Plants and Animals
Lonicera involucrata Black twinberry
Erect shrub of Isle Royale; opposite leaves oval with a sharp-pointed tip; yellow, funnel shaped flowers borne in pairs on long stalks from the leaf axils, enveloped by 2 pairs of leaf-like bracts, which expand and enclose the purple-black berries when fruiting.
Status and Rank
US Status: No Status/Not Listed
State Status: T - Threatened (legally protected)
Global Rank: G5T4T5
State Rank: S2 - Imperiled
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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.
Black twinberry is found in cool woodland habitats, including swampy woods and thickets, bogs, streambanks, and shores.
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.
White cedar, white spruce, balsam fir, trembling aspen, paper birch, red-osier dogwood, tag alder, big leaf aster, fringed polygala, wild sarsaparilla, twinflower, and goldthread.
Maintain intact habitat as well as hydrological regime. Likely sensitive to heavy logging and excessive canopy removal.
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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- Voss, E.G. 1996. Michigan Flora. Part III. Dicots (Pyrolaceae-Compositae). Bulletin of the Cranbrook Institute of Science and University of Michigan Herbarium. 622pp.