RANUNCULACEJE. (CROWFOOT FAMILY.) 17 



1. A. nemorosa, L. (Wood Anemone.) Smooth or somewhat villous; stems 

 from a slender rootstock, 3 to 12 inches high, without radical leaves, one-flowered; invo- 

 lucre of 3 petioled temate leaves, the divisions cuneate-oblong to ovate, incisely toothed 

 or lobed, or the lateral ones 2-parted, about an inch long; the 4 to 7 sepals pinkish or 

 ^iv•hite; akenes 12 to 20, oblong, with a hooked beak. 



Here belongs Thalictrum Fendleri, Englm. A smooth apetalous dioecious herb; also, 

 Myosurus minimus, L. A very small herb, with a tuft of linear or spatulate entire 

 radical leaves, and solitary flowers on simple scapes; called Mouse-tail, from its long, 

 narrow receptacle, densely covered with small akenes. 



3. RANUNCULUS, L. Buttercup. 



Sepals usually 5. Petals 3 to IS. Pistils numerous. Akenes in a head, usually flat- 

 tened, beaked with the persistent style. 



§ 1. Aquatic herbs; petals wJdte, with a pit at the base, the claw yellow; akenes trans- 

 versely wrinkled. 



1. R. hederaceus, L., var. Glabrous; stems 6 to 12 inches long, floating; leaves 

 com.monly all floating, 3 to 8 lines wide, deeply 3-lobed, truncate or cordate at the base; 

 the lobes equal, oval or oblong, the lateral ones usually with a broad notch in the apex; 

 submersed leaves none or rudimentary and resembling adventitious roots; peduncles 

 opposite the upper leaves, thicker than the petiole, 6 to 8 lines long; sepals a line long; 

 petals 2 lines long, obovate oblong; stamens 5 to 9; akenes 4 to 6. 



2. R. aquatilis, L., var. tricopliylius, Chaix. Stems long, filiforni; leaves all 

 submersed and cut into numerous capillary segments, which are 4 to 10 lines long; flowers 

 3 to 5 lines in diameter; akenes numerous in a globular head. 



§ 2. Terrestrial herbs, but often grovnng in ivet places; sepals green; petals ydlow, icith 

 a scale at the base; akenes neither wrinkled nor hispid. 



* All the leaves undivided, the margins entire. 



3. R. riammula, L., var. reptans, Gr. Glabrous throughout; stems fiHform, creep- 

 ing and rooting at the joints, 4 to 10 inches long; leaves mostly lanceolate and acute at 

 each end, entire; flowers 2 to 5 lines in diameter; ]jetals broadly obovate, one half longer 

 than the sepals; akenes few, in a small globular head, plump, smooth; beak very short 

 and curved. 



4. R. alismeefolius, Geyer. Similar to the last species, but with stoutish, erect 

 Btenis, longer flowers and obtuse leaves; akenes straight-beaked. 



* * Some or all the leaves ternately compound. 



5. R. Califoinicus, Benth. More or less hairy; stems erect, or nearly so, 12 to 18 

 inches high; radical leaves, commonly pinnately temate, the leaves laciniately cut into 

 3 to 7 parts, which are usually linear; flowers bright yellow, 5 to 10 lines in diameter- 



