WOOTON AND STANDLEY FLORA OF NEW MEXICO. 251 



1. Batracliium drouetii (F. Schultz) Nyman, Bot. Not. 98. 1852. 

 Ranunculus drouetii F. Schultz, Arch. Fl. France et AUem. 10. 1842. 

 Type locality: Eiiropeaa. 



Range: Alaska to Vemiont, Rhode Island, and Lower California, in the Rocky- 

 Mountains south to New Mexico. 



New Mexico: Tunitcha Mountains; Taos; Negrito Creek; Middle Fork of the Gila. 

 In streams and ponds, in the Transition Zone. 



2. Batrachium. trichophyllum (Chaix) Bosch, Prodr. Fl. Bat. 5. 1850. 

 Ranunculus trichophyllus Chaix; Vill. Prosp. PI. Dauph. 1: 335. 1786. 

 Ranunculus aquatilis trichophyllus A. Gray, Man. ed. 6. 40. 1867. 

 Batrachium aquatile trichophyllum Cockerell, Univ. Mo. Stud. Sci. 2^: 122. 1911. 

 Type locality: European. 



Range: British America to North Carolina, California, and Mexico; also in Europe 

 and Asia. 

 New Mexico: Las Vegas; Vermejo Park. In water, in the Transition Zone. 



•S. Batrachium flaccidum. (Pers.) Rupr. Fl. Cauc. 15. 1869. 

 Ranunculus fiaccidus Pers. Ann. Bot. Usteri 14: 39. 1795. 

 Ranunculus trichophyllus fiaccidus A. Gray, Syn. Fl. 1': 21. 1895. 

 Type locality: Not stated. 



Rang]\: British America to North Carolina and Lower California. 

 New Mexico: Canada Creek; Pecos River; Mimbres River; Dulce. In streams and 

 ponds. 



8. RAITUNCULUS L. Buttercup. 



Annual or perennial herbs with alternate cauUne leaves and numerous basal ones; 

 flowers solitaiy or corymbose, yellow or white; sepals usually 5; petals commonly 

 conspicuous; achenes capitate, numerous, usually smooth. 



KEY TO THE SPECIES. 



Sepals black-hairy 1. R. macauleyi. 



Sepals not black-hairy. 

 Basal leaves entire. 



Plants with long stolons rooting at the nodes; petals less 



than 5 mm. long 10. i?. reptans. 



Plants not stole niferous; petals more than 5 mm, long, 



often 10 mm. or more 11. E. ellipticus. 



■ Basal leaves not entire. 



None of the leaves cleft; plants very succulent, stolon- 



iferous 2. R.hydrocharoides. 



At least part of the leaves cleft; plants less succulent, 

 seldom stoloniferous. 



Stems floating or submerged 3. R. purshii. 



Stems neither floating nor submerged. 

 Achenes glabrous. 



Petals short, 3 to 4 mm. long, about equal- 

 ing the sepals; cauline leaves long- 



petioled 4. R. eremogenes. 



Petals longer, 8 to 10 mm., much longer 



than the sepals; cauline leaves 



nearly sessile. 



Petals oblong, 8 to 10 mm. long; basal 



leaves parted almost to the 



base 5. R.nudatus. 



