FLOWERING PLANTS AXD FERXS OF ARIZONA 731 



6. Leaf blades thickish; filaments sparsely pilose 5. P. pulchella. 



5. Corolla not or but slightly longer than the calyx (7). 



7. Leaf blades as wide as long or wider, orbicular-cordate or reniform; 



petiole usually much longer than the blade (8). 

 8. Plant hirsute or hispid, also glandular-puberulent : leaf blades thin, 

 coarsely crenate; racemes becoming loose, several-flowered, at 

 length surpassing the leafy portion of the stem: capsule ab- 

 ruptly pointed 6. P. ROTUXDIFOLIA. 



8. Plant merely glandular-puberulent; leaf blades thickish, entire: 



racemes rather dense, few-flowered, not surpassing the leafy 



portion of the stem; capsule very obtuse 7. P. demissa. 



7. Leaf blades about one-half as wide as long or narrower, narrowly 

 lanceolate or oblanceolate to ovate-oblong, entire or nearly so, 

 thickish: petiole usually about as long as the blade: plant hispid 

 (9). 



9. Corolla less than 5 mm. long; glandular pubescence present; 



filaments glabrous 8. P. saxicola. 



9. Corolla 5 to 10 mm. long; glandular pubescence none; filaments 



sparsely pilose 9. P. curvipe.-. 



Leaves one or more times pinnate or pinnatifid, or pinnately toothed or, if 



entire, then the veins very prominent beneath and the stems hispid (10). 

 10. Seeds transversely corrugate all around; flowers in simple, terminal and 

 axillary, more or less scorpioid racemes, these at length rather loose; 

 plants annual, glandular-puberulent and pilose: stems usually less than 

 30 cm. long; corolla funnelform : stamens and style not exserted (11). 

 11. Corolla little, if at all, longer than the calyx, not more than 5 mm. long, 

 white or purplish (12). 

 12. Plant few-branched from the base: stems erect or ascending; leaves 

 pinnatifid, the lobes entire or incised: racemes much surpassing the 

 leafy portion of the stem; calyx lobes broadly spatulate. 



10. P. AFFIXES. 



12. Plant many-branched from the base: stems decumbent or spreading; 



leaves pinnatifid, pinnatisect, or bipinnatifid; racemes not sur- 

 passing the leafy portion of the stem; calyx lobes narrowly spatulate. 



11. P. IVESIANA. 

 11. Corolla 2 to 3 times as long as the calyx, 10 to 15 mm. long, deep blue or 

 violet with a yellow throat: leaves pinnatifid or pinnatisect with 

 numerous lobes or divisions, these entire or incised (13). 



13. Primary leaf lobes or divisions usually less than twice as long as wide; 



fruiting calyx slightly to one-third longer than the capsule; corolla 



funnelform-campanulate 12. P. fremoxtii. 



13. Primary leaf lobes or divisions usually at least twice as long as wide; 

 fruiting calyx l 1 * to 2 times as long as the capsule; corofla funnel- 

 form 13. P. BICOLOR. 



10. Seeds corrugate (if at ail) only on the margins and keel of the excavated 

 side; stamens and style mostly exserted (14). 

 14. Racemes not circinate or scorpioid, dense, composing a narrow, elongate, 

 spikelike panicle: plant perennial (sometimes biennial?), not glandular, 

 silvery-sericeous or glabrate; leaves pinnately parted, with numerous 

 linear or narrowly oblong divisions, these often incised or pinnatifid ; 

 corolla campanulate, usually violet; seeds not cymbiform. 



14. P. sericea. 

 14. Racemes circinate or scorpioid, at least until anthesis (15). 



15. Stems hispid: leaves simple or pinnate with not more than 5 entire- 

 margined leaflets, the veins very prominent beneath; plant peren- 

 nial; corolla whitish or bluish 15. P. HETEROPHYLLA. 



15. Stems not hispid or, if so, then the leaves pinnate, pinnatifid, or toothed, 



with more than 5 leaflets, lobes, or teeth, or the veins not prominent 



beneath, or the plant not perennial (16 . 



16. Seeds not excavated or corrugate on one side, deeply pitted: stems 



weak, usually supported by other vegetation, hirsute or hispid; 



leaves once or twice pinnately parted or divided, the divisions 



variously incised: calyx densely hirsute or hispid, 2 to 4 times as 



long as the capsule (17). 



