Voi,. II.] 



MUSTARD FAMILY 



3. Lesquerella argentea (Pursh) 



MacM. Silvery Bladder-pod. 



(Fig. 1747.) 



Myagrum argenteum Pursh, Fl. Am. Sept. 434. 



1814. 



Vesicaria argentea DC. Syst. 2: 297. 1821. 

 Lesquerella Ludoviciana S. Wats. Proc. Am. 



Acad. 23: 252. 1888. 

 Lesquerella argentea MacM. Met. Minn. 263. 



1892. 



Biennial or perennial, tufted, nearly sim- 

 ple, 6 / -i8 / high, densely stellate-pubescent 

 throughout. Leaves linear, oblong or ob- 

 lanceolate, the lower 2 / ~3 / long, blunt, entire 

 or sparingly repand-toothed; flowers yellow; 

 petals 3" long; pedicels slender, 8 // -i2 // long 

 in fruit, spreading or recurved; pod slightly 

 stipitate, stellate-pubescent, globose to oval, 

 2 // -2^ // long; style about equalling the pod. 



Prairies, Minnesota, Nebraska and Kansas, 

 west to Dakota and northern Arizona. May-June. 



4. Lesquerella gracilis (Hook.) S. 



Wats. Slender Bladder-pod. 



(Fig. 1748.) 



Vesicaria gracilis Hook. Bot. Mag. pi. JSJS- 



1836. 

 Lesquerella gracilis S. Wats. Proc. Am. Acad. 23: 



253. 1888. 



Weak, green, stem slender, io / -2O / high, 

 freely branching, sparsely stellate-pubescent. 

 Leaves linear or oblanceolate, the lower slightly 

 petioled, the upper sessile, 9 // -2 / long, their 

 margins often undulate; flowers yellow; petals 

 about 3" long; pedicels spreading, sometimes 

 i' long in fruit, ascending or upwardly curved; 

 pod globose, glabrous, 2 // in diameter, stipitate 

 at the end of the pedicel; style 2 // long; seeds 

 several in each cell. 



Prairies, Nebraska to Texas. March-May. 



5. Lesquerella ovalifolia Rydberg, n. 



sp. Oval-leaved Bladder-pod. 



(Fig. 1749.) 



Perennial from a tufted caudex, pale, densely 

 stellate-canescent. Basal leaves tufted, broadly 

 oval to obovate, sometimes nearly orbicular, 

 entire, obtuse or subacute, i / -2 / long, narrowed 

 into rather long petioles; stem-leaves distant, 

 sessile, or the lowest short-petioled, linear-ob- 

 lanceolate or narrowly spatulate; fruiting pedi- 

 cels comparatively stout, ascending, 6 // -io // 

 long; pods very short-stipitate, subglobose, ob- 

 tuse, 2>^ // -3 // in diameter, glabrous; style about 

 3" long; seeds about 6 in each cell. 



In dry soil, Kimball Co., Neb. (Rydberg, no. 22, 

 1891). This has been confounded with 



Lesquerella Engelmanni (A. Gray) S. Wats., of 

 Texas and Colorado, said to occur in western Kan- 

 sas. It differs in the simpler and taller (12' -i 8' ) 

 habit and narrower ovate or oblong leaves. 



