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Montana Field Guide

Montana Field Guides

Spotted Water-meal - Wolffia brasiliensis
Other Names:  Wolffia punctata

Status Under Review
Native Species

Global Rank: G5
State Rank: S3
* (see State Rank Reason below)

Agency Status
MNPS Threat Rank:
C-value: 7

External Links

State Rank Reason (see State Rank above)
A species of limited distribution in Montana, but reported to be locally common in the Bitterroot and Mission Valleys.
  • Details on Status Ranking and Review
    Spotted Water-meal (Wolffia brasiliensis) Conservation Status Review
    Review Date =
General Description
Fronds elongate-globular, 0.5–1 mm long, green with minute brown spots (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range

Range Comments
Lake and Ravalli counties. Eastern and northwest U.S. to S. America (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 3

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density



(Observations spanning multiple months or years are excluded from time charts)

Fresh water of ponds and sloughs in the valley zone.

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Citation for data on this website:
Spotted Water-meal — Wolffia brasiliensis.  Montana Field Guide.  .  Retrieved on , from