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Montana Field Guide

Montana Field Guides

Dwarf Bulrush - Lipocarpha micrantha
Other Names:  Hemicarpha micrantha

Potential Species of Concern
Native Species

Global Rank: G5
State Rank: SH
(see State Rank Reason below)

Agency Status


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State Rank Reason (see State Rank above)
Known in Montana from a 1941 Collection by W. E. Booth near Fromberg.
General Description
Tufted, grass-like annual with fibrous roots and slender stems that are up to 10 cm tall. The few, narrow leaves are borne near the base. Flowers are borne in 1-3 egg-shaped, pine cone-like sessile inflorescences, or spikes, that are subtended by 2-3 green, leaf-like bracts. One bract is held nearly erect and appears to be a continuation of the stem. Each spike is composed of numerous, spirally arranged, pointed scales. Each of these outer scales subtends a smaller, membranous inner scale, an ovary, and a single stamen. The fruit is a flattened, egg-shaped achene that is smaller than the inner scale.

Flowering in August.

Diagnostic Characteristics
Previous reports of hemicarpha drummondii for Montana are based on this species.

Species Range
Montana Range Range Descriptions


Range Comments
BC to QC south to CA, AZ, NM, TX, AL, FL. Collected in Carbon County (Lesica et al. 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 1

(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)

Reported elsewhere on moist, sandy soil along rivers and streams in the valleys.

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Citation for data on this website:
Dwarf Bulrush — Lipocarpha micrantha.  Montana Field Guide.  .  Retrieved on , from