FLOWERING PLANTS AND FERNS OF ARIZONA 571 



taller stems, more deeply dissected leaf blades, and a less simple 

 inflorescence than in typical S. subhastata. 



12. Sphaeralcea parvifolia A. Xels., Biol. Soc. Wash. Proc. 17: 94. 



1904. 



Sphaeralcea arxzonica Heller ex Rvdb., Torrev Bot. Club Bui. 

 40: 59. 1913. 



Apache County to Mohave County, south to Yavapai and Gila 

 Counties, mostly 4,000 to 7,000 feet, dry slopes and mesas, usually in 

 the open, May to October, type of S. arizonlca from Flagstaff (Mac- 

 Dougal 120)/ Western Colorado to New Mexico, Arizona, and 

 eastern California. 



An extremely abundant plant in north-central and northern Arizona, 

 the roadsides often being colored red with its flowers. This species 

 superficially resembles S. incana but is distinguished by the whitish or 

 grayish (not yellowish) color of the stems and leaves, less virgate 

 inflorescence, smaller, more rounded leaf blades, flatter fruit, and less 

 cuspidate carpels. From forms of S. ambigua with contracted in- 

 florescence, S. parvifolia is distinguishable by its more numerous and 

 smaller flowers, fruit equaling or surpassing the calyx, and less galeate 

 and less prominently reticulate carpels. 



13. Sphaeralcea grossulariaefolia (Hook, and Arn.) Rvdb., Torrev Bot. 



Club Bui. 40: 58. 1913. 



Sida grossulariaefolia Hook, and Arn., Bot. Beechey Vov. 

 326. 1840. 



Apache County to Mohave, Yavapai, Gila, and Pinal Counties. 

 3.000 to 6.000 feet, mesas and slopes, often among junipers and pin- 

 yons, occasionally descending along streams to lower elevations. May 

 to October. Idaho and Washington to Xew Mexico, Arizona, and 

 California. 



This species is represented in Arizona only by var. pedata (Torr.) 

 Kearney (S. -pedata Torr.), which differs from the typical form in its 

 higher, narrower, more pointed carpels, which are often mucronate or 

 cuspidate, and 2-seeded. It closely resembles forms of S. rusbyi but 

 may usually be distinguished by its finer and denser pubescence and 

 shorter carpels. At the southern limit of its range in Arizona, 

 specimens suggesting hybridization with .8'. rusbyi have been collected. 



14. Sphaeralcea digitata (Greene) Rvdb., Torrev Bot. Club Bui. 40: 



58. 1913. 



Malvastrum digitatum Greene, Leaflets 1: 154. 1905. 



Apache County to eastern Coconino County, 4.000 to 7,000 feet, 

 well-drained slopes, often among junipers or pines. Western Texas 

 to southern Utah, northern Arizona, and northern Chihuahua. 



15. Sphaeralcea leptophylla (A. Gray) R}~db., Torrev Bot. Club Bui. 

 40: 59. 1913. 



Malvastrum leptophyllum A. Gray, PL Wright. 1: 17. 1852. 



Apache County to eastern Coconino County, 4.000 to 6,000 feet, 

 dry, rocky hills and mesas, in shallow soils. Southwestern Colorado, 

 southern Utah, Xew Mexico, northeastern Arizona, and Chihuahua. 



The silvery-lepidote pubescence and the very narrow, simple or 



