FLOWERING PLANTS AND FERNS OF ARIZONA 329 



4. Ranunculus sceleratus L., Sp. PL 551. 1753. 



Sacaton (Final County), about 1,200 feet, in wet places, May to 

 August. Canada and Alaska, south to Florida, New Mexico, and 

 Arizona; Eurasia. 



The species is represented in Arizona by the western var. multifidus 

 Nutt. (R. eremogenes Greene). The acrid juice of R. sceleratus is said 

 to have been used by beggars to induce sores. It is also reported that 

 livestock eating this plant may develop severe intestinal inflammation. 

 The active principle (anemonal) is reputed to be a cardiac poison. 

 The species is too rare in Arizona to make these undesirable properties 

 important. 



5. Ranunculus flammula L., Sp. PL 548. 1753. 



Jacobs Lake, Kaibab Plateau, 8,340 feet (Kearney and Peebles 

 13705, 13706), May to August. Canada and Alaska, south to New 

 Jersey, New Mexico, northern Arizona, and California; Eurasia. 



A creeping perennial. The western form that occurs in Arizona is 

 R.JUiformis Michx. var. ovalis Bigel. 



6. Ranunculus hydrocharoides A. Grav, Amer. Acad. Arts and Sci. 



Mem. ser. 2, 5: 306. 1855. 



San Francisco Peaks (Coconino County) to the Chiricahua Moun- 

 tains (Cochise County), 6,800 to 9,500 feet, marshes, streams, and 

 springs in the yellow pine belt, June to September. Southwestern 

 New Mexico, Arizona, eastern California, and Mexico. 



An aquatic or palustrine perennial, represented in Arizona by both 

 the typical form, with entire radical leaves and ovate or cordate-ovate 

 stem leaves, and by var. stolonijer (Hemsl.) L. Benson (R. stolonifer 

 HemsL), with dentate radical leaves and lanceolate or oblanceolate 

 stem leaves. The variety has been collected in the White Mountains 

 (Apache and Greenlee Counties) and on the San Francisco Peaks 

 (Coconino County). 



7. Ranunculus macranthus Scheele, Linnaea 2: 585. 1848. 

 Eastern Arizona from the White Mountains (Apache County) to 



the Huachuca Mountains (Cochise County), 6,000 to 7,500 feet, in 

 yellow pine forests, June to July. Western and southern Texas, 

 eastern Arizona, and Mexico. 



The showiest buttercup in Arizona, worthy of cultivation as an 

 ornamental. 



8. Ranunculus macounii Britton, N. Y. Acad. Sci. Trans. 12: 3. 1892. 

 San Francisco Peaks (Coconino County) to the White Mountains 



(Apache County), 6,000 to 8,00Q feet, usually in yellow pine forests, 

 summer. Labrador to Alaska, south to Minnesota, New Mexico, and 

 Arizona. 



Subpalustrine perennial, creeping in mud and, in the form occurring 

 in Arizona, rooting adventitiously. 



9. Ranunculus pennsylvanicus L. f., Sup. 272. 1781. 



Vicinity of Flagstaff (Coconino County), East Fork of White River 

 (Apache or Navajo County), 6,000 to 8,000 feet, woods or bottom 

 lands, summer. Newfoundland to Alaska, south to New Jersey, 

 Missouri, New Mexico, and Arizona; China. 



