498 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
Leaves linear-lanceolate, denticu- 
late: sterile filament bearded. . 11. P. variabilis. 
Leaves broad, mostly ovate. 
Herbage pruinose-puberulent through- 
out .....-2-2---2.-2-----2-------- 12. P. pruinosus. 
Herbage glabrous or nearly so. 
Calyx lobes glandular. ......--.- - 13. P. pinetorum. 
Calyx lobes not glandular ....--- 14. P. ovatus. 
Margins of the leaves entire. 
Herbage puberulent throughout. 
Leaves oblong to ovate-lanceolate.... 15. P. collinus. 
Leaves linear or linear-spatulate. 
Corolla taubular-funnelform. -. -. . 19. P. gairdnert. 
Corolla gaping Lee ee eee ee eee 19a. P. gairdnert hians. 
Herbage glabrous. 
Flowers 2 to 2.5 mm. long. 
Corolla blue........---.------- 16. P. procerus. 
Corolla pale yellow. .......-.--- 17. P. confertus. 
Flowers 3 to 3.5 mm. long ......-.-- 18. P. attenuatus. 
Cells of the anthers splitting only at apex, the bases 
sac-like. 
Leaves glandular-pubescent.......-.-.-.--------- 20. P. glandulosus. 
Leaves glabrous or nearly so. 
Inflorescence glandular; corolla 3 em. long. .-. - 21. P. venustus. 
Inflorescence not glandular; corolla smaller. 
Leaves linear or lanceolate, often in whorls 
of 3; corolla purple, 10 to 13 mm. long.. 24. P. triphyllus. 
Leaves broader, oblong or ovate; corolla 
larger. 
Corolla red, 20 to 25 mm. long; leaves 
coarsely dentate or lobed... .....-- 22. P. richardson. 
Corolla blue, 15 to 20 mm. long; leaves 
finely serrate or dentate.........-- 23. P. diffusus. 
1. Pentstemon barrettae A. Gray, Syn. FI. ed. 2. 2!': 440. 1886. 
Type Loca.ity: “ Mountains of Hood River, Oregon, near its confluence with the Colum- 
bia.’”’ Collected by Mrs. Barrett. 
RanGeE: Cascade Mountains of Washington and Oregon near the Columbia River. 
SPECIMENS EXAMINED: Klickitat County, Suksdorf 395. 
2. Pentstemon rupicola Howell, Fl. N. W. Am. 510. 1901. 
Pentstemon newberryi rupicola Piper, Bull. Torr. Club 27: 397. 1900. 
Type Locauity: “Dry rocky cliffs, Mt. Rainier,’ Washington. 
RanGE: Cascade Mountains of Washington. 
SPECIMENS EXAMINED: Mount Rainier, Piper 2086; Allen 130; without locality, Vasey; 
Mount Adams, Henderson, August 9, 1892; Suksdorf 458; Klickitat River, Miett 1164; 
Nason Creek, Sandberg & Leiberg 667; Lake Chelan, Gorman 587; Cape Horn, Piper 4986. 
ZONAL DISTRIBUTION: Hudsonian. 
3. Pentstemon menziesii Hook. Fl. Bor. Am. 2: 98. 1838. 
Type Locauity: “ Nutka.”’ Collected by Menzies. 
Rance: British Columbia and Washington. 
SPECIMENS EXAMINED: Olympic Mountains, Piper 2176; Henderson; Mount Rainier, 
Piper in 1888; Cascade Mountains, latitude 49°, Lyall in 1859; Mount Benson, Macoun 
