FLOWERING PLANTS AND FERNS OF ARIZONA 889 



15. Blades of the largest leaves much more than 12 mm. long, or 



else (B. desertorum) the leaves densely grayish-tornentellous, 



or (B. coulter i) the heads loosely cymose-panicled, on slender 



essentially naked pedicels (16). 



16. Leaves sharply 1- to 3-hastate-toothed at base, deltoid- or 



rhombic-ovate; heads slender-pedicelled, loosely panicled, 



about 17-flowered 14. B. coulteri. 



16. Leaves not sharply and hastately few-toothed at base I 1 7 . 

 17. Leaf blades rhombic-ovate, coriaceous, repand-toothed. 

 cuneate at base, 10 to 38 mm. long; phyllaries all 

 rounded or obtuse, firm, stramineous, often resinous. 



15. B. BACCHARIDEA. 



17. Leaf blades ovate, not coriaceous, crenate to dentate, 

 usuallv cordate or subcordate at base; phvllaries thin 

 (18). 

 18. Heads solitary or few, about 60-flowered: leaves tri- 

 angular-ovate, coarsely toothed; involucre about 13 



mm. high 22. B. simplex. 



18. Heads numerous, 8- to 38-flowered (19). 



19. Outer phyllaries with loose caudate-attenuate herba- 

 ceous tips; leaves thin, triangular-ovate, acuminate, 

 coarsely serrate or crenate-serrate: involucre about 



11 mm. high 21. B. graxdiflora. 



19. Outer phyllaries not caudate-attenuate (20). 



20. Pedicels densely stipitate-glandular; outermost phyl- 

 laries (a few of them) herbaceous, usually longer 

 than the next inner series, sometimes surpassing 



the heads 20. B. floribuxda. 



20. Pedicels not stipitate-glandular; outer phyllaries not 

 herbaceous or elongate (21). 

 21. Heads 28- to 35-flowered; leaves mostly deltoid- 

 or triangular-ovate, thin; heads slender-pedi- 

 celled, mostly nodding, in usually few-headed 

 cymose panicles at the tips of the stem and 



branches 19. B. fexdleri. 



21. Heads 8- to 18-flowered (22). 



22. Plant herbaceous; leaves 5 to 10 cm. long, 

 acuminate; heads slender-pedicelled, the 



panicles rather loose 18. B. rusbyi. 



22. Plants shrubby; leaves not more than 5 cm. long, 

 obtuse to acute; heads mostly subsessile, 

 clustered in the leaf axils, forming spikelike 

 panicles (23). 

 23. Phyllaries puberulous on the back; leaf blades 

 3 to 13 mm. long and wide, densely gray- 

 ish-tomentellous 16. B. DESERTORUM. 



23. Phyllaries essentially glabrous; leaf blades 10 

 to 50 mm. long and wide, green. 



17. B. CALIFORXICA. 



1. Brickellia longifolia S. Wats., Amer. Nat. 7: 301. 1S73. 



Coleoscmthus kmgifolius Kuntze, Rev. Gen. PL 1: 32S. 1891. 



North rim of the Grand Canyon and Havasu Canyon. Coconino 

 County (Eastwood and Howell 7080, Whiting in 1940). 3.300 to 

 8,000 feet, September. Southeastern Utah to eastern California and 

 •northern Arizona. 



2. Brickellia multiflora Kellogg, Calif. Acad. Sci. Proc, 7: 49. 1S77. 



Coleosanthus mvltiflorus Kuntze, Rev. Gen. PL 1: 328. 1891. 



North rim of the Grand Canyon. Coconino County {Eastwood and 

 Howell 7106), September. Southern Nevada, eastern California, and 

 northwestern Arizona. 



