254 PROCEEDINGS OF THE AMERICAN ACADEMY 



compressed in one species, and somewhat so toward the apex in a few 

 others ; obcompressed in some doubtful species. Vesicaria, Auct., as 

 to American species, excluding Physaria. 



Lesquerella. Arizonica. Dwarf densely cespitose multicipital 

 perennial, with compact finely stellate or lepidote pubescence : leaves 

 narrowly oblanceolate, entire : flowers rather large, the sepals 2 J lines 

 long or less ; petals with a very broad undulate claw, rounded above : 

 pods broadly ovate, somewhat compressed, acute, pubescent, sessile, 

 the cells 4-ovuled ; style a line long or more. — Arizona ; near Pres- 

 cott (16 Palmer, 1876), near Williams Station (4188 Lemmon), at 

 Peach Springs (4177 Lemmon, 64 Jones), and at Mokiak Pass (43 

 Palmer, 1877). 



= = Biennial or usually perennial (often fruiting the first year) : pods sessile, 

 or nearly so, on ascending or spreading pedicels. 



«*> Pubescence evidently stellate. 



29. L. Engelmanni. Pubescence dense ; caudex usually much branched ; 

 stems often dwarf, usually simple : leaves ovate and petiolate to linear-oblanceo- 

 late, or the upper linear-spatulate, entire or slightly repand : raceme usually 

 short : pods substipitate, 3 lines broad ; style as long ; cells 6-8-ovuled. — 

 V. Engelmanni, Gray. Central Texas to western Kansas and southeastern 

 Colorado. 



30. L. argyrea. Pubescence more or less dense ; caudex often simple 

 and apparently annual; leafy stems decumbent or procumbent : leaves ovate 

 and petiolate to narrowly oblanceolate, entire or repand ; petals often turning 

 purple : pods sessile, in a long raceme, 2 to 2\ lines broad ; style as long or 

 shorter ; cells 6-10-ovuled. — V. argyrea, Gray. Southwestern Texas and north- 

 eastern Mexico. 



un un Pubescence compactly lepidote, rarely evidently stellate. 



31. L. arctica. Caudex and stems usually simple, low : leaves spatulate or 

 narrowly oblanceolate, entire : pods 2| to 3 lines broad ; style a line long or 

 less ; cells 6-ovuled; septum perforate. — V. arctica, Richards. West Greenland 

 and Arctic Coast to the Mackenzie River. 



Var. Purshii. Pod somewhat pubescent; septum complete. — Anticosti 

 Island (Shepherd, Macoun) ; "Canada" (Pursh, in Herb. Torr.). 



32. L. Fendleri. Usually evidently perennial and caudex much branched, 

 often dwarf; stems simple : leaves numerous, entire, mostly narrowly linear- 

 oblanceolate : pods in a dense usually short raceme, 2 or 3 lines long, sometimes 

 ellipsoidal or acutish ; style usually as long ; cells 10-16-ovuled. — V. Fendleri 

 and V. stenophylla, Gray. Western Texas and southern Colorado to Arizona 

 and northern Mexico. 



33. L. Schaffneri. Caudex simple ; stems ascending or decumbent : 

 leaves linear- to oblong-oblanceolate or spatulate, entire or repand : petals 

 turning purple : pods subovate, 1£ to 2| lines long ; style half as long ; cells 

 6-ovuled.— V. Schaffneri, Watson, Proc. Am. Acad. 17. 320. San Luis Potosi, 

 Mexico. 



