580 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Anthers variously shaped, dehiscent for nearly their whole 

 length. 

 Flowers scarlet or cardinal red. 



Plants strongly glaucous 3. P. superhis. 



Plants green, seldom or never glaucescent. 



Corolla contracted at the mouth, the lobes 3 mm. 

 long or less. 

 Sepals broadly ovate, obtuse; cauline leaves 



triangular-lanceolate, thick 4. P. crassulus. 



Sepals lance-ovate or narrower, acute; cauline 



leaves triangular-ovate, thin 5. P. cardinalis. 



Corolla not contracted at the mouth, the lobes 

 much more than 3 mm. long. 

 Corolla inflated in the throat; leaves elongated- 

 linear 6. P. lanceolatus. 



Corolla nearly tubular; leaves not elongated- 

 linear. 



Leaves filiform, crowded 7. P. pinifolius. 



Leaves broad, lanceolate or wider, not 

 crowded. 

 Corolla obscurely bilabiate, the lobes 

 scarcely spreading; pedicels short, 



stout 12. P. eatoni. 



Corolla strongly oilabiate, the lobes 

 spreading; pedicels long, slender. 

 Lower lip of corolla bearded within. 8. P.barbatus. 

 Lower lip not bearded. 



Anthers glabrous 9. P. torreyi. 



Anthers long-bearded 10. P. trichander. 



Flowers never scarlet nor cardinal red, crimson to blue or 

 white. 



Upper leaves perfoliate 11. P. spectabilis. 



None of the leaves perfoliate. 



Anthers bearded with long villous hairs. 



Stems and leaves pubeiiilent 15. P. comarrhenns. 



Stems and leaves glabrous. 



CaljTC lobes acute or obtuse 13. P. strictus. 



CaljTC lobes long-acuminate 14. P. strictiformis. 



Anthers not bearded, sometimes short-hirsute. 



Plants siiffruticose at the base ; leaves linear or 

 nearly so. 

 Calyx lobes scarious-margined , dentate or 



erose; floral leaves reduced 16. P. linarioides. 



Calyx lobes scarcely scarious-margined, 

 entire; floral leaves not reduced. 



Leaves green, glabrate 17. P. crandalhi. 



Leaves grayish, canescent-puberulent. 18. P. teucrioides. 

 Plants not suffruticose at the base; leaves va- 

 rious. 

 Corolla tube almost cylindric or very slightly 

 widened upward. 



Leaves more or less dentate 19. P. humilis. 



Leaves entire. 

 Calyx lobes merely acute; inflorescence 



glandular, loose lil. P. oliganthus. 



