•4:98 CONTRIBUTIOXS FROM THE NATIONAL HERBARIUM. 



Leaves linear-lanoeolato, dcMiticu- 



late; sterile filament Ijcarded. . 11. P. rnriabilis. 

 lieaves hroad, mostly ovate. 



Herbage pruinose-pul)erul(>nt tlircnigh- 



out 12. P. pntinosus. 



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. colUniis. 

 Leaves linear or linear-spatulate. 



Corolla tubular-fumiclform 19. P. gairdnen. 



- Corolla gaping 19a. P. gairdneri Mans. 



Herbage glabrous. 



Floweis 2 to 2. .5 mm. long. 



J Corolla blue 16. P. procerus. 



Corolla pale yellow 17. P. confertus. 



Flowers 3 to 3.5 mm. long 18. P. aftenuatus. 



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. venusdi.';. 



Inflorescence not glandular; corolla smaller. 

 Leaves linear or lanceolate, often in whorls 



of 3; corolla purple, 10 to 13 nun. long.. 24. P. iriphijllus. 

 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. Fl. ed. 2. 2': 440. 1886. 



Type i.ocwi.rrv: " Moimtains of Hood River, Oregon, near its confluence with theCoJum- 

 Ijia." Collected b}' Mrs. Barrett. 



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

 Specimens examined: Klickitat County, Siik.'<dorf 395. 



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

 Pentstemon neivberryi rupicola Piper, Bull. Torr. Club 27: 397. 1900. 

 Type locality: "Dry rocky cliff's, 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; Suhsdoif 458; Klickitat River, Flett 1164; 

 Nason Creek, Sandherg d; Leiberg 667; Lake Chelan, Gorman 587; Cape Horn, Piper 4986. 



Zonal distribution: Iludsonian. 



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

 Type locality: "Xutka." Collected by Menzies. 

 Range: British Columbia and Washington. 



Specimens examined: Olympic Mountains, Piper 2176; Henderson; Mount Rainier, 

 Piper in 1888; Cascade Mountains, latitude 49°, LgaU in 1859; Mount Benson, Macoun 



