154 RANUNCULACEAE. 



Moist woods, in the mountains. Scarcely distinct from the eastern A. 

 guinquefolia L. 



Anemone oregana Gray. Similar to A. piperi but larger; leaflets obovate 

 to oval, obtusish, coarsely serrate or incised with but few teeth; sepals blue, 

 12-20 mm. long. 



In the Cascade Mountains, mostly on the eastern slope. 



192. PULSATILLA. Pasque Flower. 



Perennial herbs with thick rootstocks, long-petioled palmately 

 divided basal leaves and 3 cauline leaves in a whorl forming an 

 involucre remote from the calyx; sepals petal-like; petals none; 

 stamens numerous, the outer often sterile; pistils numerous; 

 akenes with long persistent plumose styles. 



Pulsatilla occidentalis (Wats.) Freyn. Whole plant covered with long 

 hairs; stems stout, 30-60 cm. high; basal leaves long-petioled, divided into 

 numerous narrow segments; cauline leaves similar, sessile; flowers solitary, 

 large; sepals whitish, tinged with purple, 15-20 mm. long; akenes with tails 

 3-4 cm. long. 



Mountain meadows, abundant. 



193. THALICTRTJM. Meadow Rue. 



Erect perennial herbs; leaves 2-3-ternately compound, radical 

 and cauline, the latter alternate; flowers perfect, polygamous or 

 dioecious, generally small, greenish-white, in corymbs, panicles or 

 racemes; sepals 4 or 5, petal-like or greenish, dull-colored; petals 

 none; stamens numerous; pistils 4-15, commonly few, 1-ovuled; 

 akenes capitate, grooved or ribbed, inflated. 



Akenes narrowly fusiform, 3-nerved on each face, in loose 



clusters. T. occidentale. 



Akenes falcate, compressed, obscurely veined, in dense clus- 

 ters. T. papyraceum. 



Thalictrum occidentale Gray. Dioecious; stems 50-100 cm. tall; leaves 

 ternately decompound; leaflets oblong, obovate or orbicular, mostly petioled, 

 incisely dentate at the apex, glabrous, 1—2 cm. long; panicle loose; sepals 

 elliptic-cuneate, greenish; filaments very slender; anthers linear, slender- 

 pointed; akenes 6-12, in loose clusters, stipitate, lanceolate, long-acuminate, 

 3-nerved on each side, the mid-nerve somewhat salient, 6-8 mm. long. 



In moist copses, especially in the mountains. 



Thalictrum papyraceum Greene. Dioecious, glabrous throughout; stems 

 stout, 1-3 m. tall; leaflets 3, incisely 3-lobed, the median lobe mucronate, the 

 others obtuse; panicle loose, narrow; akenes 12-18, in dense globose clusters 

 2 cm. broad, each falcate, strongly compressed, 1 cm. long, the thin pericarp 

 obscurely and irregularly veined. 



Sauvies Island, Oregon, Howell. 



194. TRAUTVETTERIA. 



Tall erect perennial herbs; leaves palmately-lobed, the radical 

 large and long-petioled; the cauline few, short-petioled or sessile; 



