ROSACES. 115 



1. A, arvensis (L.), Scop. Slender, 1 4 in. high, leafy, floriferous 

 and hirsute-pubescent throughout, the calyx-tube densely hirsute: leaves 

 3-parted, the segments 2 3-cleft: calyx-tube much contracted under the 

 4-parted limb, bractlets minute. Var. glabra, Greene. Glabrous, even 

 to the calyx-tube, which is broader than in the type, less constricted at 

 the orifice, with larger bractlets. Common along borders of thickets, or 

 on open plains; the variety in the valley of the Sacramento. 



8. POTENTILLA, Brunfels (FIVE-FINGER). Herbs with pinnately 

 or palmately compound leaves, the leaflets usually toothed or cleft, and 

 adnate stipules. Flowers axillary and solitary or in terminal cymes. 

 Calyx from flat to campanulate, 5-cleft, valvate, with 5 alternating bract- 

 lets. Petals 5, rounded or elongated, yellow, red or white. Stamens 

 5 oo ; filaments filiform or dilated. Pistils 1 oo ; styles more or less 

 lateral, deciduous. Achenes on a glabrous or hairy dry receptacle. 



* Stamens 10 30, uniform; filaments filiform, or dilated at base only: 



petals rounded. 

 H Perennials; stamens more than 10. 



1. P. Anserina, L. Leaves often 1 ft. long; leaflets 721, with 

 smaller ones interposed, oblong, sharply serrate, white-tomentose 

 beneath, silky or glabrate above: stems prostrate, with long internodes, 

 rooting at each joint and producing at each a tuft of leaves and one or 

 more long peduncled large yellow flowers: petals M~ M in- lo n fif exceeding 

 the calyx: stamens 2025: achenes 2040: receptacle villous. Along 

 stream-banks, margins of ponds, or in springy places both along the 

 seaboard and in the mountains. 



2. P. glandulosa, Lindl. Erect, 12 ft. high, glandular-pubescent 

 and ill-scented: leaves pinnate; leaflets 59, ovate or rhombic-ovate, 

 coarsely and doubly serrate: cyme lax, leaf y-bracted : fl. small; the pale 

 yellow obovoid petals scarcely equalling the calyx: stamens 25, in 1 row, 

 on the margin of the thickened disk : styles attached below the middle 

 of the ovary. Bushy hills. 



*- Annuals or biennials; stamens 10. 



3. P. millegrana, Engelm., Wats. Tall, flaccid, soft-pubescent, leafy 

 up to the inflorescence: leaves ternate, the radical on long slender pet- 

 ioles; leaflets cuneate-obovate, obtusely serrate at apex only; stipules 

 ovate-lanceolate, entire: cymes diffuse', fl. very numerous; petals yellow; 

 stamens about 10: achenes whitish. Muddy banks of the lower San 

 Joaquin. 



4. P. biennis, Greene. Biennial, branched from the base, erect and 

 rather stout, 1 ft. high or more, the stems purple, leafy, the whole 

 herbage pubescent and minutely glandular: stipules oblong-lanceolate, 



