ROSACEZ. 51 
12. GEUM, Linnezus. 
1. G macrophyllum, Wild. Flowers yellow: style jointed: akene-tails hooked. 
2 G. triflorum, Pursh. Flowers purplish: styles plumose: akene-tails feathery. 
13. FRAGARIA, Tournefort. 
‘ * Akenes deeply pitted in the depressed-globose fruit. 
1, F. Chilensis, Ehrh, Leaves thick, dark green, shining: flowers large. Coast. 
2. F. Virginiana, Ehrh. Similar: flowers smaller: fruit darker. 
“* Akenes on the surface of the ovoid fruit. 
3. F. Californica, C.&8. Light green thin leaves: petioles not silky. 
4. F. vesca, L. Similar: larger. Perhaps No. 3 is only a variety of this. 
14. POTENTILLA, Linnezus. 
* Style attached at or below the middle of the ovary. 
A foot or two high: leaflets 5-9, coarsely serrate: petals yellow or white............+. 1 
Creeping: leaves and peduncles radical: leaflets 7 to many: petals yellow. ........... 2 
Stems stout, rooting at the joints: flowers dark lurid-purple............+..2e00se00- 3 
Shrubby leaflets entire, silky, margins revolute.............-eccee cece ence reece 4 
** Style attached at or near the top of the ovary: stamens 20. 
Alpine or subalpine (altitude 7,000 ft. or more) leaflets an inch long or less. 
Densely white tomentose: leaflets 7 to 13: carpels stipitate.........-......-- 6 
Silky-villous: leaflets closely pinnate or palmate................20eeeeeee 8, 9 
Glabrous: leaflets 3, broadly cuneiform, 7-9-toothed.............2.-+e2ee-- 11 
In the mountains but mostly lower than 7,000 ft. 
Leaflets 5-15, deeply serrate or pinnatifid...............0+- a fakivoccrapepagseniess 6,7 
Leaflets 3, toothed above.... 2.2... 0.2... cece ee cece c eee n eee neeene 10, 11 
1. P. glandulosa, Lindley. Petals usually shorter than the calyx. 
Var. Nevadensis, Watson. More slender: stamens sometimes only 20. 
2. Anserina, L. Long runners: leaflets with smaller ones between. Wet places. 
3. palustris, Scop. Many fibrous roots: leaves palmate: leaflets serrate. Swamps. 
fruticosa, L. Much branched: stamens 30: carpels very villous. 
5 Breweri, Watson. Leaflets nearly equal, 3-6 lines long: petals large. 
6 Plattensis, Nutt. Slender stems 3-12 inches long: leaflets pinnatifid. 
7. BP. gracilis, Dougl. Taller, more hairy: leaflets and flowers larger. 
Var. rigida, Watson. Tall and stout, not tomentose. The common form. 
8 P. dissecta, Pursh. Leaflets pinnatifid or coarsely serrate: tufted-hairy. 
9. P. Wheeleri, Watson. Leaflets cuneate, 3-5-toothed, 6 lines long or less. 
10. P. Grayi, Watson. Low stems 3-6-flowered: leaflets 5-7-toothed. 
ll. P. gelida, C. A. Meyer. Leariets iaryer, broader, end one nearly sessile. 
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