Bot. Misc.1: 19, plate 15. 1829
North America, Central America, s South America, e Asia.
Species 5 (1 in the flora).
Adenocaulon is well adapted for animal dispersal. The prominent glandular hairs on the cypselae are very sticky and cling readily to fabrics, fur, and feathers. The intercontinental disjunctions within the range of Adenocaulon are probably a result of dispersal of cypselae on the feathers of birds. Bird dispersal may also account for the intracontinental disjunctions of A. bicolor (in the Pacific Northwest, the Black Hills, and the northern Great Lakes region). An alternate hypothesis for the disjunctions of A. bicolor is a former transcontinental periglacial distribution that was broken apart by Holocene climatic changes.