832 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Thyrsus not secund, composed of close fascicles; flowers bluish; leaves 
somewhat fleshy, slightly glaucous, evidently raticyi ee 
4 osterhoutii. 
Sepals broadly ovate, mostly acute; sterile filament more eae bearded, 
much of the expanded white apex frequently glabrous; basal 
ee 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 shor ae 
P. lentus. 
Corolla 15 to 18 mm. long; sterile filament relatively ong 
47, P. pachyphyllus. 
Corolla 10 to 25 mm. long, glabrous within (sometimes somewhat inate titeeole 
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. haydent. 
Corolla 10 to 20 mm. long; sterile filament obviously gnlarged distally, more 
strongly bearded, especially toward the apex; sepals acute to acuminate, 
4 to 8 mm. long; stems in small clumps; lowest leaves not conspicuously 
narrower than the upper ones; bracts not so conspicuously e 
Sterile filament moderately alee distally, but not terminating in % 
broad white apex; seeds more than one-half as wide as long, dark 
brown; lower bracts more or = 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. SPL 
oy: angustifolius. 
Bracts less elongate, mostly abruptly sete from the wie 
base; corolla usually nearly 20 mm. long, the lobes spreading 
mm. wide; capsule more broadly ovate, about 10 mm. wide. 
. P. angus 
‘ tifolius inc 7 
Leaves mostly qenceniae. obtusely scncropate to short-ac 
corolla 10 to 15 mm. lon ..50. P. arenicol®. 
Sterile filament expanded distally into a broad wile apex; seeds less me 
or about one-half as wide as long, reddish brown; lower bracts P® 
elongate, ovate. lac: ae 
ee mm. 
Sepals lance-acuminate; capsule pale brown; seeds about Bh sig aus 
Rapala o ovate, acutish to acute; capsule dark baw. bike about 4 t 
P.v 
mm. long 
Stamens and styl : 
style conspicuously exserted; anther sacs epproxima eae horus. 
XI. LARICIFOLII. 
Plants grayish-puberulent; leaves narrowly linear, more crowded on the ieee 72 
of the stem and on the basal branches arising from the elongate caudex; : 
throat strongly inflated. ee 
Plants closely puberulent 53. P. coloradoensis- 
Plants more loosely and strongly puberulent..... 69a. P. eoloradoensis sile™ — 
