Photo by Susan R. Crispin
Small orchid (10-20 cm) of moist, acid soils in the Upper Peninsula; plant with 2 opposite ovate leaves occurring halfway up the stem; flowers pale green, the lip with rounded lobes at the base, flower stalk covered tiny glandular hairs.
Status and Rank
- State Status: SC
- State Rank: S2S3
- Global Rank: G3G4
|County Name||Number of Occurrences||Year Last Observed|
Updated 5/15/2018. 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.
Auricled twayblade is found at the high flood line in moist alluvial sand under alders, along small stream drainages near the bare sand and on rocky ledges of the shoreline. Throughout its range this species has a strong preference for moist, acid, sandy to humic soils and a cool microclimate.
Natural Community Types
- Northern shrub thicket
- Floodplain forest
- Boreal forest
- Sand and gravel beach
- Volcanic bedrock lakeshore
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.
Tag alder, sweet fern, fowl manna grass, sedges (Carex intumescens, C. gracillima, C. gynocrates, C. crinita), sensitive fern, dwarf raspberry, swamp buttercup, horsetail, bugleweed, bracken fern, shinleaf, meadow-rue, virgin's bower, Canada mayflower, nodding trillium, red maple, swamp maple, and nannyberry.
Maintain intact habitat and protect hydrological regime.
General Survey Guidelines
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgement of the investigator.
- Meander search
Survey Period: From fourth week of June to first week of August
Survey Comments: Sandy streams with alder
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