| Arnica lonchophylla |
| Longleaf arnica |
Key Characteristics
Small perennial forb of Isle Royale; leaves lanceolate and hairy, becoming smaller and fewer toward the apex of the mostly leafless stem; flowers sunflower-like, 4-6 cm wide.
Status and Rank
- State Status: E - Endangered (legally protected)
- State Rank: S1 - Critically imperiled
- Global Rank: G4 - Apparently secure
Occurrences
| County Name | Number of Occurrences | Year Last Observed |
|---|---|---|
| Keweenaw | 1 | 1997 |
![Occurrence Map for [Sname]](/mnfi/maptmp/NFR_Distributions12590215824216.png)
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 calcareous basaltic lakeshore cliffs near Lake Superior on Isle Royale. Long known from northeastern Minnesota and adjacent Ontario, it was first discovered in Michigan in 1997.
Natural Community Types
Associated Plants
Management
The specific requirements of this species are unknown, but the primary need is likely conservation of its fragile cliff habitat and protection from trampling.
General Survey Guidelines
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.
Survey Methods
References
Survey References
- Elzinga, C.L., D.W. Salzer, and J.W. Willoughby. 1998. Measuring and Monitoring Plant Populations. The Nature Conservancy and Bureau of Land Management, Denver. BLM Technical Reference 1730-1. 477pp.
- Goff, G.F., G.A. Dawson, and J.J. Rochow. 1982. Site examination for Threatened and Endangered plant species. Environmental Management 6(4): 307-316
- Nelson, J.R. 1984. Rare Plant Field Survey Guidelines. In: J.P. Smith and R. York. Inventory of rare and endangered vascular plants of California. 3rd Ed. California Native Plant Society, Berkeley. 174pp.
- Nelson, J.R. 1986. Rare Plant Surveys: Techniques For Impact Assessment. Natural Areas Journal 5(3):18-30.
- Nelson, J.R. 1987. Rare Plant Surveys: Techniques for Impact Assessment. In: Conservation and management of rare and endangered plants. Ed. T.S. Elias. California Native Plant Society, Sacramento. 8pp.
Technical References
- Antonio, T.M. and S. Masi. 2001.The Sunflower Family in the Upper Midwest. A Photographic Guide to the Asteraceae in Illinois, Indianan, Iowa, Michigan, Minnesota and Wisconsin. Indiana Academy of Science, Indianapolis. 421pp.
- Flora of North America Editorial Committee. 2006. Flora of North America, North of Mexico. Volume 21: Magnoliophyta: Asteridae (in part): Asteraceae, part 3. Oxford University Press, New York. 616pp.
- Gleason, H. A., and A. Cronquist. 1991. Manual of Vascular Plants of Northeastern United States and Adjacent Canada. Second edition. The New York Botanical Garden, Bronx. 910pp.
- 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.
- Voss, E.G. 1996. Michigan Flora. Part III. Dicots (Pyrolaceae-Compositae). Bulletin of the Cranbrook Institute of Science and University of Michigan Herbarium. 622pp.