328 MI&C. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



13. Stems not scapose, branching near the base; nectary scale 

 obdeltoid; achene beak recurved; blades of the radical 

 leaves cordate, 1 to 6 cm. long, 1 to 5 cm. wide, not 

 markedly longer than wide and not very deeply cordate 



at base 13. R. cardiophyllus. 



13. Stems scapose, rarely branching near the base; nectary 

 scale rectangular or nearly so; achene beak straight (14). 

 14. Scapes each 4- or more- (usually 8- to 12-) flowered; 

 leaf bases remarkably fibrous after withering; margins 

 of the nectary scale free along their distal third; 

 petals 2 to 3 times as long as wide, not emarginate; 

 fruiting receptacle cylindric, slender. 



14. R. ARIZONICUS. 

 14. Scapes 1- to 3- or 4-flowered; leaf bases not very 

 fibrous; margins of the nectary scale adnate to the 

 petal almost their entire length; petals nearly as wide 

 as long, sometimes emarginate; fruiting receptacle 

 ovoid or ovoid-cylindric, stout; blades of the radical 

 leaves cordate or long-ovate, rarely subsagittate, 1.5 

 to 4.5 cm. long, 1 to 4 cm. wide, longer than wide and 

 often deeply cordate at base: var. subsagittatus. 



13. R. CARDIOPHYLLUS 



1. Ranunculus aquatilis L., Sp. PL 556. 1753. 



Apache County to Coconino, eastern Yavapai, and northern Gila 

 Counties, 5,000 to 7,000 feet, ponds and streams in the yellow pine and 

 sagebrush belts. Almost throughout North America; Eastern 

 Hemisphere. 



An aquatic perennial flowering in late spring and summer. The 

 form occurring in Arizona is var. capillaceus DC. (R. trichophyllus 

 Chaix, R. subrigidus Drew). 



Ranunculus circinatus Sibth. (R. longirostris Godr.) was collected by Sutton 

 Hayes (A T o. 7) on the El Paso and Fort Yuma Wagon Road Expedition, perhaps in 

 Arizona. It is characterized by a persistent achene beak about 1 mm. long (this 

 deciduous in R. aquatilis and its varieties), by the origin of the leaf divisions within 

 the dilated leaf base instead of from a petiole beyond it, and by the leaves not 

 collapsing when withdrawn from water. However, it is to be noted that these 

 leaf characters vary in forms of R. aquatilis var. capillaceus. 



2. Ranunculus juniperinus M. E. Jones, Calif. Acad. Sci. Proc. ser. 



2, 5: 616. 1895. 



Ranunculus andersonii A. Gray, var. tenellus S. Wats, in 



King, Geol. Expl. 40th Par. 5: 7. 1871. 

 Beckwithia juniperina Heller , Muhlenbergia 1: 144. 1906. 



Virgin Mountains, Mohave County (Goodding 2135), 5,000 to 6,000 

 feet, rocky slopes in the juniper-piny on belt, May. Utah to eastern 

 Nevada and northwestern Arizona. 



3. Ranunculus cymbalaria Pursh, Fl. Amer. Sept. 392. 1814. 

 Northern, central, and eastern Arizona, commonly 5,000 to 7,000 



feet but sometimes lower, along streams and about springs in the 

 yellow pine, sagebrush, juniper-piny on, and oak belts. Alberta to 

 Vancouver Island and south to Kansas, Arizona, California, and 

 central Mexico. 



A stolonif erous perennial with erect flowering stems, flowering in the 

 late spring and summer. It is called desert crowfoot. The Arizona 

 plant is var. saximontanus Fernald. 



