22 BOTANY. 



description and from each other, and may be distinct, some or all of them. 

 Some, however, agree well with Lapland specimens of D. nivalis, Lilj., (refer- 

 red to this species,) from Anderson, in Herb. Gray. All have glabrous naked 

 scapes and silicles, with small obovate pubescent leaves ; otherwise they may 

 be thus divided : (a) with very slender 1-3-flowered scapes, 2' long ; flowers 

 small, petals half longer than the calyx ; silicle linear-oblong, (3-4" long,) with 

 a short style ; {b) wii,h shorter scape, and style none ; (c) with ovate silicles, 

 acuminate with a longer (J") style, (a) and (6) are from the same locality 

 in the Uinta Mountains; 12,000 feet altitude; August; (c) from the East 

 Humboldt Mountains, Nevada ; 10,000 feet altitude ; September. (90.) 



Dkaba Douglasii, Grray. Proc. Amer. Acad. 7. 328. Caudex with 

 numerous short stems ; scapes naked, corymbosely many-flowered ; leaves all 

 rosulate, subcartilaginous, nearly veinless, entire, glabrous or somewhat hirsute 

 (as also the scape) with simple hairs, hispidly ciliate, the lowest ovate, the 

 upper ones obovate or spatulate ; flowers rather large, white, with oval 

 glabrous sepals; silicles ovate, pub erulent, beaked. with the slender style ; 

 cells 2-ovuled near the summit. — A low csespitose perennial ; scapes an inch 

 in height. Collected by Douglas in Northern California or Oregon, and by 

 Anderson in the Sierras south of Carson City. Mount Davidson, Nevada; 

 6,000 feet altitude ; April, in flower only. (91.) 



Dkaba aueea, Vahl. Pubescent ; stem erect, leafy; leaves lanceolate or 

 ovate-lanceolate, acute, entire or toothed ; corymbs terminal and axillary ; 

 silicles oblong-lanceolate, pubescent, exceeding the pedicels ; petals (yellow, 

 or sometimes white) emarginate ; style rather short. — Biennial or perennial ; 

 stems few in young plants, becoming many. The specimens have simple 

 racemes, resembling those collected in Colorado and by Bourgeau. Found 

 in the Eocky Mountains, from New Mexico to British America. Uinta 

 Mountains, Utah ; 8-11,000 feet altitude; August. (92.) 



Dkaba nemorosa, L. In the Rocky Mountains, from Colorado to the 

 Arctic Circle and the northwest coast. Frequent in the Wahsatch Moun- 

 tains, Utah ; 4,500-8,500 feet altitude ; May-July. (93.) 



Var. LUTEA, G-ray. (J), lutea, D C.) Often with the stem nearly or quite 

 leafless, and the petals sometimes pinkish-white; the sepals are sparsely 

 hirsute ; the pedicels scarcely exceed or are even shorter than the silicles. 

 Similar specimens collected in Colorado have been considered D. crassifolia, 

 Grab., but it is evidently a form of the last — more alpine. In the East Hum- 



