FLOWERING PLANTS AXD FERNS OF ARIZONA 713 



4. Leaves thinnish, soft, scarcely acerose (6). 



6. Herbage bright- (rarely gray-) green, glabrate to moderately pubescent; 

 leaves linear-subulate, the larger ones often more than 1 mm. wide; 



calyx intercostaJly somewhat carinate 5. P. diff' 



6. Herbage gray green, canescent to arachnoid-tomentose, rarely glabrate: 

 leaves subulate, rarely more than 1 mm. wide; calyx intercostally 



flat 6. P. hoodii. 



1. Shoots tending to be elongate and little-branched, and the inflorescence to be 

 compound: Elate phloxes (7). 



7. Corolla fuunelform; leaves small and sparse 7. P. texuifolia. 



7. Corolla salverform (8). 



8. I Underground parts chiefly long slender rootstocks, terminating in cluster? 

 of evergreen leaves, from which arise the flowering shoots of the next 

 season; leaves mostly narrowly elliptic and obtusish; calyx inter- 

 costally flat 8. ' P. CLUTEXA. 



8. Underground parts chiefly taproots; leaves deciduous, or a few cauline 

 ones evergreen (9). 

 9. Styles short, not equaling the sepals (10). 



10. Woody tissue well developed: petals notched. 9. P. woodhousei. 



10. Woody tissue little developed; petals entire 10. P. nana. 



9. Styles elongate, exceeding the sepals (11). 



11. Corolla tube 20 to 25 mm. long 11. P. staxsburyi. 



11. Corolla tube 12 to 18 mm. long (12). 



12. Calyx intercostally bulging-carinate ; leaves tending to be long- 

 acuminate and thin 12. P. LOXGIFOLIA. 



12. Calyx intercostally flat to moderately carinate; leaves tending to 

 be short-acuminate and thick 13. P. amabilis. 



*1. Phlox gladiformis (M. E. Jones) E. Nels., Rev. Phlox 21. 1899. 



Phlox longifolia var. gladiformis M. E. Jones, Calif. Acad. 



Sci. Proc. ser. 2. 5: 711. 1895. 

 PJdox gooddingii A. Nels. and Kenn., Muklenbergia 3: 141. 



1908. 

 Phlox caesia Eastw., Leaflets West. Bot. 2: 54. 1937. 



Although not vet actually collected in Arizona, this Phlox occurs so 

 near the State border? in both Nevada and Utah that it seems likely 

 to be found here. It is a cespitose plant characterized by having the 

 herbage and even the corolla tube densely covered with gland-tipped 

 hairs that emit a musky odor. 



*2. Phlox caespitosa Nutt., Acad. Nat. Sci. Phila. Jour. 7: 41. 1834. 

 This Phlox grows in Nevada, Utah, and Colorado, not far from the 

 Arizona line, and its occurrence in Arizona is to be expected. The 

 plants are pulvinate, with linear-subulate, coarsely ciliate leaves. 



3. Phlox austromontana Coville, Contrib. U. S. Natl. Herbarium 4: 



151. 1893. 



Northern and central Arizona, also in Graham County, up to 8.000 

 feet, rocky slopes. Idaho and Oregon to northwestern New Mexico, 

 Arizona, California, and Mexico. 



This species forms grayish-green prickly cushions and mats, more 

 or less pubescent with fine eglandular bans, the flowers pink or white. 



Key to the subspecies 



1. Plant spreading, with long-decumbent stems: longest leaves 15 to 30 mm. long: 

 corolla tube 12 to 18 mm. long; styles 4.5 to 6 mm. long. 



Bllbsp. PROSTRATA. 



1. Plant compact: corolla tube 8 to 14 mm. long; styles 2.5 to 6 mm. long (2). 

 2. Stems short-decumbent or erect; longest leaves 12 to 20 mm. long. 



BUbsp. VER \. 



2. Stems short; longest leaves 8 to 12 mm. long subsp. den^a. 



