Proc. Amer. Acad. Arts8: 634. 1873
Varieties 2 (2 in the flora).
The two varieties were mapped as geographically intermingling in southern California (M. A. Lane 1988). Considerable variation in expression of vestiture occurs in the area where the hirtellous-leaved plants grow and identifications should be recognized as arbitrary.
|1||Leaf margins and faces hirtellous||Acamptopappus sphaerocephalus var. hirtellus|
|1||Leaf margins and faces glabrous, or margins sometimes hirtellous||Acamptopappus sphaerocephalus var. sphaerocephalus|