The status of certain hawkweeds (Hieracium subgenus Pilosella) in Michigan

TitleThe status of certain hawkweeds (Hieracium subgenus Pilosella) in Michigan
Publication TypeJournal Article
Year of Publication1978
AuthorsVoss EG, Bohlke MW
JournalMichigan Botanist
Volume17
Pagination35-47
KeywordsVASCULAR PLANTS
Abstract

Among our best known, most colorful--and often most obnoxious--weeds are the yellow-headed and orange-headed hawkweeds which brighten roadsides and old fields in early summer. They first appeared in Michigan relatively recently, compared with most of our common weeds, but they have been conspicuously successful in getting established. The yellow-flowered plants have long presented taxonomic and nomenclatural problems: even if we knew where and how to separate species, we would not be sure what names to use for them. Hybrids between the common species have only recently been noted in the state. In the same subgenus, two additional species (distinguished from the common ones by their fewer and larger heads) occur rarely, and the time seems right for a review of past and present information on the distribution of Hieracium subgenus Pilosella in Michigan. This background and summary of where we stand may lead some ambitious person to investigate further the reproductive behavior and taxonomic identity of plants too common to be further ignored.