346 Scrophulariaceae 
PENTSTEMON BEARD-TONGUE 
Herbs or shrubs, perennial, ours |—9 dm. high. Leaves opposite, sometimes partly 
alternate or whorled. Flowers various in color, in terminal clusters. Calyx 5-lobed ; 
segments imbricated. Corolla-tube not gibbous; throat ample; limb 2-lipped; upper lip 
2-lobed; lower lip 3-lobed. Stamens 4, included, 2 shorter; 5th stamen a mere filament. 
Seeds many, angled, not winged. (Gk. pente—5, stemon—stamen; because the 5th sta- 
men is conspicuous, altho antherless. ) 
A. Anthers densely woolly with long hairs; shrubs or shrubby at base. 
Group | (p. 346) 
AA. Anthers not densely woolly. 
B. Corolla white or yellowish. Group 2 (p. 346) 
BB. Corolla red or blue or purple or violet. 
C. Leaves all or nearly all entire. Group 3 (p. 347) 
CC. At least most of the leaves not entire. Group 4 (p. 348) 
GROUP 1 
A. Leaves green, not glaucous. 
B. Leaf-blades 7.5—12.5 cm. long, linear to linear-lanceolate, serrulate. E. 
P, lyallii Gray 
BB. Leaf-blades less than 7.5 cm. long, often wider than lanceolate. 
C. Leaves entire. 
D. Leaves 12—38 mm. long; plant not prostrate. (See EE.) 
DD. Leaves 6—12 mm. long; plant prostrate except the short annual branches. 
W.C. (P. davidsonii.) 
P. menziesii davidsonii Pip. 
CC. Leaves not entire. 
E. Plants prostrate; leaves 6—20 mm. long, obovate. W. C. 
P. menziesii Hook. 
EF. - Plants erect to spreading, not prostrate; leaves often longer, often not 
obovate. C.E. (P. lewisii; P. douglasii; P. adamsianus; P. caldwellii; P. 
fruticosus caldwellii; P. scouleri; P. woodsii. ) 
P. fruticosus Gr. 
AA. Leaves glaucous. 
F. Branches prostrate; leaves ovate to orbicular, petioled, puberulent; corolla rose- 
crimson. C. P. rupicola How. 
FF. Branches erect; leaves ovate to lanceolate, sessile, glabrous; corolla lilac-purple. 
Gi P. barrettae Gray 
GROUP 2 
A. Inflorescence viscid-pubescent. 
B. Leaves entire or nearly all so. 
C. Corolla 16—25 mm. long, yellow or or ochroleucous. 
D. Leaves nearly all entire. C. E. 
P. pinetorum Pip. 
DD. Leaves nearly all not entire. C. E. (P. confertus globosus. ) 
P. attenuatus Doug]. 
CC. Corolla 12—16 mm. long, white. E. 
P. humilis Nutt. 
BB. Leaves dentate or nearly all so; corolla 20—-25 mm. long. E. (P. steno- 
sepalus. ) P, glaucus stenopetalus Gray 

