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Montana Field Guide

Montana Field Guides

Spiny-spore Quillwort - Isoetes echinospora
Other Names:  Isoetes tenella

Species of Concern
Native Species

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

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 9

External Links






State Rank Reason (see State Rank above)
Isoetes echinospora is known from 8 occurrences scattered in western Montana. At one occurrence, the species has been observed in 1940, 1967, and 1998 indicating persistence. However, current survey work is needed to document locations, population sizes, and threats.
 
General Description
Plants aquatic. Leaves 6–15 cm long with a blunt tip. Sporangia 3–6 mm long. Megaspores 0.4–0.6 mm wide (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Range Comments
In MT in Flathead, Lake, Missoula and Ravalli counties; Circumboreal, south to CA, UT, CO, OH, NJ (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Observations in Montana Natural Heritage Program Database
Number of Observations: 10

(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
Unconsolidated mud in shallow water of lakes and sloughs; valleys to lower subalpine (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

References
  • Literature Cited AboveLegend:   View Online Publication
    • Lesica, P., M. T. Lavin, and P. F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
  • Web Search Engines for Articles on "Spiny-spore Quillwort"
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Citation for data on this website:
Spiny-spore Quillwort — Isoetes echinospora.  Montana Field Guide.  .  Retrieved on , from