326 BRASSICACEAE 



9. L. papilliferum (Henders.) Nels. & Macbr. Biennial; stem intricately 

 branched, 1-2 dm. high, bushy; leaves pinnatifid, with oblong, acute divisions, 

 2-4 cm. long; raceme short and dense; petals white, twice as long as the sepals; 

 pedicels in fruit spreading or recurved; pod suborbicular, notched at the apex, 

 3 mm. long, slightly papillose; style 0.6 mm. long. L. rnontanum papilliferum 

 Henders. Sage-brush plains: Ida. Son, My-Je. 



10. L. brachybotryum Rydb. Stem 2-3 dm. high, branched, puberulent 

 throughout; basal leaves puberulent, bipinnatifid, with elliptic or obovate lobes; 

 stem-leaves oblanceolate, pinnatifid or toothed; petals white, clawed, 2 mm. 

 long; fruiting racemes short; pod rounded-ovate, 3 mm. long, wing-margined 

 above. Dry valleys: Utah. Son, Je~Jl. 



11. L. alyssoides A. Gray. Stems usually several, 2-5 dm. high, corym- 

 bosely branched, puberulent above; lower leaves pinnatifid with linear divisions, 

 glabrous; upper leaves entire, narrowly linear; petals distinctly clawed, 2-3 mm. 

 long; pod ovate, rarely oval or elliptic, about 4 mm. long; stjde about 0.5 mm. 

 long. Plains and river valleys: Tex. — Ariz.— Utah — Colo. Son, Ap-S, 



12. _L. Jonesii Rydb. Perennial, with a short woody caudex; stems 2-3 

 dm. high, branched, glabrous; lower leaves pinnatifid with linear acute 

 divisions; upper leaves entire, narrowly linear; racemes rather short and dense; 

 petals white, about 3 mm. long, much exceeding the sepals; stamens 6; pod 

 oval, about 4 mm. long" and slightly over 2 mm. wide, glabrous, retuse; style 

 about 1 mm. long. Dry places: Utah — Nev. Son.-^Siibmont, Ap-Je, 



13.^ L. Eastwoodiae Wooton. Perennial, with a woody base; stems 5-10 

 dm. high, cor^^mbosely branched above; lower leaves 3-5 cm. long, pinnately 

 divided, with oblong acute divisions; upper cauline leaves oblong-] anceolate to 

 linear, usually entire; racemes short and crowded; petals elliptic, white, 3 mm. 

 long, clawed; pods elliptic-ovate, emarginate. In rocky places: N.M. — Utah. 

 Submont, Je. 



14. L. Fremontii S. Wats. Shrubby below, 3-10 dm. high; stem glabrous 

 and shining; lower leaves glabrous, pinnatifid, with linear divisions, the upper 

 entire, linear, more or less fleshy; petals clawed, 3 mm. long; blades rhombic- 

 obovate; pods 5-7 mm. long and fully as broad, orbicular or obcordate, scarcely 

 winged; style 0.5-0.7 mm, long. Rocky and arid ground: Utah— Ariz.— CaUf. 

 L. Son, Ap-Je. 



15. L. idahoense Heller. Stem 2-5 dm. high, sparingly and minutely 

 pubescent, simple below, branched above; basal leaves spatulate, coarsely toothed 

 or pinnatifid; lower stem-leaves oblanceolate, laciniately dentate, the upper 

 linear and entire; petals white, clawed, about 2 mm. long; pod orbicular, about 

 3 mm. long. River banks, canons, and foot-hills: Ida. — Colo. Son, — Submont, 

 My-Je. 



16. L. virginicum L. Annual or biennial; stem erect, more or less pubes- 

 cent, leafy, corymbosely branched above; basal leaves lyrate-pinnatifid, more or 

 less hirsute; lower stem-leaves oblanceolate, incised, the upper narrower, remotely 

 dentate; petals claw^ed, about 1.5 mm. long; stamens 2-6; pod suborbicular, 3 

 mm. long, winged above, with rounded lobes. Waste places, fields, and road- 

 sides; Que.— ria.— Tex.— Utah; Mex., W. Ind., C. Am., S. Am.; naturalized 

 m the Old World. Plain—Subinont, Ja-D. (in the Rockies, My-Au). 



17. L. texanxun Buckl. Annual; stems glabrous or nearly so, 3-5 dm. 

 high; branched above; lower leaves obovate or oblanceolate, somewhat pubes- 

 cent, coarsely toothed; upper stem-leaves linear, mostly entire, glabrous and 

 shmmg; petals shghtly more than 1 mm. long; stamens mostly 2; pod orbicular, 

 3 mm. long, narrowly wing-margined above. L, intermedium K, Gray. L, 



medium Greene. Sandy soil: Mo.— Ala.— Tex,— Calif.— B.C.; Mex. Son. 

 Ap-Au. 



18. L. hirsutum Rydb. Annual or biennial; stem strict, 3-5 dm. high; 

 lower leaves lyrately pinnatifid, with broad, toothed lobes, densely hirsute; 

 upper leaves oblanceolate, coarsely and saliently toothed; petals white,! mm. 

 long, clawed; stamens usually 2; pod rounded-oval. 3-3.5 mm. long. L. inter- 



