FLOWERING PLANTS AND FERNS OF ARIZONA 633 



Assiniboia to Texas and eastern Arizona, ranging widely over the 

 plains east of the Rocky Mountains. 



25. Oenothera refracta S. Wats., Amer. Acad. Arts and Sci. Proc. 



17: 373. 1882. 



Sphaerostigma refractum Small, Torrey Bot. Club Bui. 23: 192. 

 1896. 



Mohave and Yuma Counties, below 4,000 feet, frequent on open 

 deserts, March to May, type from gravelly hills on the Colorado 

 (Bigeloiv). Southern Utah and western Arizona to California. ■ 



26. Oenothera chamaenerioides A. Gray, PI. Wright. 2:58. 1853. 



Sphaerostigma chamaenerioides Small, Torrey Bot. Club Bui. 

 23: 189. 1896. 



Yavapai and Mohave Counties to Greenlee, Santa Cruz, Pima, and 

 Yuma Counties, below 5,500 feet, open deserts, February to May. 

 Texas to Utah, Arizona, and California. 



27. Oenothera decorticans (Hook, and Arn.) Greene, Fl. Francisc. 217. 



1891. 



Sphaerostigma decorticans Small, Torrey Bot. Club Bui. 23:191. 

 1896. 



Mohave, Maricopa, Pima, and Yuma Counties, below 2,500 feet, 

 open deserts, March to May. Utah and Nevada to western Arizona 

 and southeastern California. 



The form occurring in Arizona is var. condensata Munz. 



28. Oenothera boothii Dougl. ex Hook., Fl. Bor. Amer. 1: 213. 1834. 



Sphaerostigma boothii Walp., Repert. Bot. 2: 77. 1843. 



On and near the San Francisco Peaks, Coconino County (KnovAton 

 200, Leiberg 5808). Eastern Washington to northern Arizona and 

 California. 



29. Oenothera contorta Dougl. ex Lehm. in Hook., Fl. Bor. Amer. 



1: 214. 1834. 



Sphaerostigma contortum Walp., Repert. Bot. 2: 78. 1843. 



Fort Huachuca, Cochise County {Wilcox in 1892-3). 



Represented in Arizona by var. epUobioides (Greene) Munz, char- 

 acterized by almost linear leaves, small yellow flowers, and narrow 

 cylindric capsules. This variety occurs in southern Arizona, Cali- 

 fornia, and Baja California. 



30. Oenothera micrantha Hornem. ex Spreng., Svst. Yeg. 2 : 228. 



1825. 



Sphaerostigma micranthum Walp., Repert. Bot. 2: 77. 1S43. 



Grand Canyon (Coconino County) and in Yavapai. Mohave. Gila. 

 Pinal, and Maricopa Counties, below 4,500 feet, deserts. March to 

 May. 



The form that occurs in Arizona is var. exfoliata (A. Nels.) Munz 

 {Sphaerostigma pallidum Abrams), which occurs in Arizona and south- 

 eastern California. 



