74 RANUNCULACEAE. [Vol.. II. 



3. Ranunculus Missouriensis Greene. Missouri Buttercup. (Fig. 1597.) 



Ranunculus Missouriensis Greene, Erythea, 3: 20. 

 1895- 



Perennial (?), similar to the preceding species 

 but larger, sparingly pubescent; stems slender, 

 decumbent, leafy, i long or more, rooting at 

 the lower nodes. Leaves usually wider than 

 long, thin, i'-3' wide, palmately divided nearly 

 to the base into 3 obovate-cuneate incised and 

 lobed segments, the lobes obtuse; petioles slen- 

 der; flowers yellow, long-peduuclcd, 3 // -4 // 

 broad; petals about 5; head of fruit oblong, 

 about 4 // long; achenes conipressed, somewhat 

 wrinkled, rather more than >" long, promi- 

 nently callous-margined on the back, abruptly 

 tipped by a subulate style of rather more than 

 one-half their length. 



In ditches and on borders of lakes, Missouri to 

 New Mexico. July-Aug. 



4. Ranunculus hyperboreus Rottb. Arctic Buttercup. (Fig. 1598.) 



Ranunculus hyperboreus Rottb. Skrift. Kjoeb. Selsk. 10: 458. 1770. 



Stem slender, glabrous, filiform, creeping, 2'-6' long. Leaves 

 petioled, 3-lobcd or cleft, broadly ovate, 2 // -5 // broad, 2"-4" 

 long, obtuse, the base cuneate or rounded, the lobes oblong, ob- 

 tuse, the lateral ones sometimes toothed; petioles sheathing and 

 biauriculate; flowers few, 2"-3" broad, yellow; petals slightly 

 shorter than the reflexed sepals; peduncles 4 // -6 // long; head of 

 fruit globose, 2" broad; achenes slightly compressed, with a 

 minute blunt point. 



Labrador, arctic America, Iceland, northern Europe and Siberia. 

 Summer. 



5. Ranunculus Lappdnicus L. Lapland Buttercup. (Fig. 1599.) 



Ranunculus Lapponicus L. Sp. PI. 553- 

 '75.V 



Anemone nudicaulis A. Gray, Coult. Bot. 

 Gaz. ii : 17. 1886. 



Scaposc from running rootstocks, 3'-6' 

 high. Basal leaves long-petioled, the 

 blade I'-lH' broad, reniform, 3-parted, 

 the divisions broadly obovate, cuneate, 

 obtuse, creuate or lobed; scape i- flow- 

 ered, slender, longer than the leaves, oc- 

 casionally bearing a single deeply lobed 

 leaf; flower 3 // -5 // broad, yellow; petals 

 5-6; sepals generally fewer and reflexed; 

 head of fruit globose, 6" broad; achenes 

 flattened, ovate, gradually narrowed into 

 a slender hooked beak. 



Lake Nipigon and Thunder Bay, Lake 

 Superior, northern Minnesota, western arc- 

 tic America, and in northern Europe and 

 Siberia. Summer. 



