Draha. CRUCIFER.^. Ill 



simple or branched ; stems brauching from the base upward, very leafy, 2 to 6 inches high : 

 leaves oblong-oblanceolate, obtusish, entire, about half inch long or less : flowers pale yellow : 

 sepals pubescent ; pods lanceolate to broadly oblong, acute or obtuse, jjubescent, much cor- 

 rugated and twisted, 2 to 5 lines long not including the very slender style (a line or more 

 long) which is attenuate to a minute stigma: pedicels 1 to 3 lines long. — Mt. Greyback 

 in the San Bernardino Mountains, Lemmun, IF. G. Wright. 



■i— -i— Flowers white. 

 ++ Stems simple or sparingly branched. 

 = Cauline leaves several (or few in D. Breweri). 

 D. incana, L. Stellate-pubescent throughout ; pubescence usually loose : caudex often 

 simple; stem 2 to 15 inches high: leaves mostly oblanceolate or the cauline sometimes 

 ovate, few-toothed or entire : pods oblong to lanceolate, usually acute and straight, glabrous 

 or finely stellate-pubescent, 3 to 5 lines long, usually suberect on ascending pedicels 1 to 3 

 lines long; style very short. — Spec. ii. 643. D. contorta, Ehrh. Beitr. vii. 1.55. D. confusa, 

 Ehrh. 1. c, the form with pubescent pods. — Labrador to New Brunswick and N. Vermont ; 

 in the Rocky Mountains inlat. 51°, and in Colorado at Georgetown, Greene, and South Park, 

 Rothrock & Wolf; at Ft. Eraser and McLeod's Lake, Brit. Columbia, Macoun. Some of the 

 western specimens are more finely and densely pubescent than is usual. (Greenland, Eu., 

 Asia.) 



Var. arabisans, Watson. Caudex much branched : pod glabrous, acuminate or 

 acute, often twisted, 4 to 6 lines long, beaked with a longer distinct style. — Proc. Am. 

 Acad, xxiii. 260, & in Gray, Man. ed. 6, 67. D. arabisans, Michx. El. ii. 28 ; Gray, Gen. 111. 

 i. 160, t. 68. D. Arabis, Pers. Syn. ii. 190. D. (jlabella, Pursh, El. ii. 434. D. incana, var. 

 glabriuscula, Gray, Ann. N. Y. Lye. iii. 222. D. Henneana, Schlecht. Linnaea, x. 100. 

 D. Canadensis, Brunet, PI. Canad. 21, a form with ovate pods. — Labrador to N. Vermont 

 and New York, and the shores of Lakes Huron and Superior. Grading indefinitely into the 

 typical form of the species. 



D. Breweri, Watson, 1. c. Dwarf and alpine, hoary throughout with a dense stellate 

 pubescence; the few stems from a shortly branched caudex, 1 to 3 inches high: leaves 

 crowded, oblong to linear-oblong, obtuse, entire or rarely sparingly toothed, sometimes 

 slightly ciliate at base, 2 to 4 lines long ; the cauline few, oblong-ovate ; flowers small : 

 sepals oblong, herbaceous, shorter than the petals : pods linear-oblong, obtusish, pubescent, 

 2 or 3 lines long, on short ascending pedicels : stigma sessile or nearly so. — Mt. Dana, 

 California, at 12,000 feet alt., Brewer ; White Mountains, Mono County, at 13,000 feet alt., 

 ShocJcley. 



D. borealis, DC. Loosely stellate-pubescent throughout, more or le.ss cespitose ; stems 

 2 to 12 inches high: leaves ovate to oblong-ovate, flat, glabrous or pubescent, 3 to 5 lines 

 long, exceeding the pedicels ; style short and stout. — Syst. ii. 342. D. Umdaschkiana, DC. 

 1. c. 350. D. incana, var. borealis, Torr. & Gray, El. i. 107. — Alaska and adjacent islands; 

 Brit. Columbia, Rothrock ; Arctic Coast, Franklin ; Ochotsk Sea, Wright. A variety with 

 longer pedicels is found in Japan {D. Sachalinensis, Schmidt). 

 = = Cauline leaves one to three. 



D. hirta, L. Loosely stellate-pubescent : caudex branched ; stems low, usually lax : leaves 

 narrow or the cauline ovate, | to 1 inch long or less, sometimes ciliate : pods oblong-lanceo- 

 late to oblong-ovate, glabrous or sparingly pubescent, often somewhat twisted, 3 to 5 lines 

 long, usually exceeding the short pedicels ; style short and stout; stigma often 2-lobed. — 

 Syst. ed. 10, 1127; El. Dan. t. 2422; Lange, Medd. Grocn. iii. 42. D. riipestris, R. Br. in 

 Ait. f. Kew. ed. 2, iv. 91 ; El. Dan. t. 2421. D. oblongata, R. Br. in Ross, Voy. App. 143 ; DC. 

 Syst. ii. 342. D. gracilis, Ledeb. El. Ross. i. 152. — Alaska, Cape Thompson to Unalaska; 

 the Arctic Coast to Rensselaer Harbor, Kane. (Greenland, N. En., and Asia.) 



Var. arctiea, Watson. Densely tufted and more densely pubescent : leaves short ; 

 the cauline ovate : pods pubescent. — Proc. Am. Acad, xxiii. 260. D. arctiea, Vahl, El. 

 Dan. t. 2294 ; Lange, 1. c. 43. — Grinnell Land, Greelij. (Greenland, Spitzbergen.) 

 -H- -H- Stems diffusely branched above. 



D. ramosissima, Desv. Thinly stellate-pube.scent : caudex much branched ; stems slender, 

 a span high: leaves oblanceolate, laciniately toothed, acute, U to 2^ inches long: racemes 



