Please try our next iteration of the Michigan Flora Online here. Beginning on February 1, 2023, michiganflora.net will point to this new site.
The new site offers several benefits over the existing website, including real coordinate mapping, giving a clearer view of the density of documentation as well as more precision about plant distributions and their link to landforms. We will also have the ability to update species pages more regularly, both in terms of new collections and as more existing Michigan specimens are georeferenced. In addition, we have a better photo display, and offer indented keys.
Coefficient of Conservatism:
Coefficient of Wetness:
KING DEVIL, YELLOW HAWKWEED
Like H. aurantiacum, almost everywhere, especially along roadsides and in fields; railroads, gravel pits, and disturbed places of all kinds; invading dry forests, plantations, sandy and rocky openings, shores, even wet ground.
This is a European species, introduced a little more recently than H. aurantiacum and now about equally abundant in northern Michigan, where the two often dominate old fields and roadsides. The first Michigan collection is from Houghton Co. in 1914; it spread rapidly in the Copper Country. No collections from south of the Straits of Mackinac were noted before 1935 (Mackinaw City).
Our plants are quite variable and sometimes distinguished only with difficulty from H. caespitosum, which generally is a much hairier species on stems and leaves, with larger heads and darker, gland-tipped hairs among the dense stellate pubescence, especially on pedicels. Some plants referred to H. piloselloides have large heads on rather densely stellate pedicels, but with leaves and stems nearly glabrous. These and assorted other ambiguous plants (such as a very few hairy ones referred to H. caespitosum despite smaller heads than usual for that species) could result from hybridization.