972 MISC. PUBLICATION 4 2 3, U. S, DEPT. OF AGRICULTURE 



4. Perityle ciliata (L. H. Dewey) Rydb., North Amer. Fl. 34: 17. 



1914. 



Laphamia ciliata L. H. Dewey, Bot. Gaz. 20: 425. 1895. 



Coconino, Yavapai, Gila, and Pima Counties, 3,000 to 7,000 feet, 

 rocky slopes, May to November, type from near Pine, Gila County 

 (MacDougal 676). Known only from central and southern Arizona. 



Perityle ciliata may be only a stunted form of P. spilanthoides, 

 with fewer and rather larger, shorter-peduncled heads and thicker 

 leaves with conspicuously immersed glands. 



5. Perityle coronopifolia A. Gray, PL Wright. 2: 82. 1853. 



Laphamia coronopifolia Hemsl., Biol. Cent. Amer. Bot. 2: 

 210. 1881. 



Mountains of Cochise, Santa Cruz, and Pima Counties, 4,000 to 

 7,500 feet, among rocks and on cliffs, often on limestone, June to 

 October. Southern New Mexico, southern Arizona (and Chihuahua?) . 



84. LAPHAMIA 



Plants low, suffruticulose ; leaves toothed, lobed, or parted, rarely 

 entire, at least the lower ones opposite; heads small or medium-sized, 

 radiate or discoid, yellow or the rays white; achenes strongly com- 

 pressed, not ciliate, rarely callous-margined; pappus of 1 or 2 bristle- 

 like awns, or wanting. 



Key to the species 



1. Leaves entire or merely toothed (2). 



2. Principal leaves spatulate or oblanceolate, varying to elliptic-ovate, usually 



entire 1. L. toumeyi. 



2. Principal leaves ovate, usually toothed (3) . 



3. Stem hirtellous; leaf blades not more then 8 mm. wide, repandly 3- to 



5-toothed 2. L. congesta. 



3. Stem short-pilose or pilosulous; leaf blades mostly 10 to 18 mm. wide, 



sharply several- toothed 3. L. palmeri. 



1. Leaves lobed or parted (4). 



4. Heads radiate; stem essentially glabrous (5). 



5. Rays white; larger leaves 3-parted, with short ovate or oblong segments. 



4. L. GILENSIS. 



5. Rays yellow; leaves dissected into elongate linear or filiform divisions. 



5. L. SAXICOLA. 



4. Heads discoid; stem pilosulous to villous (6). 



6. Leaves pedately 3-parted or 3-lobed with relatively broad chiefly entire 



divisions, these up to 2.5 mm. wide 6. L. gracilis. 



6. Leaves lobed or pedately parted, with numerous small ultimate divisions. 



7. L. DISSECTA. 



1. Laphamia toumeyi Robins, and Greenm., Amer. Jour. Sci. ser. 3, 



50: 176. 1895. 



Monothrix toumeyi Rydb., North Amer. Fl. 34: 20. 1914. 



Grand Canyon (Coconino County), both rims, 5,000 to 7,000 feet, 

 dry ground among rocks, June to October, type from the Grand 

 Canyon (Tourney in 1892). Known only from northern Arizona. 



2. Laphamia congesta M. E. Jones, Calif. Acad. Sci. Proc. ser. 2, 5: 



703. 1895. 



Monothrix congesta Rydb., North Amer. Fl. 34: 20. 1914. 



Northern Coconino County and northern Mohave County, 6,200 

 to 7,000 feet, clefts of rocks, June to September, type from below the 



