774 SCROPHULARIACEAE 



62 P. pseudohumilis Rydb. Stem glabrous, 2-3 dm. high, simple; basal 

 leaves petioled; blades elliptic or spatulate, thin; calyx 5-6 mm. long; corolla 

 bluish purple, about 15 mm. long, funnelform; sterile stamen with spatulate 

 yellow-bearded end. P. Oweni A. Nels. Wooded mountain sides : Alta. Wyo. 

 Ida. B.C. Submont.Mont. Je-Au. 



63. P. gracilis Nutt. Stem 2-4 dm. high, viscid in the inflorescence; basal 

 leaves short-petioled; blades oblanceolate or elliptic, entire; stem-leaves mostly 

 linear-lanceolate, usually denticulate; corolla almost cylindric, lilac or whitish, 

 18-20 mm. long, slightly bearded within; sterile stamen bearded three-fourths 

 its length Plains and prairies: Man. Tex. Colo. Alta. Plain Submont. 

 Je-Jl. 



64. P. oliganthus Woot. & Standl. Stem slender, 2-3 dm. high, glabrous 

 below, glandular above; basal leaf-blades oblong or oval, 2 cm. long; stern-leaves 

 linear-lanceolate or linear; calyx 4 mm. long, glandular-villous; corolla 20-25 

 mm. long, bearded in the throat; sterile stamen densely yellow-bearded. P. 

 Griffini A. Nels. Mountains: N.M. Colo. Submont. Jl-Au. 



65. P. puberulentus Rydb. Perennial, suffruticose and branched at the 

 base; stems 3-4 dm. high, finely puberulent; leaves narrowly linear-lanceolate 

 or linear-oblanceolate, 2-5 cm. long, entire, acute, with strong midrib and some- 

 what revolute margins, finely puberulent on both sides; inflorescence elongate, 

 racemiform, glandular-puberulent; calyx about 5 mm. long, glandular-puberu- 

 lent; sepals ovate-lanceolate, acute; corolla about 18 mm. long, glandular-puberu- 

 lent without and within; throat funnelform; limb ample, about 1 cm. wide, slightly 

 bilabiate; sterile filament with yellow beard towards the end. Valleys: Ida. 

 Ore. Submont. Son. Jl. 



66. P. oreganus (A. Gray) Howell. Perennial, suffruticose at the base; 

 stems strict, finely puberulent, 2-4 dm. high; basal leaves small, linear-oblance- 

 olate; stem-leaves 2-4 cm. long, 1-3 mm. wide, densely and finely puberulent; 

 calyx-lobes lanceolate; corolla purple, 18-20 mm. long, puberulent without; 

 sterile filament bearded at least two-thirds its length. P. Gairdneri oreganus 

 A. Gray. P. linarioides seorsa A. Nels. Lava fields: Ida. Ore. Submont. Je. 



67. P. radicosus A. Nels. Stems strict, erect, 2-3 dm. high, puberulent; 

 basal leaves small or none; stem-leaves 2-4 cm. long; calyx viscid, 5 mm. long; 

 corolla nearly tubular, dark blue, 14-18 mm. long, sparsely bearded within; 

 sterile stamen bearded half its length. Dry plains: Mont. Colo. Utah Ida. 

 Plain Submont. My-Jl. 



68. P. humilis Nutt. Stems erect, 2-3 dm. high, puberulent throughout 

 and viscid in the inflorescence; basal leaf-blades elliptic, acute, 2-3 cm. long, 

 finely puberulent; stem-leaves sessile, oblong or linear; calyx 4-5 mm. long; 

 corolla deep-blue, tubular-funnelform, sparsely bearded in the throat; sterile 

 stamen bearded at the apex. P. collinus A. Nels. Hills: Wyo. Ore. B.C. 

 Plain Submont. Je-Jl. 



69. P. exilifolius A. Nels. Stems glabrous, 1-2 dm. high; leaves numerous, 

 narrowly linear, channelled or convolute, 1.5-2.5 cm. long; calyx glabrous, 5 mm. 

 long; sepals ovate, acuminate; corolla white, tubular-funnelform, 12-15 mm. 

 long; sterile stamen almost filiform, short-bearded. Dry plains and hilltops: 

 Wyo. Colo. Plain Submont. Je-Jl. 



70. P. laricifolius H. & A. Stems 1-2 dm. long, glabrous; leaves numer- 

 ous, almost filiform, 1-2 cm. long, glabrous; calyx 5 mm. long, glabrous; lobes 

 lance-subulate; corolla 12-15 mm. long, funnelform; sterile stamen club-shaped, 

 bearded half its length. Plains and hills: Ida. Wyo. Submont.Mont. Jl. 



71. P. ambiguus Torr. Stem glabrous, 3-6 dm. high, diffusely branched; 

 bracts subulate; peduncles opposite, 1-3-flowered; calyx glabrous, 3 mm. long; 

 lobes ovate, short-acuminate; corolla 2 cm. long, rose-colored or white; fifth stamen 

 often anther-bearing. Plains: Tex. Okla. Colo. Utah Ariz.; Mex. Son. 

 My-S. 



72. P. Thurberi Torr. Stem 3-4 dm. high, glabrous; leaves 1-3 cm. long; 

 calyx 2-3 mm. long, glabrous; lobes ovate; corolla scarcely 1 cm. long, more 



