Chamaerhodos nuttallii var. keweenawensis
Rock-rose
Image of Chamaerhodos nuttallii var. keweenawensis

Photo by Susan R. Crispin 

More Images

Key Characteristics

Small perennial (10-30 cm) limited to rocky summits in Keweenaw County; leaves pinnately divided into linear segments; flowers white with 5 petals.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G5T1Q

Occurrences

County NameNumber of OccurrencesYear Last Observed
Keweenaw12014
Distribution map for Chamaerhodos nuttallii var. keweenawensis

Updated 7/21/2017. 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

The sole population in the state grows on an exposed, eroding, windswept summit of a sparsely vegetated south-facing conglomerate cliff.

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.

Associated Plants

Poverty grass, Canada bluegrass, goldenrod (Solidago spathulata), silvery cinquefoil, common polypody, smooth cliff brake, and bush honeysuckle.

Management

Michigan's only population is vulnerable to trampling. The species requires maintenance of cliff and natural disturbance processes, protect from potential artificial disturbance due to rock climbing and foot traffic. It is also likely susceptible to invasive species. This tiny rosette-forming plant is easily overlooked and may occur elsewhere in the western Upper Peninsula.

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 Oct 19, 2017]

References

Survey References

Technical References

Facebook link