Crataegus douglasii
Douglas's hawthorn
Image of Crataegus douglasii

Photo by Janet K. Marr 

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Key Characteristics

Small tree (up to 12 m) of rocky woodlands primarily of the UP; leaves broadly elliptical, with shallow lobes and serrated margins; thorns short (<2.5 cm); fruits distinctively purplish-black.

Status and Rank

  • State Status: SC
  • State Rank: S3S4
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Alger51994
Alpena21930
Baraga21969
Chippewa41981
Houghton92008
Keweenaw302014
Luce11974
Mackinac11913
Marquette11937
Ontonagon32004
Distribution map for Crataegus douglasii

Updated 1/31/2017. Information is summarized from MNFI's database of rare species and community occurrences. Data may not reflect true distribution since much of the state has not been thoroughly surveyed.

Habitat

Found on rocky and bedrock outcrop shorelines in northern Michigan (conglomerate or basalt substrates). Also known from thin-soiled bedrock glades and balds in near-shore areas and hilltops, often in shrubby thickets. This species often persists in disturbed areas.

Natural Community Types

Methodology

For each species, lists of natural communities were derived from review of the nearly 6,500 element occurrences in the MNFI database, in addition to herbarium label data for some taxa. In most cases, at least one specimen record exists for each listed natural community. For certain taxa, especially poorly collected or extirpated species of prairie and savanna habitats, natural community lists were derived from inferences from collection sites and habitat preferences in immediately adjacent states (particularly Indiana and Illinois). Natural communities are not listed for those species documented only from altered or ruderal habitats in Michigan, especially for taxa that occur in a variety of habitats outside of the state.

Natural communities are not listed in order of frequency of occurrence, but are rather derived from the full set of natural communities, organized by Ecological Group. In many cases, the general habitat descriptions should provide greater clarity and direction to the surveyor. In future versions of the Rare Species Explorer, we hope to incorporate natural community fidelity ranks for each taxon.

Feel free to send questions and comments to Brad Slaughter at slaugh14@msu.edu.

Associated Plants

Fire cherry, mountain ash, chokecherry, bracken fern, alder, serviceberry, thimbleberry, aspen, paper birch, ticklegrass, yarrow, bearberry, marsh bellflower, pale Indian paintbrush, hair grass, spike-rush, butterwort, ninebark, silverweed, dwarf Canadian primrose, and wild rose.

Management

Little is known of the biology and ecology of this species, though it likely benefits from disturbance that creates and maintains openings and colonization sites. This community occupies a stressed, potentially unstable environment; many of the species found in this community do not tolerate later stages of succession and require management that prevents woody plant encroachment. Protect from development.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Mar 24, 2017]

References

Survey References

Technical References