MUSTARD FAMILY 325 



Plants branched near the base; petals usually present (except in L. diver- 



Raceme's usually numerous, on short branches from the axils of the upper 



leaves; pods broadest below the middle; wing-margins narrow. 

 Axillary racemes very short and dense, usually shorter than the 



leaves; petals more than half as long as the sepals. ^ , 



21. L. ramostssinuim. 



Axillary racemes at last elongate; petals very mimite or lacking. 



22. L. divcrgens. 



Racemes elongate, terminal; pods broad&st above the middle; wing- 

 margins fully 0.5 mm. wide at the apex. 23. L, elongatum. 



Plant simple below, branched above; petals none; racemes elongate, 

 terminal. 24. L. denstflorum. 



Pods hirsute, at least on the margins. - «^ x i. ™ 



Stem-leaves Unear. mostly entire. 25. L. pubecarpum. 



Stem-leaves spatulate. toothed or laciniate. 26. L. oeorginurn. 



Wing-margins of the fruit produced at the apex into acute lobes or teeth. ^ 

 Stem erect, 3-5 dm. high. . 27. L. Fleicheru 



Stem decumbent, 3-15 cm. high. ^. ,. ^ , 4. 



Pod obovate or eUiptic; stamens 2; leaves Imear or Imear-spatulate. 



Pod ovate; stamens 4; basal leaves often pinnatifld. 29. L. diciyolum. 



1. L. perfoliatum L. Annual or biennial; stems suberect, 2-4 dm. high, 

 more or less pilose; lower leaves bipinnatifid into linear divisions; upper stem- 

 leaves entire, cordate or reniform, clasping, glabrous; petals yellow, fully 1 mm. 

 long; stamens 6; pod 4 mm. long, orbicular, broadly ovate, or rhombic-elliptic, 

 slightly emarginate; style about equalling the width of the wmgs. W aste places : 

 Utah; nat. from Eu. My-Je. 



2. L. sativum L. Glabrous, bright green annual; stem 3-5 dm high, 

 branched; lower leaves twice pinnate, 5-20 cm. long, with obovate or oblanceo- 

 late, toothed divisions; petals spatulate, white or pinkish, 2 mm. long; stamens 

 6; pod obovate, 5 mm. long, glabrous, strongly winged above, emarginate; wing 

 partly adnate to the style. Waste places: Que.— N.Y.— Mont.— B.C.; escaped 

 from gardens, native of Eu. Plain— Submont. My-Au. 



3. L. integrifolium Nutt. Stems few, 2-5 dm. high, simple below, gla- 

 brous; leaves entire, fleshy; petals 2.5 mm. long, obovate; pod 4-5 mm. long, 

 elliptic; style scarcely 1 mm. long. L. utahense Jones. L. Zwms A. JNels. 

 Plains: Wyo. — s Wash. — ^Ariz. Son. Je. 



4. L. Vaseyanum Thellung. Fruticose at the base; stems 2-4 dm. high, 

 glabrous; lower leaves cuneate, 2-10 cm. long, the upper oblanceolate, entire, 

 glabrous; petals clawed, 2 mm. long; pod ovate, 3-3.5 mm. long; style about U.5 

 mm. long. L. spathulatum Vasey, not Phil. Mountains and hiUs: ^olo.—vf 

 Tex. — N.M. Son. Je-S. 



5. L. crenatum (Greene) Rvdb. Stem 5-9 dm. high, glabrous, simple; basal 

 leaves 5-15 cm. long, petioled; upper stem-leaves sessile and more entire; petals 

 short-clawed, 3 mm. long; pods ovate, 3-4 mm. long; style about twice as long as 

 the wing-margins. Thelypodium crenatum Greene. Sage plains: Lolo. ^on. Ji. 



6. L. scopulonim M. E. Jones. Somewhat woody at the base; stems 

 several, rather simple, glabrous, 1.5-3 dm. high; leaves coriaceous, glabrous, 

 shining, with broad, obovate, entire or round-toothed divisions; petals flawed, 

 2 mm. long; pod 3 4 mm. long, ovate; style 1 mm. long. Mountains: btan 

 Ariz.— (? Wyo.) Submont.— Mont. Jl-Au. 



* 7. L. Crandallii Rydb. Stems several, branched and leafy throughout, 

 glabrous or puberulent above, 3-5 dm. high; lower leaves pinnatifid, W cm. long, 

 glabrous, with oblanceolate or oblong, entire or slightly toothed divisions; upper 

 stem-leaves oblanceolate or linear, entire or toothed; petals clawed, about ^ 

 mm. long, white; pods oval or ovate, about 4 mm. long, glabrous, slightly win„- 

 margined above; style 1 mm. long. Valleys: Colo. Svbmont. My-Je. 



8. L. montanum Nutt. Stems often several from the same root, 2-4 dm. 

 high, more or less puberulent or hirsutulous; lower leaves bipmnatihd,^atn oDiong 

 or obovate divisions, the upper pinnatifid or toothed; petals clawed 2 mm. long, 

 -pod ovate, 3-3.5 mm. long; stvle about 0.75 mm. long. (?) L.vJ^tlomtrum^eX^. 

 & Macb. Plains: Wyo.— N.M.— Calif.— Ida.; Mex. Son.— Mont. My-b. 



