FLOWERIXG PLANTS AND FERXS OF ARIZONA 927 



Gila County), 5,500 to 10,500 feet, coniferous forests, July to Sep- 

 tember, type of E. gvMelmi from Bill Williams Mountain (Palmer in 

 1869), type of E. subasper from the San Francisco Peaks (Purpus 

 8084), type of E. scaberulus from the White Mountains (Griffiths 

 5353). New Mexico and Arizona. 



The pubescence of the involucre is extremely variable in this species. 

 The type sheets of both E. gulielmi and E. subasper bear specimens 

 essentially identical in other characters, of which some are densely 

 hirsute or hirsutulous on the involucre, others densely glandular with 

 very few or no long hairs; and the type sheet of E. pecosensis shows a 

 similar but less extreme amount of variation. The species is one of 

 the complex E. ghbellus group, and a revisionary study might discover 

 an earlier name for it. 



9. Erigeron concinnus (Hook, and Arn.) Torr. and Grav, Fl. North 



Amer. 2: 174. 1841. 



Distasis (?) concinna Hook, and Arn., Bot. Beechev Vov. 350. 

 1840. 



Northern Apache County to northern and eastern Mohave County 

 and northern Yavapai County, 4,000 to 8,000 feet, dry sandy or 

 stony mesas and slopes, with pine and juniper, April to October. Mon- 

 tana to British Columbia, south to New Mexico, Arizona, and 

 California. 



The var. aphanactis A. Gray, with rayless heads, has been collected 

 in Apache County, at the north end of the Carrizo Mountains (Stand- 

 ley 7465) and near Rock Point (Peebles and Smith 13536). The var. 

 condensatus D. C. Eaton, a dwarf subscapose form, occurs in Navajo 

 County. 



10. Erigeron perglaber Blake, Wash. Acad. Sci. Jour. 30: 471. 1940. 

 Known onlv from a collection from Arizona, without definite locality 



(Palmer in 1869). 



The plant has the appearance of Erigeron concinnus, but is gla- 

 brous. 



11. Erigeron compositus Pursh, Fl. Amer. Sept. 535. 1814. 



The Arizona form is var. multijidus (Rydb.) Macbr. and Payson 

 (E. multijidus Rydb.). San Francisco Peaks, Coconino County, 

 11,500 feet (Little 4750). Greenland to Alaska, south to Colorado, 

 northern Arizona, and California. 



12. Erigeron pringlei A. Grav, Amer. Acad. Arts and Sci. Proc. 17: 



210. 1882. 

 Oak Creek Canyon (Coconino County), Natural Bridge, Pine, Sierra 

 Ancha, Mazatzal Mountains (Gila County), Santa Rita Mountains 

 (Pima County), 5,000 to 9,000 feet, ledges of cliffs and rock crevices 

 in canyons, May to July, type from Mount Wrightson, Pima County 

 (Pringle in 1881) . Known only from central and southern Arizona. 



13. Erigeron ursinus D. C. Eaton in King, Geol. Expl. 40th Par. 5: 



148. 1871. 

 Kaibab Plateau, Coconino County, 8,500 to 9,000 feet (Cottam 

 2675, Collom in 1940). Montana and Idaho to Colorado, Utah, north- 

 ern Arizona, and California. 



286744° — 12 59 



