Glyceria acutiflora
Manna grass

Key Characteristics

Perennial grass of marshes; stem base lax and rooting at nodes; leaves also lax and slightly scabrous; inflorescence narrow, partially included in upper leaf sheath, branches of panicle ascending with sharp-pointed spikelets; paleas much longer than lemmas.

Status and Rank

  • State Status: X
  • State Rank: S1
  • Global Rank: G5

Occurrences

County NameNumber of OccurrencesYear Last Observed
Kalamazoo21947
Distribution map for Glyceria acutiflora

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

Data from collections is sparse, habitat is noted only as swamps and wet ground. The species was last confirmed in the state in 1947.

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

No data are available concerning associates in Michigan.

Management

Only two historical records exist in Michigan, and a status survey is recommended to determine if the species is extant in the state. If found, the species would likely require protection of hydrology.

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

Page Citation

Michigan Natural Features Inventory. 2007. Rare Species Explorer (Web Application). Available online at http://mnfi.anr.msu.edu/explorer [Accessed Jul 20, 2017]

References

Survey References

Technical References

Facebook link