Plants and Animals
Chamaerhodos nuttallii var. keweenawensis Rock-rose
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 - Endangered (legally protected)
Global Rank: G5T1Q
State Rank: S1 - Critically imperiled
|County||Number of Occurrences||Year Last Observed|
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.
The sole population in the state grows on an exposed, eroding, windswept summit of a sparsely vegetated south-facing conglomerate cliff.
Natural Community Types
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.
Poverty grass, Canada bluegrass, goldenrod (Solidago spathulata), silvery cinquefoil, common polypody, smooth cliff brake, and bush honeysuckle.
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.
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.
Survey Period: From fourth week of May to fourth week of June
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- Gray, A. 1950. Gray's Manual of Botany; eighth ed. Van Nostrand Reinghold, New York. 1632pp.
- Holmgren, N.H. 1998. Illustrated Companion to Gleason and Cronquist's Manual. Illustrations of the vascular plants of Northeastern United States and adjacent Canada. New York Botanical Garden, Bronx. 937pp.
- Scoggan, H.J. 1978. The Flora of Canada. National Museum of Natural Science Publications Botany 4: 1711pp.
- Voss, E. G. 1985. Michigan Flora. Part II. Dicots (Saururaceae-Cornaceae). Bulletin of the Cranbrook Institute of Science and University of Michigan Herbarium. 724pp.