CRUCIFERAE (MUSTAKD FAMILY) '223 



the style! pedicels^usually much longer than the silique. D. alpiria possibly 

 or D. gladalis. — Stony slopes, middle elevations; northern Colorado to Mori- 

 tana. 



13. Draba spectabilis Greene, Pitt, 4: 19; 1899. preen but more or less 

 pubescent with short branched hairs: stems few to many from the short 

 woody eaudex, 2^ dm. high, equally leafy to the middle: radical leaves ;ob- 

 ovate to oblanceolate, shprt-petiolate; the cauline ovate, oblong, or lanceolate, 

 acute, entire or toothed, lr-3^ cm. long: sepals subglabrous or hirsute: petals 

 large, yelloisjr; siliques'8-12 mm. long, 6blong> glabrous or nearly so, on spread- 

 ing pedicels-of about equal length; the style prominent. (D. exyloba Greene, 

 PI. Baker. 3: 6. 1901, seems to be a smaller form of this.) — Southern Colorado 

 and New Mexico. .'. > r, 



14. Draba chrysantha Wats. Proc. Am. Acad. 17: 364. 1882. Perennial, 

 with leafy, decumbent or erect stems, 5-15 cm. high, from a branching root- 

 stock, sparingly pubescent with simple hairs: basal leaves narrowly oblanceo- 

 late, 3-4 crii. long, entire or few-toothed, subciliate; feauline oblanceolate to 

 lanceolate: raceme topen; flowers yellow, on pedicels 4-12 mm. long: silidiie 

 glabrous, oblong, acute at each end, 8-10 mm. long, beaked by a short slender 

 S^le. ' [(?) D.'gfaminea Greene, PI. Baker. 3: 5. 1901.] — Mostly alpine; New 

 Mexico to Montana. > >. 



15. Draba cana Rydb. Bull. Torr. Bot. Club 29: 241. 1902. Perennial 

 with a taproot and short caespitose eaudex, whole^plant densely grayish stel- 

 late: stem 1-2 dm. high, often branched: basal leaves numerous, oblanceolate 

 orspatulate, 1-1.5 cm. long; entire or minutely but sharply toothed, densely 

 stellate; stem leaves Jaiiceolate to ovate, about 1 cm; long: racemes many- 

 flowered; pedicels short> nearly erect, in' fruit 2-3 mm. long; flowers small: 

 petals white, about 3 mm. long: silique linear-oblong, 6-8 mm. long,/ densely 

 pubescent; style about 5 mm. long. D.incana. — Mountains of Colorado, far 

 north into British America. 



.,,,16. Draba streptocarpa'Gray, Am. Journ. Sci. 11. 33:' 242. 1862. More 6r 

 less villous witli long, spreading .mostly simple hairs: stems erect, 1 or more 

 from the base, 3-15 cm. high: leaves oblanceolate to lanceolate, mostly acute, 

 somewhat villous, 6-15 mm. long: calyx glabrous or viU'oiiS;: siliques lanceo- 

 late, acute, flattened, more or less twisted, nearly glabrous except on the 

 margins, 6-12 mm. long, on' pedicels half as long; the short style, slender. 

 (L). Bakeri Greene, PI. Baker. 3: 6. 1901.)— Alpine or subalpine; from New 

 Mexico far into British America^ 



17. Draba surculifera A. N^els. Bull. Torr. Bot. Club 26: 237. 1899. Per- 

 enflial: stems few to several, usually with some short leafy stolons at the 

 base, 2-4 dni. high, pubescent with some simple hairs and a closer branched 

 puberulence: basal leaves crowded, oblaiicfeolaite, subpetioled, 3-5- cm. long, 

 thin, glabratfe or stellate-pubescent; cauline similar but ovate or lanceolate, 

 sessile by a broad base, sometimes toothed: petals oTpovate, 'narrowed to a 

 claw^ twice as long as the sepals: silique lanbeolate, finely pubescent, 8-12 mm. 

 long, flat, or sometimes twisted ; the style 1 mm. long.-^Chff sides in the moun- 

 tains; Wyoming. 



18. JDraba Helleriana Greehe, Pitt. 4: 17. 1899. Rather stout, erect, 

 branching, especially above, 2-4 dm. high: pubescence scanty, the hairs sub- 

 appressed and ■•2-*4-rayed: leaves ovate-oblorig, entire or toothed, sessile: 

 racemes few to many, short: sepals yellow, hirsutiilous: petals golden-yellow: 

 siliques much longer than the p,e.dicels, flattened, acute, nearly glabrous ex- 

 cept on the ciliolate margins. D: aurea and var. stj/Zo-sa. {D. neo-mexicana 

 Greene,'!, c' 20.) — Middle elevations; extending into Colorado from' New 

 Mexico. ' ' ' 



19. Draba luteola Greene, 1. c.'.19. Perennial, 1-3 dm. high, cinereously 

 stellate-pube^scent with some villous simple hairs: leaves ovate-lanceolate, 

 subacute, entire or serrulate: racemes' few or several, often long; sepals thin, 

 yellowish-green, hirsute: petals yellow, obtuse: silique- rough^puberulent, 

 tipped with a short slender style; pedicels shorter than the silique and dis- 

 tinctly viUous. D. littea. \D. vher A. Nels. Bot. Gaz. 84: 366. 1902; D. 



