208 ROSACEAE. 



Sieversia ciliata (Pursh) G. Don. Erect, from stout rootstocks, 30-50 

 cm. high, soft hairy throughout; radical leaves tufted, oblanceolate in outline, 

 10-15 cm. long, pinnate with numerous leaflets, these cuneate, obovate, in- 

 cisely cleft into acute narrow lobes; caulinc leaves 1 or 2, much reduced; 

 flowers long-peduncled, 3-5 in a cyme; calyx purplish, the linear bractlets 

 scarcely exceeding the triangular acute calyx-lobes; petals oblong, erect, 

 yellowish with purple veins, shorter than the calyx; akenes with straight 

 plumose tails, 2-3 cm. long. 



In open prairies, rare west of the Cascade Mountains. 



Sieversia campanulata (Greene) Rydb. Very similar to 5. ciliata; stems 

 not so tall, 15-25 cm. high, mostly 2-flowered; calyx-tube hemispheric, the 

 lobes obtusish; petals broadly obovate, reddish-purple, much exceeding the 

 calyx. 



Olympic Mountains, Clallam County, Washington, Elmer, Grant; Saddle 

 Mountain, Oregon, Gorman. 



280. POTENTILLA. 



Annual or perennial herbs; leaves alternate, pinnate or pal- 

 mate, with stipules; flowers perfect, solitary or in cymes; sepals 

 5, rarely 4, with 5, rarely 4, alternate bractlets; petals 5, seldom 

 4, rounded, mostly yellow; stamens usually 20, in two or three 

 rows on the calyx-tube; style small, terminal or nearly so, not 

 elongating in fruit, neither jointed nor plumose; carpels usually 

 numerous; ovules pendulous, anatropous; receptacles and akenes 

 dry in fruit. 



Flowers solitary, long peduncled. P. longipedunculata. 



Flowers cymose. 



Cymes leafy; annuals or biennials with small flowers 

 and ternate leaves. 

 Petals as long as the sepals. P. monspeliensis. 



Petals much shorter than the sepals. 



Cymes loose, rather broad; leaflets oblanceo- 

 late. P. millegrana. 

 Cymes narrow, elongated; leaflets obovate. P. biennis. 

 Cymes not leafy; perennials, with digitate leaves. 

 Leaflets 3. 



Plant densely silky-villous. P. villosa. 



Plant glabrous or nearly so. P. flabellifolia. 



Leaflets 5-9. 



Low alpine plants, 20-30 cm. high; cymes few- 

 flowered. 

 Leaves green, pubescent. P. diver sifolia. 



Leaves glaucous, nearly glabrous. P. glaucophylla. 



Taller lowland plants, 40-80 cm. high; cymes 

 many-flowered. 

 Leaflets white-tomentose beneath. P. gracilis. 



Leaflets green on both sides. P. macropetala. 



Potentilla longipedunculata Rydb. Perennial with creeping rootstocks, 

 villous; stems ascending, 40-50 cm. long, dichotomously branched; leaves 

 digitately 3-5-foliolate; leaflets oblanceolate, 3-5 cm. long, deeply incised- 

 serrate, green above, white tomentose beneath; peduncles villous, 1-flowered, 

 about 10 cm. long; flowers 2 cm. broad; petals broadly cuneate, retuse, yellow; 

 stamens about 20. 



Known by a single specimen from Monmouth, Oregon; possibly abnormal. 



