208 ROSACEAE. 



long; sepals and bractlets laciniately 2 or 3-toothed or entire; petals orbicular 

 with a small abruptly acute point at apex, or the margin near the apex slightly 

 crimped, 3 to 4 lines long; fruit globose, about 4 lines in diameter, the achenes 

 I iniiic superficially. 



Openly wooded hills : Napa Valley to Berkeley and Mt. Diablo, and southward 

 to Southern California. 



2. F. chilensis Duch. Sand Strawberry. Eunners slender or rather stout ; 

 upper surface of leaves glabrous, the herbage otherwise densely pubescent with 

 long weak hairs (especially the under surface of the leaves) and often, also, 

 with a fine indument; leaves of firm texture, dark green, the leaflets y 2 to 1 in. 

 long; scapes several-flowered, 1 to 4 in. high; flowers 1 in. in diameter; sepals 

 entire; petals roundish, 4 to 6 lines long; receptacle with the achenes embedded 

 in its surface. 



Sand-dunes and beaches along the sea-coast, San Francisco north to British 

 Columbia. 



8. POTENTILLA L. Five Finger. 



Perennial herbs (or some species of the Sierra Nevada suffrutescent), with 

 compound leaves and serrate or cleft leaflets. Flowers in ours white or yellow, 

 in terminal cymes. Calyx saucer-shaped, campanulate, or cup-shaped, cleft 

 into 5 lobes, with as many alternate bractlets at the sinuses. Petals orbicular 

 to linear. Stamens 10 to many, the filaments filiform or variously dilated. 

 Pistils many or numerous, borne upon an elevated receptacle, becoming in fruit 

 small turgid crustaceous achenes; styles lateral or nearly terminal, deciduous. 

 (Diminutive of the Latin potens, powerful, some species used medicinally.) 



Stamens 10 to many; filaments filiform; petals yellow, obovate, not clawed. 



Stamens 10 (?); leaves palmately 3-foliolate; stems erect or ascending 



1. P. millegrana. 

 Stamens 20 to 25; leaves pinnate, 



Leaves white-silky beneath; creeping herb 2. P. anserine. 



Leaves green on both faces ; stems erect 3. P. glandulosa. 



Stamens 10 in 2 rows, alternately long and short; filaments dilated throughout or at base 

 only; petals white, obovate or linear, often clawed. 

 Cymes disposed to be lax; bractlets mostly as large as the calyx-lobes. 

 Herbage glandular-pubescent and green; bractlets entire or toothed. 



Calyx short-campanulate; leaflets sharply toothed or sparingly incised; stems slender. . 



4. P. multijuga. 

 Calyx cup-shaped. 



Leaflets toothed or incised at apex; stems stout 5. P. calif ornica. 



Leaflets incisely once or twice cleft; stems slender 6. P. data. 



Herbage white-silky, glandless; bractlets entire 7. P. kelloggii. 



Cymes more condensed; bractlets smaller than the calyx-lobes; stems sparingly leafy, 

 the leaves mostly in a radical tuft. 



Lobes of the leaflets obtuse; petals notched at apex S. P. tctmiloba. 



Teeth or short lobes of the leaflets acute; petals entire 9. /'. bolanderi. 



1. P. millegrana Engelm. Stems erect or ascending, leafy up to the In- 

 florescence; leaves ternately 3-foliolate, the lower on long Blender petioles; leaf- 

 lets cuiieate-obovate or roundish, serrate towards the apex, about % in. Long; 

 stipules ovate-lanceolate, entire; flowers very numerous in lax cymes; stamens 

 about 10; achenes white. — (P. rivalis var, millegrana Wats.) 



Lower San Joaquin Eiver. 



2. P. anserina L. Goose-grass. Silver-weed. Eoot bearing a tuft 

 nt leaves, stems and peduncles; stems shinier, prostrate, rooting at each joint; 

 flowers oih' to several, long-peduncled ; leaves white-silky beneath, green above; 

 leaflets 7 to 21, with smaller ones interposed, oblong, sharply serrate; bractlets 

 about equaling the calyx-lobes; petals rounded, much exceeding the calyx; 

 Btamens U < » to 25; receptacle hairy. 



