28 



CUUCIFERyE. Draba. 



equal. Filaments niostly flattened, without teeth. Anthers rounded or oval. — 

 Low annual or perennial herbs ; witli entire or toothed leaves and wliite or yellow 

 flowers. 



A large genus, of nearly a lunulicd or more six^cios, mostly inhahituiits of eool climates, and 

 many al|>inn or anlic. Tlio limits of many of llm spuoics aru with tlilliuiilly (It'tim'tl, and auliior- 

 ilit'H (liller miii'li in llich' vIowh roN|i(icling lliom. 



* Annual or biennial, ivith leafi/ stems: petals nsuallt/ emanjinate. 



1. D. cuneifolia, Nutt. Hirsute-pubescent throughout with branching hairs : 

 stems usually bnincliing at base, 3 to G inches high, lealy below or i)nly at base : 

 leaves obovato or sj)atulato with a narrow or cuneate base, A to 1 inch long, spar- 

 ingly toothed toward the a{»ex : petals white, 1 Ji to 2 lines long, twice ns long as 

 the sepals : pod linear-ol^long, 3 to (i lines long, acutish, somewhat pubtiscent with 

 short ascending hairs, on spreading pedicels 1 lo 3 lines k)ng : style none. — 'I'orr. 

 & Gray, I'l. i. 108. 



Frequent e.ist of the Colorado to Texas and the Mississippi Valley. Reduied specimens were 

 collected at Los Angeles by Gambcl, and a more doubtful form by Brciccr in the Temescal Moun- 

 tains, near the tin mines. The latter specimens are scarcely an inch high, tiie leaves obovate- 

 spatulate, only two lines long and entire, the llowcrs smaller (a line long), and the young capsule 

 broader in proportion and glabrous. 



2. D. Stenoloba, Ledeb. Somewhat villous with spreading hairs, glabrous 

 above: stems erect, slender, 4 to 12 inches high, with divergent or decumbent 

 brandies from near the base : lea\'es oblanceolate, ^ to 1 inch long, rather thin, 

 acute, rarely and sparingly toothed, ciliate and slightly villous-pubescent ; the 

 cauline few and sessile: petals bright or pale yellow, 1 to U lines long, half longer 

 than the calyx, obtuse : pod linear, 3 to 5 lines long, acute at eacli end, glabrous, 

 in an elongated raceme, on spreading scattered pedicels 2 to 4 lines long : style 

 mme. — Fl. IJoss. i. 154. D. nemorusa, var. lutea, Watson, Dot. King Exp. 22. 



Dry soils in tho Sierra Nevada, at 7,000 to ]u,000 feet altitude, from Yosoniito Valley and 

 Mono I'ass (Jlrcion; (h-tii/) to Donner I'ass {Greene), and eastward in the Wahsatcli and Uintus 

 ( /r«/sL»)i) aiul Colorado. ltap]iearsto be idcntii-al with the original Unalaschkan form, it is 

 readily distinguished iVoni P. neinorosii, with whicii it has hcen confounded and which is frequent 

 in tho moiuitains from Washingtt)n Territory to ('olorado, by its thinner, narrower and more 

 entire leaves and its shorter pedicels. 



* * Biennial or j^erennial. 



+- Stems leafy. 



3. D. aurea, Vahl. Bieiniial, more or less canescently stellate-pubescfuit and 

 usually somewhat villous with braiudiing hairs : stems 3 to 18 inches high, solitary 

 or several from the same root, sim[)le or branched, leafy : leaves oblanceolate and 

 petioled, ^ to 2 inches long, tho u])per sessile and oblong to oblong-ovate, acute, 

 entire or sometimes si)aringly toothed : petals yellow turning to white, twice longer 

 than the calyx, rountled at tho apex or emarginate : pod linear-lanceolate, 4 to G 

 lines long, attenuate upward into the short style, pubendent, often somewhat 

 twisted. — Fl. Dan. t. 14G0. Hook. Lot. iMag. t. 2934. 



In the Rocky Mountains fiom Colorado to British America. Specimens collected by Brewer 

 on Mt. Dana at 12,000 feet altitude, anil by Leniinon farther north in the Sierra Nevada, must 

 apparently be referred here though they have more of a nerennial habit than is usual in tho spe- 

 cies. Their basal leaves are densely crowded, and tho wliole plant, including the pods, densely 

 stellate-pubescent. 



+- +- Stems naked and scape-like above the base, few-Jiowered. 



4. D. crassifolia, Graham. Biennial or i)erennial (sometimes apparently annual), 

 glabrous : stems slender, 1 to 5 inches high, solitary or few from a very short and 

 nearly simple rootstock : leaves rosulate, thin. Hat, narrowly oblanceolate or linear, 

 ^ to 1 inch long, rarely with 1 or 2 lateml teeth, more or less ciliate with long hairs : 



