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8. Potentilla L.  Five-rincer. 
Calyx concave or flattened, 5-lobed, aug- 
mented by 5 bractlets. Petals 5. Stamens a 
multiple of 5. Ovaries o, on a slightly coni- 
cal recéptacle. Styles lateral. Fruit co akenes. 
Receptacle not enlarged. 
1. P. @ranpuLosa Lindl. Flowers cymose; 
petals pale yellow, sometimes white.—2f. 
Contra Costa range. Summer. 
2. P. anseRiInA L. Flowers axillary, soli- 
tary, yellow.—2f. Common on moist places. 
Summer. 
4. Horkelia Cham. & Schiecht. 
Calyx campanulate, limb 5-parted, augment- 
ed by 5 bractlets. Petals 5. Stamensa multi- 
of 5. Ovaries inserted on a conical receptacle; 
styles subterminal. Fruit akenes.—2(. 
1. H. Caztrornica Cham. & Schlecht. Glan- 
dular pubescent; calyx-tube deeply campanu- 
late; petals white.—Common. Summer. 
2. H. Kettocem Greene. Silky pubescent; 
calyx-tube spreading; cupuliform; petals white. 
Alameda. Summer. 
Family 4. SANGUISORBACEZ. 
Calyx-tube contracted at its apex, including 
the ovaries. Petals often 0, Stamens and 
ovaries often reduced in number. Ovaries 1- 
ovulate. 
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