332 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Thyrsus not secund, composed of close fascicles; flowers bluish; leaves 
eomewhat fleshy, slightly glaucous, evidently reticulate-veined. 
44. P. osterhoutii. 
Sepals broadly ovate, mostly acute; sterile filament more shortly bearded, 
much of the expanded white apex frequently glabrous; basal and 
stem leaves broadly obovate to elliptic-ovate....... 45. P. versicolor. 
Corolla 15 to 20 mm. long; sterile filament slightly enlarged distally, densely 
bearded with yellowish hairs; stem leaves ovate, the upper ones acumi- 
nate to rounded-mucronate, thickened-fleshy. 
Corolla 18 to 20 mm. long; sterile filament relatively short-bearded. 
46. P. lentus. 
Corolla 15 to 18 mm. long; sterile filament relatively long-bearded. 
47, P. pachyphyllus. 
Corolla 10 to 25 mm. long, glabrous within (sometimes somewhat lanate-pubescent 
in P. arenicola), changing from pink to coerulean blue; sterile filament less 
densely bearded. 
Corolla 25 mm. long; sterile filament slightly enlarged distally, slightly bearded 
near the apex; sepals lance-attenuate, 8 mm. long; stems in large clumps; 
lowest leaves linear, the upper ones lanceolate; bracts large, ovate- 
acuminate, the lower ones elongate................---- 48. P. haydeni. 
Corolla 10 to 20 mm. long; sterile filament obviously enlarged distally, more 
strongly bearded, especially toward the apex; sepals acute to acuminate, 
4to 8 mm. long; stems in small clumps; lowest leaves not conspicuously 
narrower than the upper ones; bracts not so conspicuously enlarged. 
Sterile filament moderately enlarged distally, but not terminating in a 
broad white apex; seeds more than one-half as wide as long, dark 
brown; lower bracts more or less elongate, linear-lanceolate to lanceolate. 
Leaves linear to lanceolate, acuminate; corolla 15 to 20 mm. long. 
Bracts elongate, mostly gradually tapering from the base; corolla 15 to 
18 mm. long, the lobes spreading less than 12 mm. wide; capsule 
narrowly ovate to ovate, mostly 7 to 8 mm. wide. 
49. P. angustifolius. 
Bracts less elongate, mostly abruptly contracted from the widened 
base; corolla usually nearly 20 mm. long, the lobes spreading 15 
mm. wide; capsule more broadly ovate, about 10 mm. wide. 
49a. P. angustifolius caudatus. 
Leaves mostly oblanceolate, obtusely mucronate to short-acuminate; 
corolla 10 to 15 mm. long..........-...---------- 50. P. arenicola. 
Sterile filament expanded distally into a broad white apex; seeds less than 
or about one-half as wide as long, reddish brown; lower bracts not 
elongate, ovate. 
Sepals lance-acuminate; capsule pale brown; seeds about 3 mm. long. 
51. P. nitidus. 
Sepals ovate, acutish to acute; capsule dark brown; seeds about 4 to 5 
mm. long ....... 2 eee eee eee eee eee 45. P. versicolor 
Stamens and style conspicuously exserted; anther sacs approximate. 
52. P. cyathophorus. 
XI. LARICIFOULII. 
Plants grayish-puberulent; leaves narrowly linear, more crowded on the lower part 
of the stem and on the basal branches arising from the elongate caudex; corolla 
throat strongly inflated. 
Plants closely puberulent.......................-----2-- 53. P. coloradoensis. 
Plants more loosely and strongly puberulent...... 53a. P. coloradoensis sileri. 
