Plants and Animals
Draba arabisans Rock whitlow grass
Small forb (10-40 cm) of rocky shores in the Upper Peninsula; basal rosette of oblong leaves, covered with stellate hairs; stem leaves sparse (3-10); flowers white with four petals; fruits elongated, flattened, glabrous, and twisting when mature.
Status and Rank
US Status: No Status/Not Listed
State Status: SC - Special Concern (rare or uncertain; not legally protected)
Global Rank: G4G5 - Rank is uncertain, ranging from apparently secure to secure
State Rank: S3 - Vulnerable
|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.
Found on cliffs, boulders, and cobble near the Great Lakes shores in the Upper Peninsula.
Natural Community Types
- Granite cliff
- Limestone bedrock glade
- Limestone bedrock lakeshore
- Limestone cliff
- Limestone cobble shore
- Limestone lakeshore cliff
- Northern bald
- Volcanic bedrock lakeshore
- Volcanic cliff
- Volcanic cobble shore
- Volcanic lakeshore cliff
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.
Creeping juniper, rock-cress, wormwood, hair-grass, cinquefoil, bearberry, poverty oat-grass, common polypody, smooth cliff brake, and bush honeysuckle.
Requires maintenance of cliff and natural disturbance processes. Protect from trampling due to intensive recreational activities such as rock climbing. This species is also susceptible to invasive species.
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.
Survey Period: From first week of June to fourth week of August
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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.