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Montana Field Guide

Montana Field Guides

Anderson's Swordfern - Polystichum andersonii
Other Names:  Anderson's Hollyfern


Global Rank: G4
State Rank: S3S4
* (see State Rank Reason below)

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

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State Rank Reason (see State Rank above)
Polystichum andersonii occurs where vegetation is dense, such as moist spruce-fir forests, avalanche chutes, along streams, and shrub thickets. It is documented from about 17 locations in western Montana, but known from several more locations in the Cabinet and Bitterroot Mountains. Though its habitat may be limited in Montana, populations are present and appear stable. It can grow as a sterile hybrid that develops large colonies through vegetative propagation by its bulblets.
 
General Description
Leaves arching, 20–70 cm long, commonly with 1 to several scaly, bulblets on central axis among upper pinnae. Leaf blade narrowly elliptic or lanceolate. Pinnae narrowly lanceolate, the lower deeply divided, 2–10 cm long with sharp-pointed lobes. Indusium with sparse marginal hairs (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Species Range
Present
 


Range Comments
In MT known only from Lincoln, Flathead and Ravalli counties; AK south to OR and MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 19

(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

References
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Citation for data on this website:
Anderson's Swordfern — Polystichum andersonii.  Montana Field Guide.  .  Retrieved on , from