714 MISC. PUBLICATION 42 3, U. S. DEPT. OF AGRICULTURE 



The subsp. prostrata (E. Nels.) Wherry (P. austromontana var. 

 prostrata E. Nets., P. acerba A. Nels.) occurs in northern Coconino and 

 western Graham Counties. The subsp. vera Wherry occurs in 

 Coconino, Yavapai, and Mohave Counties. The subsp. densa (Brand) 

 Wherry (P. densa Brand), is found in Navajo, Coconino, and Mohave 

 Counties. 



4. Phlox covillei E. Nels., Rev. Phlox. 15. 1899. 

 Northwestern corner of Mohave County, 4,000 feet, dry sandy 



barrens, early spring. Nevada, northwestern Arizona, and California. 

 The original material of this species has the pubescence partly 

 glandular, but the phase occurring in Arizona and eastern Nevada is 

 wholly eglandular. Further study may show the latter to constitute 

 a different subspecies. 



5. Phlox diffusa Benth., PL Hartw. 325. 1849. 



Northern Apache and Coconino Counties, 6,000 to 9,000 feet, 

 plateaus and canyon rims, on rock ledges and gravelly slopes, late 

 spring. Idaho and Washington to northern Arizona and southern 

 California. 



The Arizona plants belong to subsp. subcarinata Wherry, which 

 forms mats densely covered with soft, bright-green or exceptionally 

 grayish, linear-subulate leaves, producing an abundance of white to 

 pink flowers. The typical subspecies, which differs in being less 

 compact and in having flat intercostal calyx membranes, grows chiefly 

 in the California Sierras. 



6. Phlox hoodii Richards., Bot. App. Frankl. Journ. 733. 1823. 

 Northwestern corner of Mohave County, 4,000 feet, dry sandy 



barrens, early spring. Western North America. 



This widespread species reaches its southern limit in Arizona, where 

 it is represented by a small-leaved variant (P. muscoides Nutt.), 

 apparently only an ecologic form. The longer-leaved P. hoodii subsp. 

 canescens (T. and G.) Wherry is also to be looked for in northernmost 

 Arizona. 



7. Phlox tenuifolia E. Nels., Rev. Phlox 27. 1899. 



Phlox gilioides A. Nels., Wyo. Univ. Pubs. Bot. 1: 127. 1926. 



Roosevelt (Gila County), to the mountains of Cochise and Pima 

 Counties, 1,500 to 5,000 feet, rocky slopes, flowering in spring and 

 rarely again in autumn, type from the Santa Catalina Mountains 

 {Pringle in 1881). Known only from Arizona. 



When growing in the open, the plants form tufts of slender, woody- 

 based stems up to 75 cm. long, bearing sparse small leaves. In partial 

 shade the stems elongate, supporting themselves on other shrubs and 

 attaining a length of 1.2 m. The white to lavender, strongly scented 

 flowers are unique in the genus in having the corolla tube funnelform. 



8. Phlox clutena A. Nels., Amer. Bot. 28: 24. 1922. 

 Lukachukai Mountains (Apache County), Keet Seel, etc. (Navajo 



County), Navajo Mountain (Coconino County), 6,000 to 10,000 feet, 

 pine forests, late spring and early summer. Southern Utah and 

 northeastern Arizona. 



The slender rootstocks creep through the humus of the forest floor, 

 producing numerous clusters of evergreen leaves. The flowers are 

 large and brilliantly phlox purple. 



