ARABis. CRUCIFER/E. 45 



per ones linear-oblong and clasping but not auriculate, all entire or spar- 

 ingly toothed : petals white with purple veins, linear spatulate, about 3 

 lines long, twice as long as the sparingly pubescent sepals and exceeding 

 the pedicels : pods ascending, falcate 2-3 inches long by a line, broad 

 acuminate, stigma sessile: seeds acutely margined. On high rocky 

 ridges, Klickitat county to Spokane county, Washington and Union 

 county Oregon . 



A. platysperma Gray Proc. Am. Acad, vi, 519. Glaucous, sometimes 

 wholly glabrous : stems erect or ascending from a branching perennial root- 

 stock, 2-12 inches high, simple or branched: lower leaves oblanceolate, 

 about an inch long ; the upper oblong to linear-lanceolate, sessile : petals 

 rose-colored or nearly white 2-3 lines long : pods erect or a little spreading, 

 1-2 j^ inches long by 1^-2)^ lines wide, attenuate to a short stout style; 

 valves distinctly veined, 1-nerved toward the base: seeds orbicular, 

 broadly winged. From Mount Hood Oregon to the San Bernardino and 

 Sierra Nevada Mountains. 



A. Howellii Watson Proc. Am. Acad, xxv, 124. Glabrous ; stems 1-4 

 inches high from a much-branched cespitose caudex : lower leaves glau- 

 caus, entire, linear-oblanceolate, an inch long, often sparsely ciliate tow- 

 ards the base ; the few cauline narrowly oblong obtusish, sessile some- 

 what clasping but not auriculate at base : flowers few, pale to bright pink, 

 3-4 lines long: pods erect 1-2 inches long by 2 lines broad acuminate7 

 stigma sessile : seeds orbicular, broadly winged. On Ashland Butte, Sis- 

 kiyou Mountains, Oregon. 



§ 4 Pendula Flowers nodding, usually pale. Pods usually- 

 pendulous. Seeds in 1-2 rows in the cells. 



A. snffrntescens Watson Proc. Am. Acad, xvii, 362. Glabrous 

 throughout or sparingly stellate pubescent below : stems several from a 

 branching woody perennial caudex, 8-12 inches high : lower leaves nar- 

 rowly oblanceolate, acute, about an inch long : the cauline more oblong 

 and sessile or shortly auriculate-clasping : racemes few-flowered ; sepals 

 purple, 3 lines long: pods 1-2)4 inches long by 1)4-2 lines wide, attenuate 

 to a short style, straight, pendant, on reflexed pedicels 4^6 lines long: seeds 

 orbicular winged. On dry rocky ridges. Mount Adams Washington to the 

 bluffs of Snake river in Oregon and the Siskiyou Mountains near the 

 northern line of California. 



A. retrofracta Graham Edinb. New Phil. Journ. 1829, 344. Stems 

 erect from a biennial root, 1-3 feet high, simple or branching above, gla- 

 brous and often somewhat glaucous above, minutely pubescent below with 

 reflexed simple or forked hairs : leaves narrowly lanceolate to linear, the 

 lower ones attenuate below to a winged petiole, rather coarsely serrate- 

 dentate, an inch or two long, densely pubescent with stellate hairs ; the 

 upper ones linear, sessile deeply sagittate entire 13^-3 inches long : ra- 

 cemes few to many-flowered ; flowers nodding on spreading tomentoge ped- 

 icels: petals spatulate, pale to bright purple, 3-4 lines long, twice as long 

 as the pubescent calyx : pods linear, 2-3 inches long by half a line wide and 

 with the pedicels strongly refracted: seeds obovate, narrowly winged, 

 along streams, eastern Oregon and Wsshington to the Rocky Mountains 

 and Brit . Columbia. 



A. secunda Howell Eryth. iii, 33. Stems several from a branching 

 woody base 10-18 inches high, stellate-pubescent : lower leaVes lanceolate, 

 about an inch long, narrowed below'to a winged petiole, entire, acute; cau- 

 line leaves linear, revolute, sessile, distinctly auricled 6-12 lines long: ra- 

 cemes many-flowered, strictly secund : pods 1-2 inches long, less than a 

 line wide on flliform pedicels 2-3 lines long that are all deflexed one way 

 forming a secund spike; seeds small, narrowly winged, in 1 row. On 

 dry ridges Mount Adams, Washington. 



