Slender aquatic forb of shallow lakes; stems submerged with delicate branches and foliage, the leaves small (4-12 mm), finely dissected and whorled on the stem; flowers and fruits borne in an emergent spike, the uppermost flowers in axils of alternate (not whorled) bracts.
Status and Rank
- State Status: SC
- State Rank: S2S3
- Global Rank: G5
|County Name||Number of Occurrences||Year Last Observed|
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.
Alternate-leaved water-milfoil is found in soft water lakes in Upper Michigan, in particular in the St Mary's River channel and bays of Isle Royale.
Natural Community Types
- Submergent marsh
- Emergent marsh
- Great lakes marsh
- Inland lake, littoral, benthic
- Great lake, littoral, benthic
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.
Quillwort, water lobelia, grass-leaved arrowhead, spiked water-milfoil, awlwort, chara (green alga), spatterdock), pondweed, and common bladderwort.
This species requires protection and maintenance of lake hydrology. It is likely also susceptible to pollution and other threats that modify and degrade water quality.
General Survey Guidelines
Random meander search covers areas that appear likely to have rare taxa, based on habitat and the judgment of the investigator.
- Meander search
Survey Period: From first week of July to fourth week of September
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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.