CRUCIFERAE. 



VOL. II. 1 



5. Lesquerella ovalifolia Rydb. Oval- 

 leaved Bladder-pod. Fig. 2017. 



Lesquerella ovalifolia Rydb. ; Britt. & Brown, 111. I !. 

 2: 137. 1897. 



Perennial from a tufted caudex, pale, 

 stellate-canescent. Basal leaves tufted, broadly 

 oval to obovate, sometimes nearly orbicular, 

 entire, obtuse or subacute, i'-2' long, narrowed j 

 into rather long petioles; stem-leaves distant, 

 sessile, or the lowest short-petioled, line- 

 lanceolate or narrowly spatulate; fruiting pedi- 

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

 pods very short-stipitate, subglobose, obtusi 

 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. 



Alyssum? arcticum DC. Syst. 2: 324. 1821. 

 Vesicaria 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'-5' 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 sir 

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

 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. 



Vesicaria didymocarpa Hook. Fl. Bor. Am. i : 49- P^ l(> - 



1830. 



Physaria didymocarpa A. Gray, Gen. 111. i : 162. 1848. 

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



1902. 



Densely stellate-canescent, pale green ; root I 

 and deep. Stems decumbent or ascending, s: 

 simple, 3'-i2' long; leaves spatulate, the basal ( 

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

 gined petioles, i'-s' long; stem-leaves nearly 

 acute or subacute, much smaller; racemes 2'-5 

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

 able, often 6" thick through the strojigly inflatec 

 cavities, emarginate at base and summit or narrowe 

 at base, commonly broader than high ; seeds numerous 



In dry soil, North Dakota to Saskatchewan. British 

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



