252 PROCEEDINGS OP THE AMERICAN ACADEMY 



ginless or rarely narrowly margined. Cotyledons accumbent. — Low 

 caulescent annuals or perennials, with stellate often dense or white- 

 long, the style a line long ; cells 4-ovuled. — V. Montevidensis, Eichl. Fl. Bras. 

 IS 1 . 802, t. 67, f. 2. Brazil ; the only South American species. 



++++++ Pods elliptical, somewhat obcompressed, acute or obtuse, erect on 

 spreading pedicels : pubescence compactly lepidote. Arizona and Mexico. 

 (Abnormal species.) 



12. L. (?) Wardii. See page 255. 



13. L. (?) cinerea. See page 255. 



14. L. (') argentea. Leaves oblanceolate to spatulate, toothed or entire : 

 pods elliptical, obtuse, 3 lines long; style a line long; cells 6-8-ovuled. — 

 V. argentea, Schauer, Linnsea, 20. 720. Mexico. 



•*- -<- Pods globose, or nearly so, and obtuse (acutish in n. 15). 



*+ Annual or sometimes biennial. Southern. 



15. L. globosa. Pubescence dense, evidently stellate; stems slender, often 

 branched : leaves oblong-spatulate to linear-oblanceolate above, entire or spar- 

 ingly toothed : pods on wide-spreading pedicels, a line in diameter ; style longer; 

 cells 2-ovuled. — V. globosa, Desv. V. Shortii, Torr. Tennessee to eastern 

 Missouri. 



16. L. Berlandieri. Pubescence often somewhat sparse ; stems slender, 

 often branched : leaves ovate-lanceolate to oblanceolate, lyrately pinnatifid be- 

 low, repandly toothed above : pods globose or ellipsoidal, 1^ to 2j lines long; 

 style as long ; cells 4-6-ovuled. — V. Berlandieri, Gray in herb. Near Matamoras 

 and at San Fernando, Tamaulipas (Berlandier). 



17. L. Palmeri. See page 255. 



++ Biennial or sometimes perennial. Northern. 



18. L. Ludoviciana. Pubescence evidently stellate or compact below; cau- 

 dex and stems usually simple : leaves narrowly oblanceolate to linear, mostly 

 entire : pods pendulous on the recurved pedicels, 1^ to 2^ lines long ; style about 

 as long; cells 4-6-ovuled. — V. Ludoviciana, DC. Minnesota and central Dakota 

 to Nebraska and northeastern Colorado ; northern Arizona [Palmer). 



Var. arenosa. Low and very slender, with shorter narrow leaves. — V. 

 arenosa, Rich. V. arctica, Hook. Bot. Mag. t. 2882. Saskatchewan region. 



19. L. Douglasii. See page 255. 



* * Ovary and pod glabrous (or pubescent in nos. 27 and 31), not at all 



compressed. 

 +- Pods oblong or pyriform, substipitate, on long ascending pedicels. Arkansan 



annuals. 



20. L. repanda. Pubescence finely and usually sparingly lepidote-stellate : 

 leaves from lyrately pinnatifid to linear-spatulate and entire : ovary oblong, 

 acutish, somewhat narrowed to a very short stipe ; style about as long ; cells 

 4-ovuled (mature fruit unknown). — V. repanda, Nutt. Banks of Red River 

 [Leavenworth). 



21. L. Nuttallii. Like the last, but radical leaves and flowers unknown : 

 pods broadly pyriform, somewhat constricted above the abrupt base, 2£ lines 



