FLOWERING PLANTS AND FERNS OF ARIZONA 401 



to October. New Mexico to southern California and northern 

 Mexico. 



The typical form, with leaflets rather sparsely sericeous beneath, 

 and var. atrorubens (Rydb.) Kearney and Peebles (P. atrorvbens 

 Rydb.), with leaflets densely silvery-sericeous beneath, are about 

 equally common. The type of this variety was collected in Arizona 

 (Rothrock 399). The var. sanguined (Rydb.) Kearney and Peebles 

 (P. sanguined Rydb.), with basal leaves subpinnate rather than 

 strictly digitate, as in the other forms, has been collected only in 

 Coconino County, at Walnut Canyon (MdcDougdl 331, the type 

 collection), and in Oak Creek Canyon (Fulton 9661). 



9. Potentilla monspeliensis L., Sp. PL 499. 1753. 



Kaibab Plateau, San Francisco Peaks, Flagstaff (Coconino County), 

 White Mountains (Apache and Greenlee Counties), 7,000 to 9,500 

 feet, wet meadows, June to August. Almost throughout North 

 America; probably introduced from Europe. 



10. Potentilk biennis Greene, Fl. Francisc. 65. 1891. 



Grand Canyon (Tourney 98), July. Saskatchewan to British 

 Columbia, south to Colorado, northern Arizona, and Baja California. 



11. Potentilla rivalis Xutt. ex Torr. and Grav, Fl. Xorth Amer. 1: 



437. 1840. 



San Francisco Peaks (Wooton in 1892), Bangharts Ranch (Del Rio), 

 Yavapai County (Rusby in 1883), Gila River bed, Sacaton, Pinal 

 County (Harrison and Peebles 1744, 1968), the last doubtless strays 

 from the mountains, April to July. Illinois to Washington, south to 

 Arizona, northern Mexico, and California. 



The var. millegrand (Engelm.) S. Wats. (P. millegrana Engelm.), 

 a smaller and more diffuse plant with basal leaves all digitately 

 3-foliolate (these usually pinnately 5- to 7-foliolate in typical P. 

 rivalis), was collected in "southern Utah, northern Arizona, etc." 

 (Palmer 143). 



12. Potentilla plattensis Xutt. ex Torr. and Grav, Fl. Xorth Amer. 1: 



439. 1840. 



Ivesia pinnatifidd S. Wats., Amer. Acad. Arts and Sci. Proc. 



20: 364. 1885. 

 Potentilld drizonicd Greene, Pittonia 1: 104. 1887. 



Flagstaff, Coconino County (Lemmon 3200, type collection of 

 Ivesid pinriaiifida) , White Mountains, Apache Countv (Goodding 

 1192, Kearney and Peebles 12421), 7,000 to 8,500 feet, moist grassy 

 meadows, July and August. Saskatchewan to New Mexico and 

 Arizona. 



The Arizona specimens apparently differ from most of the specimens 

 from farther east and north only in the more villous herbage. 



13. Potentilla crinita A. Grav, Amer. Acad. Arts and Sci. Mem. ser. 



2, 4: 41. 1849. 



Apache County to Coconino County, also in the Huachuca Moun- 

 tains (Cochise County), 6,000 to 8,000 feet, commonly in pine forests, 

 July to September (April and May in Cochise County). Colorado, 

 Utah, New Mexico, and Arizona. 



The var. lemmoni (S. Wats.) Kearney and Peebles (Ivesia lemmoni 

 S. Wats., Potentilld lemmoni Greene), occurs in the vicinity of Flag- 



