Additional
Information: Canadian Content has no additional information.
Heterotheca Sites:
Goldenasters Goldenasters: Scientific discussion of the group, which includes Braduria, Chrysopsis, Croptilon, Heterotheca, Noticastrum, Pityopsis, and Tomentaurum and is sometimes lumped together into Heterotheca. (Heterotheca) http://www.science.uwaterloo.ca/biology/jcsemple/goldenasters.htm