338 CONTKIBUTIONS FROM THE NATIONAL, HERBARIUM. 



2 to 10 cm. high, usually forming dense, hxrge or small mats; petals longer than the 

 sepals; seeds with a thick beak. 



Some of our material may be referable to A. obtusiloba (Rydh.)Ferna\d, but the 

 differences between the two species are not clearly defined. 



30. NYMPHAEACEAE. Waterlily Family. 

 1. NYMPHAEA L. 



1. Nymphaea polysepala (Engelm.) Greene. Yellow pondlily. In small lakes 

 on the west slope. Alaska to Calif., Colo., and S. Dak. — Perennial with very thick 

 rootstocks; leaves long-petioled, floating, oval, 20 to 40 cm long, cordate at base; 

 flowers long-stalked, green and yellow, tinged with red; sepals 6 to 12, the petals 

 very small; fruit a leathery berry, 3 to 8 cm. long, containing numerous brown seeds. 



The plants grow in shallow or deep water, and the petioles and peduncles are often 

 very long. The seeds, under the name of "wokas," are much used for food by some 

 of the Indians of the Pacific coast. 



31. EANUNCUIACEAE. Buttercup Family. 



Hferbs or climbing shrubs; leaves usually alternate, simple or compound; flowers 

 regular or irregular; sepals 3 to 15, usually green but often colored and petal-like; 

 petals as many as the sepals or wanting; stamens usually numerous, rarely 5; fruit 

 dry or fleshy. 



Plants climbing shrubs; leaves opposite 1. CLEMATIS. 



Plants herbs, never climbing; leaves alternate. 

 Flowers in racemes, blue or white. 



Petals white, not spurred; fruit a white or red berry 2. ACTAEA. 



Petals blue, some of them with spurs; fruit of dry pods ... 3. DELPHINIUM. 

 Flowers not in racemes, of various colors. 

 Fruit of several pods, each containing several seeds. 

 Flowers with spurs, yellow or blue; leaves with numerous leaflets. 



4. AQTJILEGIA. 



Flowers not spurred, white; leaves with few divisions 5. TROLLIXJS. 



Fruit a head of few or many (1-seeded) achenes. 

 Plants submerged in water; leaves all divided into threadlike lobes. 



7. BATRACHIUM. 

 Plants not growing in water or, if so, the leaves not divided into narrow lobes. 



Leaves narrowly linear; stems naked 6. MYOSURTIS. 



Leaves not linear; stems usually leafy or with bracts. 

 Petals and sepals present; petals yellow. 

 Achenes with longitudinal ribs; stems creeping, rooting at the joints; 



leaves with small rounded teeth 8. HALERPESTES. 



Achenes not ribbed; stems neither creeping nor rooting or, if so, either 



entire or sharply toothed 9. RANUNCULTJS. 



Petals none, but the sepals often resembling petals; sepals never yellow. 



Achenes few, not hairy; flower stems not bearing a pair or whorl of 



leaves below the flowers; sepals greenish ... 10. THALICTRTIM. 



Achenes many, hairy; flower stems with a pair or whorl of leaves below 



the flowers; sepals white to blue or purple. 



Achenes with long hairy tails in fruit; sepals 2 to 3.5 cm. long. 



11. PULSATILLA. 

 Achenes not tailed ; sepals less than 2 cm. long ... 12. ANEMONE. 



