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



longipes M. E. Jones) is found in the Grand Canyon region (Coconino 

 County) and in Mohave County. The subsp. compacta (Brand) 

 Wherry (P. stansburyi subsp. compacta Brand), which intergrades to 

 some extent with P. amabilis, occurs throughout the range of the 

 species in Arizona. 



13. Phlox amabilis Brand, Pflanzenreich IV. 250: 74. 1907. 



Phlox longifolia var. brevifolia A. Gray, Syn. Fl. 2 1 : 133. 1878. 

 Phlox stansburyi subsp. eu-stansburyi var. brevifolia sub var. 



microcalyx Brand, Pflanzenreich IV. 250: 67. 1907. 

 Phlox grayi Woot. and Standi., Contrib. U. S. Natl. Herbarium 



16: 161. 1913. 

 Phlox visenda A. Nels., Amer. Jour. Bot. 18: 434. 1931. 



Southern Navajo County to Mohave County, south to Santa Cruz 

 County, 4,000 to 9,000 feet, dry gravelly slopes, spring and occasion- 

 ally autumn, type of P. amabilis from near Prescott, Yavapai County 

 (E. Palmer 391), type of P. visenda from Grand view, Coconino County 

 (A. Nelson 10219). Western New Mexico, Arizona, southern Utah, 

 Nevada, and eastern California. 



Phlox amabilis is a low plant with thick oblong leaves, and when, as 

 is often the case, its corolla lobes are deeply notched, it bears a striking 

 resemblance to P. woodhousei. In the former, however, the stamens 

 and styles are nearly as long as the corolla tube, whereas in the latter 

 they are much shorter than the tube. The real difficulty lies in the 

 intergradation between P. amabilis and P. longifolia compacta, inter- 

 mediates between these being met with more frequently than is usually 

 the case when two plants are really independent species. The broad, 

 thick, short-acuminate to acute, or even obtusish leaves of P. amabilis 

 are, however, so unlike the narrow, thin, long-acuminate leaves of the 

 several subspecies of P. longifolia that the views of the more recent 

 workers as to their distinctness are here accepted. 



2. COLLOMIA 



Plants annual; leaves sessile, the blades entire, linear to lanceolate 

 or the floral ones sometimes ovate; flowers in dense terminal leafy 

 heads; corolla regular, funnelform-salverform, the tube long and 

 slender; stamens unequally inserted; seeds mucilaginous in water. 



Key to the species 



1. Corolla purplish, 6 to 15 mm. long and about twice as long as the calyx, with 

 a narrow throat and a small limb; calyx usually less than 7 mm. long, the 

 lobes subulate or narrowly lanceolate, acute 1. C. linearis. 



1. Corolla salmon pink or apricot color, usually at least 20 mm. long and thrice 

 as long as the calyx, with an ample throat and limb; calyx 7 mm. long or 

 longer, the lobes ovate-lanceolate, obtusish 2. C. grandiflora. 



1. Collomia linearis Nutt., Gen. PL 1: 126. 1818. 



Kaibab Plateau to Oak Creek (Coconino County), 6,500 to 8,500 

 feet, July and August. Quebec to British Columbia, south to Colorado, 

 Arizona, and California. 



2. Collomia grandiflora Dougl. ex LindL, Bot. Reg. 14: pi. 1174. 1828. 

 North rim of the Grand Canyon (Coconino County), mountains of 



Gila County, 3,400 to 8,000 feet, mostly in coniferous forests but some- 



