32 CRUCIFER^E. Arabia. 



least on the petioles ; the cauline entire, ovate or ovate-lanceolate, clasping by the 

 sagittate base : petals 2 to 3 lines long, little exceeding the sepals : pods erect and 

 usually appressed, 2 to 4 inches long, less than a line wide, nearly straight, on ped- 

 icels 3 to 4 lines long; style short ; stigma 2-lobed : seeds in two rows, narrowly 

 winged or wingless. Turritis ylabra, Linn., and T. macrocarpa, Xutt. ; Torr. & 

 Gray, Fl. i. 78. 



In the mountains from San Diego to the British Boundary and northward, and east across the 

 continent ; also in Europe and N . Asia. 



A. HIRSUTA, Scop., has not been certainly found in California, but is frequent in the Columbia 

 Valley arid northward, and also east to Colorado and the Atlantic. It is usually more slender 

 and hirsute than the last, 1 to 2 feet high, the stems often clustered and with slender strict 

 branches above ; leaves often rosulate at the base, 1 to 2 inches long, the cauline ovate to oblong 

 or lanceolate ; pod shorter, 1 to 2 inches long, narrower, the wingless seeds strictly in one row. 



A. SPATHULATA, Nutt., is another nearly allied species, but little known, which may occur 

 in the State, having been found in Oregon and W. Nevada (if No. 67 Watson be correctly 

 referred to it). It appears to be a low slender plant, much like small forms of A. hirsuta, but 

 with fewer leaves, those upon the stem scattered and entire ; pedicels spreading ; pods still 

 narrower, less than an inch long, beaked with a narrow style. 



* * * Mostly perennials ; pods erect or ascending : flowers mostly larger, deeper 



colored. 



3. A. Lyallii, Watson. Bright green or glaucous and glabrous, or usually 

 somewhat villous below with spreading hairs, especially on the margin of the peti- 

 oles, rarely more or less canescent with stellate pubescence : stems slender from a 

 branching perennial base, 2 to 15 inches high : radical leaves oblanceolate, on slender 

 petioles, acute, entire ; cauline oblong-lanceolate, clasping and sagittate at base : 

 petals light pink, aboiit 3 lines long, twice longer than the sepals : style none : pods 

 straight, narrowly linear, 1 to 3 inches long : seeds in 2 rows, narrowly winged. 

 Proc. Am. Acad. xi. 122. A. Drummondii, var. alpina, Watson, Bot. KingExp. 18. 



In the high Sierra Nevada from Mono Pass to Washington Territory, and also eastward to 

 Utah and W. Wyoming ; often alpine and dwarf. A somewhat variable subalpine and alpine 

 species, distinguished by its perennial root from A. Drummondii, which seems not to occur west 

 of the Rocky Mountains. 



A. CANESCENS, Nutt., of the mountains in E. Nevada and Wyoming, is like smaller forms of 

 A. Lyallii, but is densely stellate-tomentose, the somewhat broader pods reflexed and often 

 secund, and the seeds in one row and more broadly winged. 



4. A. platyspezma, Gray. Canescent with a short stellate pubescence : stems 

 several from a perennial base, slender, 4 to 12 inches high : leaves entire, the lower 

 oblanceolate or spatulate, an inch long ; the cauline oblong-lanceolate, sessile but 

 not auricled at base, 4 to 10 lines long : petals rose-colored, 2 to 3 lines long : pods 

 straight, erect, 1 to 2 inches long and 2 lines wide, acuminate, without style, 

 loosely reticulated : seeds in one row, with a broad thin wing. Proc. Am. Acad. 

 vi. 519 ; Watson, Bot. King Exp. 16. 



Alpine or subalpine in the Sierra Nevada from the Yosemite to Mt. Shasta ; in the East Hum- 

 boldt Mountains, Nevada, Watson. 



5. A. blepharophylla, Hook. & Am. Smooth or slightly villous, the stems 

 often tufted, 4 to 1 2 inches high : leaves strongly ciliate, entire or sparingly sinuate- 

 toothed, the lower obovate or broadly spatulate, 1 to 2 inches long, the cauline 

 oblong, sessile, obtuse or acutish : flowers large ; sepals generally colored ; petals 

 bright purple, 6 to 9 lines long: pods 1 to 1| inches long and as many lines broad, 

 beaked with the short stout style, loosely spreading : seeds in one row, a line in 

 diameter, wingless or narrowly margined. Bot. Beechey, 321 ; Bot. Mag. t. 6087. 



On low hills near the coast, from San Francisco to Monterey. Blooming in early spring and 

 " superb in cultivation." 



6. A. repanda, Watson. Biennial, pubescent especially below with loose 

 branched hairs : stem rather stout and coarse, 2 feet high, and with the spreading 



