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Montana Field Guide

Montana Field Guides

Pointed Broom Sedge - Carex scoparia

Species of Concern

Global Rank: G5
State Rank: S1S2
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 7

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is currently known from only a few sites in the Clark Fork and Bitterroot River drainages.
 
General Description
Pointed Broom Sedge forms dense clumps without rhizomes and has stems 4-10 dm high. The lowermost leaves are reduced to scales. The leaf blades, which are 1-3 mm wide, are flat and clustered just above the scales on the lower stem. Flowers are clustered in 3-8 egg-shaped, stalkless spikes, which are 8-14 mm long and in close proximity to each other at the top of the stem. Male flowers (recognized by the old stamens) occur at the base of each spike. The pale green to light brown egg-shaped perigynia are 4-6 mm long and taper gradually to a poorly-defined beak. The firm scales are light brown with a green center and are smaller than the perigynia that they subtend. There are 2 styles and the achenes are lens-shaped.

Phenology
Fruiting in August.

Diagnostic Characteristics
There are many sedges similar to C. scoparia. The common C. bebbii has perigynia that are less than 4 mm long. A technical manual and hand lens or microscope will be needed for positive identification.

Species Range
Present
 


Range Comments
BC to NL south to CA, ID, MT, KS, MS and GA (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 12

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

Recency

 

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



Habitat
Wet soil along rivers and sloughs in the valleys.

References
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Citation for data on this website:
Pointed Broom Sedge — Carex scoparia.  Montana Field Guide.  .  Retrieved on , from