498 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



Leaves linear-laneeolate, denticu- 

 late; sterile filament l>earded. . \l. P. mriabilis. 

 lieaves broad, mostly ovate. 



Herbage pruinose-puborulent through- 

 out 12. P. pruinosus. 



Herbage glabrous or nearly so. 



Calyx lolx>s glandular 13. P. finetorum. 



Calyx loWs not glandular 14. P. ovatus. 



Margins of the leaves entire. 



Herbage pulx'rubnt throughout. 



Loaves oblong to ovate-lanceolate. ... 15. P. collinus. 

 Leaves linear or linear-spatulate. 



Corolla tubular-funnelforni 19. P. gairdneri. 



Corolla gaping 19a. P. gairdneri Mans. 



Herbage glabrous. 



Floweis 2 to 2.5 mm. long. 



Corolla blue 16. P. procerus. 



Corolla pale j'ellow 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 cm. long 21. P. venustur,. 



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. richardsonii. 



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 lcx^ality: " Mountains of Hood River, Oregon, near its confluence with the Colum- 

 bia." Collected by Mrs. Barrett. ^ 

 Range: Ca.scade Mountains of Washington and Oregon near the Columbia River. 

 Specimens examined: Klickitat County, Suiw/or/" 395. 



2. Pentstemon rupicola Howell, FI. N. W. Am. 510. 1901. 

 Pentstemon newherryi rupicola Piper, Bull. Torr. Clul) 27: 397. 1900. 

 Type locality: "Dry rocky clifTs, 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; Svksdorf 458; Klickitat River, Fleit 1164; 

 Nason Creek, Sandberg & Leiherg 667; Lake Chelan, Gorman 587; Cape Horn, Piper 4986. 



Zonal distribution: Hudsonian. 



3. Pentstemon menziesii Hook. FI. Bor. Am. 2: 98. 1838. 

 Type locality: "Nutka." Collected by Menzies. 

 Range: 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 



