OF ARTS AND SCIENCES. 253 



lepidote pubescence, and entire or repandly toothed leaves. Flowers 

 yellow (white or rose-colored in one or two species). Pods much 



long, shortly stipitate; style 1 or 2 lines long; cells 6-8-ovuled. — V. Nuttallii, 

 Torr. & Gray. Prairies of Red River (Leavenworth). 



+- h- Pods globose. Southwestern, except n. 31. 



++ Pods pendent on recurved pedicels, sessile or scarcely stipitate. 



= Flowers white or rose-colored. 



22. L. purpurea. Biennial or perennial, the caudex simple or branched ; 

 pubescence fine, scattered, or more or less compact on the lower leaves : leaves 

 oblanceolate, the lower often coarsely repand or subpinnatifid : pods rarely 

 ascending, 1$ to 3 lines broad ; style a line long or less ; cells 2-G-ovuled. — 

 V. purpurea, Gray. Western Texas to Arizona and northern Mexico. 



23. L. pallida. Annual, finely and rather sparingly scurfy : leaves oblan- 

 ceolate, repand: pods shortly stipitate, 2 lines broad; style a line long; cells 

 6-ovuled. — V. pallida, Nutt. San Augustin, eastern Texas (Leavenworth). 

 Perhaps a form of the next. 



= = Flowers yellow. 



24. L. recurvata. Annual, thinly pubescent : leaves entire, oblong-oblanceo- 

 late or -spatulate, short: pods sessile, 1 or 2 lines broad ; style about as long; 

 cells 2-4-ovuled. — V. recurvata, Engelm. V. angustifolia, Scheele, in part. 

 Central Texas. 



++ ++ Pods suberect on ascending or curved pedicels. 



= Annual (rarely biennial?), usually branched : pods often stipitate. (Very 



closely allied species.) 



25. L. Lindheimeri. Pubescence very fine or compactly lepidote ; stems 

 erect or ascending : leaves oblong- to narrowly oblanceolate, repand or dentate : 

 pods 2 lines broad ; stipe short ; style rather shorter than the pod ; cells 

 6-8-ovuled. — V. Lindheimeri, Gray. Texas. 



26. L. gracilis. Pubescence very fine, usually scanty ; stems slender and 

 usually lax: leaves narrowly oblanceolate, entire or sparingly repand: pods 

 stipitate, 1£ or 2 lines broad, on slender often elongated pedicels ; style nearly 

 or quite as long ; cells 4-6-ovuled. — V. gracilis, Hook. V. polyaniha, Schlecht. 

 Central Texas to Kansas. 



Var. sessilis. Pods sessile. — V. angustifolia, Gray, PI. Wright. 2. 13, in 

 part. Texas (848 Wright; 326 Lindheimer ?). 



27. L. Gordoni. Pubescence somewhat coarser; often low : leaves linear- 

 oblanceolate, entire or rarely repand : pods stipitate, 2 lines broad ; style shorter ; 

 cells 6-ovuled. — V. Gordoni, Gray. Extreme western Texas to New Mexico 

 and Arizona. Very near the last. 



Var. sessilis. Pods sessile or nearly so and often pubescent. — V. angustifolia, 

 Gray, 1. c. in part. Same range. 



28. L. angustifolia. Finely lepidote : lower leaves lyrate-pinnatifid, the 

 cauline narrowly linear and petiolate : pods sessile, 2 to 2| lines broad ; style 

 somewhat shorter ; cells 2-ovuled. — V. angustifolia, Nutt. Prairies of Red River, 

 Arkansas (Leavenworth, Nuttall). 



