CRUCIFERAE. 



Vol. II. 



5. Lesquerella ovalifolia Rydb. Oval- 

 Icavcd J!laddcT-pO(l. I''ig. 2017. 



Lesquerella ovalifolia Rydb. ; Britt. & Brown. 111. Fl. 

 2: 137. 1897. 



Perennial from a tufted caiidcx, pale, densely 

 stellate-cancsccnt. 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- 

 lanccolate or narrowly spatulate; fruiting pedi- 

 cels comparatively stout, ascending, 6"-io" long; 

 pods very short-stipitate, subglobose, obtuse, 2i"- 

 3" in diameter, glabrous; style about 3" long; 

 seeds about 6 in each cell. 



In dry soil. Nebraska, Kansas and Colorado. 



6. Lesquerella arctica (DC.) S. Wats. Arctic 

 Bladder-pod. Fig. 2018. 



Alyssumf arciicnm DC. Syst. 2: 324. 1821. 

 Vcsicaria arctica Richards. Frank. Journ. 743. 1823. 

 Lesquerella arctica S. Wats. Proc. Am. Acad. 23: 254. 1888. 



Perennial, tufted, densely stellate-pubescent, stem nearly 

 or quite simple, erect, I'-s' tall. Leaves oblanceolate, or 

 spatulate, or the upper oblong, i' long or less, obtuse, 

 entire, the basal ones narrowed into broad petioles, the 

 upper sessile; petals about 2" long; pods oval or subglo- 

 bose, obtuse, 2"-3" high, glabrous or somewhat stellate- 

 pubescent, few-seeded; septum perforated; style i" or 

 less long. 



Greenland and arctic America. Summer. 



The plant described as Lesquerella arctica Purshii S. Watts., 

 is taller, sometimes 6' high ; the septum of the sparsely stellate- 

 pubescent pod unperforated. Anticosti. 



6. PHYSARIA A. Gray, Gen. 111. i : 162. 1848. 



Low perennial stellate-canescent herbs, with erect or ascending usually quite simple 

 stems, spatulate mostly entire leaves, the basal ones tufted, and medium-sized yellow flowers 

 in terminal racemes. Petals longer than the sepals. Style filiform. Silicles membranous, 

 stellate-pubescent, their cells inflated, the septum narrow. Seeds not margined ; cotyledons 

 accumbent. [Greek, bellows, from the resemblance of the inflated fruit.] 



About 6 species, natives of western North America, the following typical. 



I. Physaria didymocarpa (Hook.) A. Gray. 

 Double Bladder-pod. Fig. 2019. 



J'esicaria didymocarpa Hook. Fl. Bor. Am. i : 49. />/. 16. 



1830. 

 Physaria didymocarpa A. Gray. Gen. III. I : 162. 1848. 

 Physaria brassicoides Rydb. Bull. Torr. Club 29 : 237. 



1902. 



Densely stellate-canescent. pale green; root long 

 and deep. Stems decumbent or ascending, slender, 

 simple, 3'-! 2' long; leaves spatulate, the basal ones 

 obtuse, entire, or few-lobed, narrowed into mar- 

 gined petioles, I'-s' long; stem-leaves nearly sessile, 

 acute or subacute, much smaller ; racemes 2'-$' long 

 in fruit ; flowers 5"-6" broad ; pods didymous, vari- 

 able, often 6" thick through the strongly inflated 

 cavities, emarginate at base and summit or narrowed 

 at base, commonly broader than high ; seeds numerous. 



In dry soil, North Dakota to Saskatchewan. British 

 Columbia, Nebraska, Colorado and Nevada. May-Aug. 



