732 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



17. Plant perennial, glandular-pubescent, at least in the inflorescence, 

 and with scattered glistening granules; leaves not bipinnate 

 (sometimes bipinnatifid) , the divisions rather large; racemes 

 dense and relatively short, even in fruit; calyx lobes lanceolate 

 or elliptic; corolla pale blue or whitish; stamens exserted. 



16. P. RAMOSISSIMA. 



17. Plants annual, with little or no glandular pubescence (18). 



18. Calyx conspicuously hispid, the lobes narrowly spatulate and 

 contracted into long slender claws, after anthesis elongate 

 (8 to 12 mm. long); corolla lavender purple; leaves usually 

 simply pinnate or pinnatifid, with variously toothed or cleft 

 leaflets or divisions; stamens not or only slightly exserted 

 (19). 

 19. Corolla not more than 7 mm. wide and usually much smaller. 



17. P. CRYPTANTHA. 



19. Corolla 8 to 16 mm. wide 18. P. vallis-mortae. 



18. Calyx hirsute or villous (exceptionally somewhat hispid), the 



lobes not contracted into long slender claws; corolla blue; 

 leaves often bipinnate or bipinnatifid (20) . 



20. Scales near the base of the corolla tube with free tips; stamens 



commonly not or but slightly exserted. _ 19. P. distans. 

 20. Scales wholly adnate to the corolla tube; stamens well 



exserted 20. P. tanacetifolia. 



16. Seeds excavated on one side (cymbiform) ; stems relatively stout, 



usually erect or ascending; plants annual or biennial, usually 



glandular-viscid at least in the inflorescence, often ill-scented or, 



if not so, then the herbage silvery-pilose or the corolla lobes 



erose-denticulate (21). 



21. Corolla funnelform, the limb about 3 mm. wide; inflorescence 



usually elongate and narrow; stems stout, erect; leaf blades 



oblong-lanceolate, crenate, dentate, or cleft, usually not more 



than halfway to the midrib (22) . 



22. Seeds not corrugate; leaf blades crenate with broad rounded 



teeth 21. P. integrifolia. 



22. Seeds transversely corrugate or crenate on the excavated side 

 (23). 

 23. Leaf blades shallowly dentate; stems copiously hirsute and 



tomentulose 22. P. palmeri. 



23. Leaf blades deeply serrate-dentate; stems sparingly hirsute 



and canescent-puberulent 23. P. serrata. 



21. Corolla campanulate, the limb usually more than 3 mm. wide; 

 inflorescences more corymbif orm and spreading (24) . 

 24. Seeds not corrugate or crenate (25). 



25. Corolla blue, the lobes entire or nearly so; herbage densely 

 silvery-pilose, soft to the touch, not glandular; leaves 

 coarsely pinnatifid, with broad, few-cleft or few-toothed 



divisions 24. P. congesta. 



25. Corolla white or pale bluish purple, the lobes erose-denticulate ; 

 herbage not silvery-pilose (26). 

 26. Gland-tipped hairs few or none; stems decumbent or pros- 

 trate, not leafy to the inflorescence; leaf blades pinnati- 

 fid, the lobes entire, crenate, or irregularly incised; 

 corolla lobes with obtuse Jor acutish teeth; fruiting ra- 

 cemes rarely more than 4 cm. long; capsule globose. 



25. P. popei. 

 26. Gland-tipped hairs usually numerous o'n the upper part of 

 the plant; stems leafy to the inflorescence; leaf blades 

 pinnatisect, the divisions pinnatifid or pinnately incised; 

 corolla lobes with very acute teeth; fruiting racemes 6 

 to 12 cm. long; capsule short-ovoid. 



26. P. NEOMEXICANA. 



24. Seeds transversely corrugate or crenate on the keel or the 

 margins or both, of the excavated side; corolla normally violet 

 or purple, the lobes entire or nearly so; plants very ill-scented 

 (27). 



