York and Illinois. Also in ballast about the northern seaports. 

 Naturalized from Europe. Native also of Asia. June-Aug. 

 Called also Fine-leaved Hedge-Mustard. 



