Asclepias ovalifolia
Dwarf milkweed
Image of Asclepias ovalifolia

Photo by Bradford S. Slaughter 

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Key Characteristics

Slender perennial forb (20-60 cm) of oak-pine barrens; leaves opposite on short petioles, usually limited to 4-6 pairs; flowers white to green, borne in clusters with long stalks.

Status and Rank

  • State Status: E
  • State Rank: S1
  • Global Rank: G5?

Occurrences

County NameNumber of OccurrencesYear Last Observed
Menominee42013
Distribution map for Asclepias ovalifolia

Updated 1/31/2017. 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

Long known from southern Menominee County, where it occurs in oak-pine barrens (oak-jack pine savanna). A disjunct population was discovered in a Lake County barrens in 2016.

Natural Community Types

Methodology

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.

Associated Plants

Black oak, white oak, jack pine, red maple, black cherry, pin oak, hickory, sassafras, service berry, New Jersey tea, sweetfern, beaked hazelnut, wintergreen, huckleberry, sand cherry, dwarf chinquapin oak, low sweet blueberry, little bluestem, big bluestem, sky-blue aster, false foxglove, tickseed, nut grass, flowering spurge, hair grass, tall sunflower, dwarf dandelion, blazing star, wild bergamot, goats-rue, wood betony, needle grass, and birdfoot violet.

Management

This species likely requires natural disturbances associated with prairie habitat such as prescribed fire or brush removal to prevent woody plant succession. Much of this habitat type has been lost or severely degraded.

General Survey Guidelines

Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.

Survey Methods

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed May 27, 2017]

References

Survey References

Technical References

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