Dentaria. CRUCIFER^. 



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. lOG. D. Johannis, Gray, Am. Jour. Sci. xxxiii. 2-42. 

 At Peregoy's, above Yosemite Valley, at 7,000 feet altitude, Gray. Rather frequent in the 

 Rocky Mountains from Colorado to lat. 57°. Near D. lactca (referred to D. androsacca), but less 

 cespitose and without tlie 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, corymbosely tiowered : 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 Davidson ( Watson) ; Sierra Valley 

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



6. D. eurycarpa, Gray. Tomentose with stellate hairs : scapes few-flowered, 1 

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

 to 10 lines long, acute and beaked with the long slender 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 ^ to 6 inches high : leaves crowded at the base, 

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

 petals IJ to 2| 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- 10-ovuled. — Eegel, Fl. Ost-Sib. i. 181 ; Watson, 1. c. 20. . 



Var. algida, Eegel. Pubescence villous, not stellate : leaves mostly small and 

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

 D. algida, Adams; DC. Prodr. i. 1G7. 



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

 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 leaves, 

 not carinate, slightly stellate-pubescent, ciliate, the scape and pedicels somewhat hairy ; pod 

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

 nearly approaching it are found in the mountains east and northward. Var. algida occurs on Jit. 

 Dana and other peaks about the head of the South Fork of King's River, at 13,000 feet altitude 

 {Brewer), and in the Yuintah Mountains ( JFatson), as well as on the Arctic Coast. Var. glacialis 

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

 more extreme form is found on the dry summit of Silver Mountain at 11,000 feet altitude {Brewer) 

 and in the East Hunilmldt .Mountains, Nevada {JFatson) ; very dwarf and densely cespitose; the 

 very short linear leaves ii[iiiri'sscd, strongly carinate and ciliate, but otherwise glabrous ; the short 

 scapes and small orbicular pods hirsute. 



4. DENTARIA, Linn. 



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

 style ; valves flat, nerveless. Seeds in one row, turgid, wingless ; cotyledons peti- 

 oled, the margins somewhat infolding each other. Sepals ecpial. Petals largo, 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-i)etit)leil 

 compound radical leaves ; cauline leaves 2 or 3, approximate near tlie top, petioled, 

 simple or compound ; raceme short, few-flowered. 



