arabis. CRUCIFER2E. 43 



mouth of the St. Lawrence and Virginia. Eu. & Asia. 



A. furcata Watson Proc. Am. Acad, xvii, 362. Stems several from a 

 slender branching perennial rootstock, slender ascending, 10-18 inches 

 high : lower leaves oblong-ovate, attenuate below to a stout petiole, few- 

 toothed, 1-3 inches long; sparingly pubescent and ciliate with coarse 

 forked hairs ; cauline oblong to linear or lanceolate, scarcely auricled : flow- 

 ers large in a lax few-flowered raceme ; petals white broadly spatulate, 

 6-7 lines long, more than twice as long as the sparingly hirsute sepals: 

 pods 10-20 lines long, less than a line broad, attenuate to a very short 

 style, on slender pedicels 6-10 lines long: seeds oblong-elliptical, winged 

 at the lower end. On bluffs of the Columbia river from the mouth of the 

 Sandy to near Hood river. 



A. Suksdorfli. A. furcata Watson I . c. in part. Stems tufted from a 

 thick perennial root, simple, 3-8 inches high, strictly erect, lower leaves 

 oblong-obovate 1-3 inches long, sparingly pubescent and ciliate with 

 branched hairs, entire or few-toothed; cauline few, oblong to lanceolate: 

 fkrwers middle-sized, in a strict somewhat dense raceme : petals wdiite, 

 spatulate 3-5 lines long: pods 6-18 lines long by less than a line broad, 

 erect on short erect pedicels. On dry alluvial ridges Mount Adams Wash- 

 ington near the line of perpetual snow. 



A. purpurascens Howell in Herb. Greene Pitt, i, 161. Usually livid- 

 purple throughout: stems tufted, from a branching perennial root, simple, 

 usually slender, 6-30 inches high, soft-pubescent with simple or forked 

 hairs and a shorter, more branching pubescence beneath : leaves scattered 

 but rather ample, thin sparsely pubescent: the lowest obovate-oblong at- 

 tenuate below to a petiole, the cauline narrowly-oblong sessile, all with 

 scattered coarse and salient teeth : racemes loose and few-flowered ; calyx 

 purple 2-3 lines long : petals 6-9 lines long deep rose purple : pods slender, 

 2 inches long less than a line wide. On rocky ridges and bluffs, northern 

 base of the Siskiyou Mountains from Ashland to Waldo Oregon. 



A. atrorubens Suksdorf in Herb. Greene Eryth. i, 223. Pale and 

 glaucescent or the herbage becoming purplish in full maturity: stems 

 erect, a foot or more high from a branching perennial root : radical leaves 

 spatulate-oblong, an inch long, stellate-pubescent; cauline ones glabrous, 

 ovate to ovate-lanceolate, sessile and auriculate-clasping, all rather re- 

 motely and coarsely serrate-toothed : raceme simple, strict, few-flowered : 

 sepals dark red, sparsely pubescent with branching hairs: petals dark red 

 or almost black about 4 lines long : pods suberect narrowly linear, acute, 3 

 inches long or more: seeds flattened, narrowly winged. Edge of brush- 

 lands on the higher part of the Klickitat hills, Klickitat county, Wash- 

 ington. 



A. sparsiflora Nutt. T. & G. Fl. i, 81. Stems 1-3 feet high from a bi- 

 ennial or perennial root, sparingly pubescent below with forked or simple 

 hairs: lower leaves numerous, entire oblanceolate, on slender petioles; 

 cauline leaves oblong to linear-lanceolate, entire, sessile and clasping by 

 the auricled base, acute : racemes rather few-flowered ; flowers small ; pet- 

 als linear-oblong, bright purple, twice as long as the often colored sepals : 

 pods 2-3 inches long, spreading or suberect on spreading pedicels : seeds 

 narrowly winged. On dry plains, eastern Oregon and Washington to the 

 Rocky Mountains and northern Nevada. 



A. Bolanderi Watson Proc. Am. Acad, xxii, 467. More or less pubes- 

 cent throughout with soft stellate hairs : stem solitary, much branched, 1- 

 2 feet high from a biennial root : radical leaves not known ; cauline lanceo- 

 late, 1-2 inches long, auriculate-clasping entire : flowers small 2-3 lines 

 long, rose-colored : sepals and pedicels pubescent : pods mostly divaricately 

 spreading, glabrous, straight, 6-18 lines long obtuse with a broad sessile 

 stigma: valves' 1-nerved to the middle : seeds orbicular to elliptical, nar- 

 rowly winged. Yosemite Valley, Bolander; Washington, Brandegee. 



