WOOTON AND STANDLEY FLOEA OF NEW MEXICO. 251 



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

 Ranunculus drouetii F. Schultz, Arch. PI. France et Allem. 10. 1842. 

 Type locality: European. 



Range: Alaska to Vermont, 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. 5. 40. 1867. 

 Batrachium aquatile trichophyllum Cockerell, Univ. Mo. Stud. Sci. 2 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. 



3. Batrachium flaccidum (Pers.) Rupr. Fl. Cauc. 15. 1869. 

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

 Ranunculus trichophyllus Jlaccidus A. Gray, Syn. Fl. I 1 : 21. 1895. 

 Type locality: Not stated. 



Rangh - . British America to North Carolina and Lower California. 

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

 ponds. 



8. RANUNCULUS L. Buttercup. 



Annual or perennial herbs with alternate cauline leaves and numerous basal oik-?; 

 flowers solitary 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. R. reptans. 



Plants notstoloniferous; petals more than 5 mm. long, 



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



Basal loaves not entire. 



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



ifcrous 2. R. hydroeharoides. 



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 Kkibrous. 



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

 ing tin' Bepals; cauline leaves long- 



petioled •>. R.eremog< 



Petals longer, 8 to 10 mm., much I"ii 

 than the sepals; cauline lean 

 nearly Bessile. 



Petals oblong. 8 to H> nun. long; basal 



Leaves parted almost t" the 



baeo 5. R. nudtttut. 



