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. superbus. 
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..........-- wee ee eee ee eee eee eee 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........-00.22202.2222222220- 12. P. eatont, 
Corolla strongly pilabiate, the lobes 
spreading; pedicels long, slender. 
Lower lip of corolla bearded within. 8. P. barbatus. 
Lower lip not bearded, 
Anthers glabrous..........-....- 9. P. torreyt. 
Anthers long-bearded... 2.2.2... 10. P. trichander, 
Flowers never scarlet nor cardinal red, crimson to blue or 
white. 
Upper leaves perfoliate...........2.2.-...2...0.2000- ll. P. spectabilis. 
None of the leaves perfoliate. 
Anthers bearded with long villous hairs, 
Stems and leaves puberulent................-. 15. P. comarrhenus. 
Stems and leaves glabrous. 
Calyx lobes acute or obtuse...........-...- 13. P. strictus. 
Calyx lobes long-acuminate.............. 14. P. strictiformis. 
Anthers not bearded, sometimes short-hirsute. 
Plants suffruticose 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..........2.... 17. 
Leaves grayish, canescent-puberulent.18. 
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.................-.-21. P. oliganthus, 
. crandallai. 
. teucrioides. 
Shy 
