Dentaria. CRUCIFERJE. 29 



petals yellow, about a line long, a little exceeding the calyx : pods lanceolate, acute 

 at each end, 3 to 4 lines long, on pedicels nearly as long, in an elongated raceme ; 

 style none. — Torr. & Gray, FL i. 106. D. Johannu, Gray, Am. Jour. Sci. xxxiii. 242. 

 At Pcregoy's, above Yosemite Valley, at 7,000 i'eet altitude, Gray. Rather frequent in the 

 Rockv Mountains from Colorado to lat. 57°. Near D. lactca (referred to D. and rosacea), but less 

 cespitose and without the short style which is found in that species. 



5. D. Douglasii, Gray. Glaucous : scapes numerous from a much-branched 

 leafy caudex, pubescent, \ to 1' inches high, corynibosely flowered : leaves below 

 ovate, the uppermost obovate or spatulate, 1 to 2 lines long, entire, glabrous or some- 

 what pubescent with simple hairs, hispidly ciliate : petals white, 2 lines long, exceed- 

 ing the rather fleshy nearly glabrous broad and obtuse sepals: pod ovate-oblong, 

 acutish at each end, beaked with the slender style, puberulent, 2 lines long ; cells 

 2-ovuled. — Proc. Am. Acad. vii. 328 ; Watson, Bot. King Exp. 22. 



South of Carson City, Nevada (Anderson); on Mount Da%ddson (Watson); Sierra Valley 

 (/.. n n) ; and by Douglas, probably still farther to the north. 



G. D. eurycarpa, Gray. Tomentose with stellate hairs: scapes few-tlowered, 1 

 to 2 inches high : leaves rosulate, spatulate, entire, 4 to 8 lines long : pod ovate, 5 

 to 10 lines long, acute and beaked with the long slendsr style ; ovules rather 

 numerous in each cell. — Proc. Am. Acad. vi. 520. 



On a dry summit near Sonora Pass, at 11,500 feet altitude, Brewer. Known only from fruit- 

 ing specimens that have shed their seeds. 



7. D. alpina, Linn. Densely cespitose and much branched, more or less stel- 

 lately pubescent and villous : scapes I to 6 inches high : leaves crowded at the base, 

 spatulate or oblanceolate, 2 to 9 lines long, ciliate, not carinate : flowers large, yellow ; 

 petals l. 1 , to 2. 1 , lines long, much exceeding the broad obtuse sepals : pod ovate to 

 oblong-elliptical, 2 to 3 lines. long, acute and beaked with the short thick style ; 

 cells 4-lO-ovuled. — Kegel, Fl. OstSib. i. 181 ; Watson, 1. c. 20. 



Yar. algida, Kegel. Pubescence villous, not stellate : leaves mostly small and 

 spatulate, strongly ciliate, not carinate : style slightly longer. — Fl. Ost-Sib. i. 183. 

 L). algida, Adams; DC. Piodr. i. 107. 



Var. glacialis, Dickie. Dwarf: leaves more rigid, linear or narrowly ohlainvn- 

 late, more or less strongly carinate, and stellate-pubescent, not ciliate : pod short- 

 ovate, pubescent. — Jour. Linn. Soc. xi. 33. D. glacialis, Adams, 1. c. 



The typical Old World form, which occurs also in Greenland, has rather large and broad leave*, 

 n.it carinate, slightly stellate-pubescent, ciliate, the scape and pedicels somewhat hairy; pod 

 ovate, smooth, beaked with a snort style. This has not been collected in California, though forms 

 nearly approaching it are found in the mountains east and northward. Var. - ' > < • on airs on Mt. 

 Hana and other peaks about the head of the South fork of King's Uiver, at 13,000 feet altitude 

 (£n wer), and in the Vnintah .Mountains i Watson), as well as on the arctic Coast. Var. glacialis 

 is somewhat common on high peaks in the Sierra Nevada, and in the mounl tins eastward. A still 

 more extreme form is found on the dry summit of Silver .Mountain at 11,000 feet altitude (JS 

 and in the East Humboldt .Mountains, Nevada (Watson) ; very dwarf and densely cespitose; the 

 very short linear leaves appressed, strongly carinate and ciliate, but otherwise glabrous ; the short 

 ii apes and small orbicular pods hirsute. 



4. DENTARIA, Linn. 



Pod linear, stout, with a thickened margin, and attenuate above into the elongated 



style; valves Hat, nerveless. S Is in one row, turgid, wingless; cotyledons peti- 



oled, the margins somewhat infolding each other. Sepals equal. Petals large, long- 

 clawed, white or purplish. — Low perennials, glabrous or nearly so; stems simple, 

 from horizontal fleshy rootstocks or small tubers, usually with 1 or 2 long-petioled 



e pound radical leaves ; cauline leaves 2 <>r 3, approximate near the top, petioled, 



simple or compound ; raceme short, few-flowered. 



