54 CRUCIFER^E. DRABA. 



an annual root, leafy, radical leaves ovate to ovate-oblong, petioled, 5-7 

 lines long; upper ones oblong-lanceolate to linear; racemes many-flowered, 

 strict, elongated in fruit: petals obovate, very slightly emarginate: pods nar- 

 rowly oblong, glabrous, 1-2 lines long, about the length of the pedicels; 

 valves marked with a median nerve and obscursly veined; cells 4-6 seeded. 

 Wet places. Willamette Valley (near Coburg) Oregon, and Missouri to 

 Virginia, Louisiana and Georgia. 



* * * High mountain and northern species with entire or few- 

 toothed leaves and small yellow flowers. Stigma sessile. 



D. nemorosa, L. sp. ii, 643. Pubescent with white branching hairs : 

 stem slender, 4-8 inchen high, branching from near the base, leafy: 

 leaves ovate to lanceolate, sparsely toothed: petals emarginate small, yellow: 

 pods narrowly oblong, hxlf the length of the spreading pediceli, minutely 

 pubescent. On moist grassy slopes, Oregon to the Arctic Circle and the 

 Great Lakes. 



D. lutea, Gilib. Fl. Lithuana, iv, 46. D. nemorosa var. leiocarpa Lindb. 

 Sparingly hirsute: stems very slender, often nearly or quite leafless: pedicels 

 coarsely exceeding or even shorter than the glabrous pods. In moist places 

 snd river banks, valley of the Columbia, 



I), stenoloba, Ledeb. Fl. Ross. i. 152. Stems slender, simple, or branch- 

 ing below, villous towards the base: leaves mostly subrosulate, oblong-lan- 

 ceolate or oblanceolate, mostly entire, usually more or less villous and ciliate : 

 pods linear, acute, glabrous, 4-7 lines long, equaling or exceeding the 

 spreading pedicels. Subalpine, from the Sierra Nevadas to Colorado and 

 Oregon, and northwestward to Unalaska. 



3 DRAB^A Lindb. T^innsea xiii, 318. Perennials with bran- 

 ching leafy-tufted caudcx, and soft flat not carinate leaves. 



* Scapose. Leaves entire, less than 6 lines long. Flowers yellow. 



D. Howellii, Watson, Proc. Am. Acad. xx, 354. Minutely stellate-pu- 

 bescent throughout: loosely cespitose: scapose stems about 3 inches high: 

 leaves rosulate, broadly spatulat 5 e entire or rarely obtusely toothed, 3-5 

 lines long: petals oblanceolate, obtuse, 3-4 lines long, much exceeding the 

 oval yellow sepals: pods pubescent, oblong, acute, 3-4 lines long, beaked 

 with the sender style. On high rocky ridges of the Siskiyou Mountains 

 near Preston peak" 



I). Lemmoni Watson, Bot. Cal. ii, 430. Leaves crowded at the sum- 

 mit of the stout branched caudex, broadly oblanceolate, obtuse or obtusish, 

 2 to 4 lines long with long branching hairs on the margins and loosely scat- 

 tered over the surface: scapes and corymbed pedicels pubescent with 

 spreading hairs: flowers nearly 2 lines long: pods ovate-lanceolale, beaked 

 with a very short thick style, sparingly hairy, 3 lines long, rather exceeding 

 the pedicels. Peaks of the Sierra Nevadas to the Wallowa Mountains in 

 eastern Oregon. 



D. ventosa, Gray, Am. Nat. viii, 212. Cespitose, the slender branches 

 of the caudex more or less densely leafy: leaves oblong- lanceolate, obtuse 

 or acutish, densely stellate-pubescent or glabrate: petals 1-3 lines long, 

 much exceeding the broad obtuse stellate-pubescent or glabrate sepals: 

 pods ovate to oblong-lanceolate, densely pubescent or glabrate, on ascending 

 pedicels: style short and slender. Stein Mountain southeastern Oregon to 

 northwestern Wyoming) Utah and Nevada. 



* * Scapes rarely with a single leaf : leaves entire or rarely few- 

 toothed : flowers w r hite. 



D. laeyipes DC. Syst. ii, 346. Caudex with numerous slender matted 



