176 ROSACEAE 



b. Styles slender, much exceeding mature achene. 



Leaves pinnate. 



Leaflets 11 to 27, deeply incised above the middle; stems leafy; Los Angeles coast 



^ - , „ , , i. :. J 13. P. multijuga. 



Leaflets 7 to 13 ; stem leaves few, reduced. 



Leaflets pinnately toothed or incised; herbage not tomentose; Sierra Nevada and North 



Coast Ranges 14. P. drummondii. 



Leaflets palmatcly toothed or incised. 



Herbage greenish, not tomentose. 



Petioles as long as the blades to % as long ; leaflets incised Va to % of the way 



to the midrib ; coast line 15. P. hickmanii. 



Petioles very short, i/jo to % as long as the blades; leaflets incised nearly to the 



midrib into linear segments; Sierra Nevada 16. P. millefolia. 



Herbage more or less tomentose, often silvery ; Sierra Nevada and Siskiyou Co 



, , ^ , , , 17. P. breweri. 



Leaves palmate or subpalmate. 



Herbage greenish, silky-villous to glabrate, not tomentose. 



Leaflets 3, flabellif orm, incisely many-toothed ; cymes few-flowered ; Sierra Nevada and 



Siskiyou Co 18. P. flabellifoUa. 



Leaflets 3 to 7 (or 9), cuneate or cuneate-obovate ; cymes many-flowered. 



Leaves usually strictly palmate, the leaflets 3 to 5, crenately 3 to 5-toothed at the 



summit only; ranges bordering the southern deserts 19. P. wheeleri. 



Leaves usually subpalmate, the leaflets 5 to 7 (or 9), toothed at the apex or above 



the base, the teeth lanceolate or triangular; Sierra Nevada 



20. P. diversifolia. 



Herbage often tomentose ; leaves strictly palmate ; leaflets oblanceolate to obovate, pinnately 



toothed or incised. 



Leaflets tomentose, silky, villous or glabrate beneath, toothed to deeply incised, the 



margins not revolute; montane, widely spread 21. P. gracilis. 



Leaflets more or less tomentose beneath, divided almost to the midrib into spreading 



linear segments with revolute margins (except in var. inyoeusis) ; Modoc Co 



22. P. flabellif or mis. 



II. Stamens 5 to 20, inserted on the margins op or well, up on the calyx-tube ; no annular 



DISK ; leaves always PINNATE ; PERENNIAL HERBS. 



1. Filaments filiform (except P. purpurascens and P. argyrocoma) ; stamens 5 to SO; calyx-tube 



mostly campanulate or bowl-shaped ; petals white or yellow; pistils 1 to 15 (or 20 



to 25) ; leaflets many to numerous, usually crowded or imbricated, 1 to 3 



(or 4) lines long, commonly palmately cleft or divided into 



2 to 4 (or 5) segments. — Subgenus Ivesia. 



Stamens 15 to 20. 



Leaves not terete but with more or less imbricated leaflets ; Sierra Nevada. 

 Petals not long-clawed. 



Filaments dilated; pistils 20 to 25; herbage pubescent to glabrous, somewhat 



glandular 23. P. purpurascens. 



Filaments filiform; pistils 2 to 8; herbage glabrous or nearly so, glaucous, not 



glandular 24. P, Tcingii. 



Petals long-clawed. 



Pistils 9 to 12; herbage villous but greenish; petals yellow; stem leaves few, re 



duced 25. P. campestris. 



Pistils 2 to 5 ; stems leafy. 



Herbage greenish, silky-villous; petals white 26. P. unguiculata, 



Herbage densely white-silky; petals yellow or white 27. P. picTceringii. 



Leaves terete, the leaflets closely imbricated ; herbage silvery-sUky. 



Filaments dilated ; pistils 4 to 7 ; cymes more or less corymbosely clustered ; San Bernar 



dino Mts 28. P. argyrocoma. 



Filaments filiform; pistil 1; cymes open-paniculate, much branched; Sierra Nevada, 



Southern California 29 P. santolinoides. 



Stamens 5 or 10 (20 in P. callida). 



Herbage silvery-sUky ; leaves terete ; stamens 5 ; cymes capitate ; Sierra Nevada..30. P. muirii 

 Herbage villous but greenish, often more or less glandular; leaves not terete (except some 

 times in no. 33). 

 Cymes open, few-flowered. 



Stamens 20; Mt. San Jacinto 31. P. callida. 



Stamens 5 ; Sierra Nevada 32, P. shocMeyi 



Jepson, Flora of California, vol. 2, pt. 2, pp. 17-176, Feb. 15, 1936. 



