OF THE WASATCH REGION 31 



2. L. Draba L. Hoary Cress. Perennial, 10-18 inches high; 

 hoary-pubescent. Stem simple below, few-branched at the 

 inflorescence. Leaves bluish -green; 2 inches or less in length; 

 the lower petioled, lanceolate, obtuse; the upper sagittate, 

 merging into bracts. Racemes corymbose. Pods broadly 

 ovate; winged. In waste places. April-June. Introduced. 



3. L. montanum Nutt. Decumbent (or rarely erect) and 

 radially much -branched from a somewhat woody root. All the 

 leaves more or less deeply toothed or pinnatifid, the segments 

 obovate or broadly oblanceolate (very rarely entire). Sepals 

 not falling off before the white and very conspicuous petals. 

 Styles conspicuous. Capsules indistinctly netted; wingless; 

 elliptical-ovate to nearly round; emarginate at apex. Dry hills 

 and mountain valleys. April-August. 



3a. L,. montanum alyssoides Jones. (L. Jonesii Rydberg.) 

 Distinguished from th.e type by the simple stem at base and 

 by the linear segments of the basal leaves. 



4. L. virginicum L. Erect, 8-24 inches high; simple below, 

 branched at the inflorescence. Basal leaves pinnate or pin- 

 natifid, usually withering before the fruit ripens; obovate or 

 spatulate in outline, the terminal segment much the largest. 

 Pedicels slender, widely spreading. Siliques round; smooth; 

 often purple-tinged at maturity. Seeds wing-margined; coty- 

 ledons accumbent. In moist situations. May-November. 



5. L. medium Greene. (L. intermedium Gray.) Erect 

 annual with stems simple below, branched above; glabrous or 

 nearly so. Leaves glabrous; lanceolate, dentate, but scarcely 

 ever pinnatifid; those of the branches linear and entire. 

 Siliques not shining. Stigma sessile. Cotyledons incumbent. 

 In moist places near streams. May-October. 



6. L. apetalum Willd. (L. elongatum Rydb.) Erect annual 

 wicxi stem simple below and more or less branched above; 

 glabrous or nearly so. Basal leaves more or less incisely 

 toothed or pinnatifid; segments usually acutish. Flowers 

 apetalous. Stamens 2. Silique glabrous. 'Includes L. densi- 

 florum Schrader.) In dry soil in waste ground. May-June. 



7. L,. divergent Osterhout. A much -branched biennial; 

 minutely pubescent. Basal leaves short-petioled; broadly 

 spatulate, more or less dentate; those of the stem smaller and 

 mostly entire. Flowers borne on horizontal pedicels in long 

 racemes. Petals none. Silique elliptical; glabrous. Dry soil 

 of waste places, at rather high elevations. June-August. 



8. L. lasiocarpum Nutt. Decumbent, branching from near 

 the base; hirsutely white- pubescent. Lower leaves pinnately- 

 parted. with sparingly toothed or entire segments. Sepals 

 iisually purple, with thin white margins. Petals usually lack- 

 ing. Silique suborbicular; thin-margined near the apex; hispid- 

 pubescent upon both sides or at least upon the edge (very 

 rarely quite smooth.) Includes L. Wrightii A. Gray.) Dry 

 soil in waste places. May-June. 



9. Li. pubecarpum A. Nelson. Annual, 4-6 inches high; stem 

 (and branches in well-developed plants) paniculately branched 

 from near the base; obscurely puberulent. Leaves small; linear 

 to somewhat spatulate, acute; the broader ones remotely cut- 

 toothed. Sepals purplish. Petals none. Stamens 2. Siliques 

 permanently finely pubescent; from broadly oval to round. 

 Stigma sessile in the narrow, shallow notch. In rather moist 

 places along mountain streams. May-July. 



