100 BRASSICACEAE 



9. PHYSARIA A. Gray. Double Bladdeh-pod. 



Cells of the pods much inflated, the upper sinus acute, narrow. 



Pods deeply cordate at the base; lower sinus almost as deep as the upper. 



Pubescence short and close. 1. P. didymocarpa . 



Pubescence long and loose. 2. P. lanata. 



Pods not cordate at the base or slightly so; lower sinus none or very shallow. 

 Cells of the pods 5-10 mm. in diameter, without ridges on the sides. 

 Some of the basal leaves more or less flddle-shaped. 



Leaves of the decumbent flowering stems reduced; terminal lobe of the 

 basal leaves rounded or reniform, very obtuse, entire. 



3. P. vituUfera. 

 Leaves of the ascending flowering stems ample; terminal lobes of the basal 



leaves rhombic or ovate, acute or sometime obtuse, sinuate. 



4. P. floribunda. 

 None of the basal leaves flddle-shaped . 



Basal leaves oblanceolate or spatulate, acute, 2-4 cm. long; pods sUghtly 



cordate at the base. 5. P. acutifoUa. 



Basal leaves rounded-obovate, 4-10 cm. long; pod acutish at the base. 



6. P. brassicoides. 

 Cells of the pods 10-18 mm. in diameter when fully developed, ridged on the sides. 



7. P. Newberryi. 

 Cells of the pods not much inflated, the upper sinus shallow, open. 8. P. Geyeri. 



10. LESQUERELLA S. Wats. Bladder-pod. 



Ovary and pod stellate-pubescent. 

 Pod ovoid or elUpsoid. 



Pod distinctly compressed and acute at the apex. 



Pod 6-8 mm. long ; plant usually more than 1 dm. high. 



Basal leaves broadly oval; septum of the pod eUiptic in outline; style 



equalling the pod, 1. L. Shearis. 



Basal leaves oblanceolate to obovate; septum of the pod ovate in outUne; 

 style much shorter than the pod. 2. L. curvipes. 



Pod 3-5 mm. long; plant usually 1 dm. or less high. 

 Basal leaves linear-oblanceolate or Unear. 

 Pod strongly compressed above. 



Leaves narrowly linear-oblanceolate; plant pulvinate. 



3. L. alpina. 

 Leaves narrowly linear; plant multicipitous, with a subterranean 

 woody caudex. 4. L. parvula. 



Pods shghtly compressed. 5. L, intermedia. 



Basal leaves spatulate; pod not strongly compressed above. 



Plant denselypulvinate, 2-5 cm. high; leaves 2 cm. long or less; pedicels 

 erect or nearly so. 6. L. condensata. 



Plant cespitose, 5-10 cm. high; leaves about 2 cm. long or more; basal 

 leaves oblauceolate-spatulate; pedicels spreading, S-curved. 



7. L. spatulata. 

 Pod not compressed above. 



Basal leaf-blades rounded or broadly spatulate. 



Stem-leaves small, generally less than 1 cm. long, linear-oblanceolate. 

 Basal leaf-blades obovate-spatulate; style shorter than the pod. 



8. L. prostrata. 

 Basal leaf-blades rhombic-ovate; style longer than the very acute pod. 



9. L. Wardii. 

 Stem-leaves oblanceolate or obovate, 1-2 cm. long. 10. L. montana. 



Basal leaf-blades linear-oblanceolate; stem-leaves narrowly so. 



11. L. arenosa. 

 I'od globose. 



Plant perennial. 



Pod 2-3 mm. in diameter. 



Basal leaf-blades spatulate or oblanceolate. 



Stem very slender; stem-leaves oblanceolate, 1-3 cm. long. 



Plant 5 cm. or less high; pod less than 2 mm. broad; petals purple. 



12. L. rosea. 

 Plant usually more than 5 cm. high; pod 2-3 mm. broad; petals 



yellow. 

 Pedicels ascending. 13. L. versicolor. 



Pedicels in fruit recurved. 11. L. arenosa. 



Stemstouter, strict; stem-leaves Unear, 2-6 cm. long. 14. L. ludoviciana. 

 Basal leaf-blades broadly oval, ovate, or elliptic. 



Basal leaves repand-dentate; stems stout; raceme loose; pedicels re- 

 curved. 15. L. Macounii. 

 Ba,sal leaves entire; stem slender; racemes congested; pedicels upcurved. 



16. L. utahensis. 

 Pod 5-6 mm. in diameter; stem-leaves broadly spatulate. 17. L. macrocarpa. 

 Plant annual. 18. L. Gordoni. 



Ovary and pod glabrous, globose. 



Plant annual. 18. L. Gordoni. 



Plant perennial. 



Basal leaf-blades oblanceolate; stem-leaves narrowly so. 



Plants usually more than 3 dm. high; flowers and fruit corymbose. 



19. L. Engelmanni. 



