ROSACEiB. 51 



12. GEUM. Linnaeus. 



1. O. macrophfyllmn, Wild. Flowers yellow: style jointed: akene- tails hooked. 



2. O. triflorum, Pursh. Flowers purplish: styles plumose: akene-tails feathery. 



13. FRAGARIA, Tournefort. 



' Akenea deeply pitted in the depressed-globose /ruit. 

 Chilensis, Ehrh, Leaves thick, dark greeu, shining: flowera large. Coast. 

 Virg-iniana, Ehrh. Similar: flowers smaller: fruit darker. 



* * Akerus on the surface of the. ovoid fruit. 

 Californlca, C. & S. Light greeu thin leaves: petioles not silky, 

 vesca, L. Similar: larger. Perhaps No. 3 is only a variety of this. 



14. POTENTIL.L.A, Linnaus. 



• 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 3 



Shrubby leaflets entire, silky, margins revolute 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 5 



Silky-villoaa: leaflets closely pinnate or palmate 8, 9 



Glabrous: leaflets 3, broadly cuneiform, 7-9-toothed 11 



In the mountains but mostly lower than 7,000 ft. 



Leaflets 5-15, deeply serrate or pinnatifid 6. 7 



Leaflets 3, toothed above 10, 11 



1. P. glandulosa, Lindley. Petals usually shorter than the calyx. 

 Var. Nevadensis, Watson. More slender: stamens sometimes only 20. 



2. P. Anserina, L. Long runners: leaflets with smaller ones between. Wet places. 



3. P. palusLris, Scop. Many librous roots: leaves palmate: leaflets serrate. Swampa- 

 P. fruticosa, L. Much branched: stamens 30: carpels very villous. 



5. P. Breweri, Watson. Leaflets nearly equal, 3-6 lines long: petals large. 



6. P. Plattensis, Nutt. Slender stems 3-12 inches long: leaflets pmnatitid. 



7. P. 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, 3-5toothed, 6 lines long or lesa. 



10. P. Grayi, Watson. Low stems 3-6-flowered: leaflets 5-7- toothed. 



11. P. gelida, C A. Meyer. Leaiieta larger, bio^aer, end one nearly sessile. 



