FLOWERING PLANTS AND FERXS OF ARIZONA 911 



Mexico, and Baja California. The following key to the Arizona forms 

 is based on Hall and Clements' monograph (see footnote 63, p. 908). 



Key to the varieties 



1. Involucre glabrous, or the margins of the phyllaries sometimes ciliate (2). 



2. Achenes glabrous var. abbreyiatus. 



2. Achenes densely pubescent (3). 



3. Leaves linear, 1 to 2 mm. wide, persistent var. graveolexs. 



3. Leaves linear-filiform, less than 1 mm. wide, soon deciduous in var. 

 junceus (4). 

 4. Plant essentially leafless; phyllaries in very distinct vertical rows; 

 corolla teeth thinly long-pilose, at least when young. 



var. JUNCETTS. 

 4. Plant leafy; phyllaries in less distinct vertical rows; corolla teeth glabrous. 



var. coxsimilis. 

 1. Involucre more or less tomentose or tomentulose, at least on the outer phyl- 

 laries (5). 

 5. Achenes glabrous (6). 



6. Phyllaries acute or subacuminate; corolla 9 to 10 mm. long. 



var. bigelovii. 



6. Phyllaries obtuse; corolla 10 to 12 mm. long var. glareosus. 



5. Achenes densely pubescent (7). 



7. Branches clothed with a dense, clear white tomentum; inner phyllaries 



obtuse, glabrous var. latisquameus. 



7. Branches with a yellowish or dull white tomentum (8). 



8. Involucre 10 to 12 mm. high, the phyllaries obtuse, in very distinct 

 vertical ranks; corolla 10 to 12 mm. long, the teeth villous. 



var. turbixatus. 



8. Involucre 7 to 9 mm. high, the phyllaries acute, the vertical ranks not 



very sharply defined; corolla 7 to 9 mm. long, the teeth glabrous. 



Var. GXAPHALODES_ 



Var. abbreviates (Jones) Blake (C. leiospermus (A. Gray) Greene, 

 C. Miuseosus var. leiospermus (A. Gray) H. M. Hall) occurs 19 miles 

 west of Cameron and on the south side of the Grand Canyon, Coconino 

 County (Kearney and Peebles 12816, Eastwood and Howell 7071), 

 about 6,000 feet, dry slopes, September. 



Var. graveolens (Xutt.) H. M. Hall (C. graveolens (Xutt.) Greene) 

 ranges from Apache County to Hualpai Mountain (Mohave County), 

 2,000 to 7.000 feet, mesas and slopes, July to September. 



Var. junceus (Greene) H. M. Hall (C. junceus Greene) is found from 

 Cameron to the Grand Canyon (Coconino County), near Kingman 

 (Mohave County), along the Gila River, eastern Greenlee County 

 (Greene in 1880, the type collection), 3,500 to 5,500 feet, often on 

 limestone bluffs, September and October. Known only from Arizona. 



Var. consimilis (Greene) H. M. Hall (C. txmsimilis Greene) occurs in 

 Navajo, Coconino, eastern Mohave, and Yavapai Counties, also in 

 foothills of the Santa Rita Mountains (Pima County), 4,000 to 7,000 

 feet, valleys, plains, and mesas, often in saline soil, July to November, 

 type from the base of the San Francisco Peaks (Greene in 1895). 



Var. bigelovii (Gray) H. M. Hall (C. bigelovii (A. Gray) Greene, C. 

 moquianus Greene) extends from northern Apache and northern 

 Navajo Counties to the vicinity of Flagstaff (Coconino County). 

 4.500 to 7,000 feet, dry slopes and mesas, July to September, type of 

 C. moguianus from the Hopi Indian Reservation (Zuck in 1897). 



Var. glareosus (M. E. Jones) H. M. Hall (C. glareosus (M. E. Jones) 

 Rydb.). A collection on the Little Colorado River (ThurberC) inl851) 

 is cited by Hall. 



Var. laiisquameus (A. Gray) H. M. Hall (C. laiisquameus (A. Gray) 



2SG744 : — 42— 5S 



