Heterotheca camporum (Greene) Shinners is the eastern most member of sect. Phyllotheca. The typical variety is similar to H. villosa. Semple (1983) presented data that indicated var. glandulissimum Semple is likely very recently evolved with a very rapid range expansion in the last 100 years. The species is tetraploid (2n=36). See Semple (2006 FNA).
Plants 35–70 cm; distal stems and peduncles eglandular or sparsely to moderately stipitate-glandular; distal leaves moderately to densely hispido-strigose, usually eglandular, rarely sparsely stipitate-glandular; prairies, sandy banks, limestone bluffs, ledges, along the Mississippi River ...... var. camporum
Plants 35–140 cm; distal stems and peduncles moderately to densely stipitate-glandular; distal leaves moderately hispido-strigose, sparsely to moderately stipitate-glandular; roadsides, disturbed sandy habitats, stream banks, glades ..... var. glandulissimum
Semple, J.C. 1983. Range expansion of Heterotheca camporum (Compositae: Astereae) in the southeastern United States. Brittonia 35: 140-146.
Last revised 21 April 2025 by J.C. Semple
© 2025 J.C. Semple, including all photographs unless otherwise indicated
1-4. Heterotheca camporum. 1. Small plant, var. camporum, Semple & Broullet 7380, Fulton Co., Illinois. 2. Large plants, var. glandulissimum, Semple & Chmielewski 9122, Davidson Co., Tennessee. 3-4. Large plant and heads, var. glandulissimum, cult Waterloo from Tennessee.