703 HYDROPHYLLACEAE 



22. P. Rattani A. Gray. Stem 1-4 dm. high; leaves oval or ovate in out- 

 line, thin, hirsute; inflorescence lax and few-flowered; sepals spatulate, long-his- 

 pid, twice as long as the fruit; corolla sky-blue or white, campanulate; lobes 

 short. Shady places: Ore. Ida. n Calif. Je-Jl. 



23. P. Franklinii R. Br. Stem 2-4 dm. high, softly hirsute, erect, rather 

 simple; leaves pinnatifid, densely pilose or hirsute; divisions many, oblanceolate 

 or oblong, deeply cleft or pinnatifid into lanceolate divisions ; inflorescence dense ; 

 calyx-lobes linear, about 5 mm. long; corolla pale blue or almost white, about 8 

 mm. long; stamens slightly exserted. Hillsides and banks: Hudson Bay Mich. 

 Wyo. Ida. Mack. Submont. Boreal. My-Jl. 



24. P. linearis (Pursh) Holz. Stem 1-4 dm. high, at last branched, grayish 

 puberulent; leaves 2-5 cm. long, simple, linear, or cleft into 3-7 linear divisions; 

 inflorescence thyrsoid-paniculate; sepals narrowly linear, hispid-ciliate; corolla 

 bright blue, rarely white, about 1 cm. long; filaments glabrous, scarcely exserted. 

 P. Menziesii (R. Br.) S. Wats. Valleys and hillsides, especially in sandy soil: 

 Alta. Wyo. Utah Calif. B.C. Plain Submont. Ap-Jl. 



25. P. idahoensis Henders. Stem simple, 3-6 dm. high, glabrous below, 

 somewhat hirsute above; leaves pinnatifid, the lower petioled, 1-2 dm. long, 

 sparingly pilose; divisions oblong or lanceolate, entire or cleft, pale beneath; 

 inflorescence an elongate spike-like thyrsus; calyx-lobes narrowly linear, ciliate; 

 corolla light blue, puberulent, 5 mm. long. Moist meadows: Ida. Submont. Je. 



26. P. Lyallii (A. Gray) Rydb. Stem 1-2 dm. high, sparingly hirsute; 

 leaves oblanceolate in outline, -10 cm. long, green, sparingly strigose; lobes 

 broadly oblong; inflorescence short and dense; calyx-lobes linear, hirsute, 5 mm. 

 long; corolla dark blue, 8 mm. long. High mountains: Mont. Ida. B.C. 

 Subalp. Alp. 



27. P. sericea (Graham) A. Gray. Stem 1-3 dm. high, strigose-canescent; 

 leaves 3-10 cm. long, silvery-silky; divisions cleft into linear or linear-oblong 

 divisions; inflorescence spike-like; calyx-lobes linear, silky-villous; corolla violet- 

 blue, open-campanulate, 5-6 mm. long. High mountains: Alta. Colo. Nev. 

 Wash. B.C. Mont. Alp. Je-Au. 



28. P. ciliosa Rydb. Stem 2-5 dm. high, more or less strigose; leaves 5-15 

 cm. long; segments entire or 2- or 3-cleft, with oblong divisions, green, but more 

 or less strigose; petioles and rachis often hispid-ciliate; inflorescence spike-like, 

 1-2 dm. long; sepals linear, hirsute; corolla violet-blue, 5-6 mm. long; filaments 

 glabrous. Mountains: Alta. Colo. Nev. B.C. Submont. Subalp. Je-Au. 



29. P. firmomarginata A. Nels. Stem branched from the base, 1-2 dm. 

 high, puberulent and slightly glandular and hispid; leaves alternate, 1-4 cm. 

 long, pinnatifid, with oblong or obovate crenulate divisions, puberulent and 

 hispidulous; inflorescence spike-like, in fruit 3-6 cm. long; corolla pale or white, 

 shorter than the calyx; folds obsolete. Desert regions: Ida. Son. Je. 



30. P. cephalotes A. Gray. Stem divaricately branched, nearly prostrate, 

 less than 1 dm. long, glandular-hirsute; leaves petioled; blades somewhat fleshy, 

 oblong or spatulate, 1-2 cm. long; calyx-lobes linear-spatulate or linear, hispid; 

 corolla white or yellowish, with blue or purplish limb, 4 mm. long, almost cylin- 

 dric. River banks and canons: s Utah. L. Son. Ap-Je. 



31. P. minutissima Henders. Stem branched at the base, 2.5-6.5 cm. 

 high; leaves lanceolate or linear, 7-9 mm. long; inflorescence few-flowered; flow- 

 ers subsessile; sepals oblong-spatulate, 2-4 mm. long; corolla subcylindric, 2 mm. 

 long. P. foliosepala A. Nels. Rocky places: Ida. Mont. 



32. P. Knightii A. Nels. Stem 2-5 cm. high, minutely puberulent, simple 

 or branched; leaves few, petioled; blades somewhat fleshy, orbicular to .ovate, 

 entire or nearly so, 5-10 mm. long; calyx-lobes linear-spatulate, shorter than the 

 corolla; corolla narrowly campanulate, about 5 mm. long, with a yellowish tube 

 and purple limb. Barren clayey slopes: Wyo. Submont. Je. 



33. P. demissa A. Gray. Stem diffusely branched, less than 1 dm. high, 

 viscid-puberulent; leaves petioled; blades orbicular or sub-reniform, entire or 



