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Montana Field Guide

Montana Field Guides

Arctic Pearlwort - Sagina nivalis

Species of Concern

Global Rank: G5
State Rank: S2S3
* (see State Rank Reason below)

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank: 3
C-value:

External Links






State Rank Reason (see State Rank above)
Rare in Montana, where it is known from Glacier National Park and the Beartooth Plateau. The remote, high-elevation habitat should greatly minimize the potential for any negative impacts to the viability of the species in the state. Accurate estimates of population levels are lacking.
 
General Description
Arctic Pearlwort is a small, cushion-forming perennial herb with numerous ascending to prostrate stems that are 1-5 cm long and arising from a basal rosette. The linear basal leaves are 5-15 mm long and have pointed tips. Pairs of opposite stem leaves are smaller and united around the stem at their bases. The foliage is glabrous and usually purplish tinged. Small, long-stalked, cup-shaped flowers arise from the axils of the uppermost 1-3 leaf pairs. The 4 purplish, separate sepals are 1-2 mm long, and the 4 white petals are usually slightly shorter. The fruit capsules are 2-3 mm long and expand beyond the appressed sepals.

Phenology
Flowering in late July-early August.

Diagnostic Characteristics
The more common Sagiona saginoides has 5 sepals that are white- or green- rather than purple-margined. Sagina procumbens does not form small mats. Stellaria and Cerastium have deeply bilobed petals. SPERGULARIA has clusters of secondary leaves in the leaf axils. A hand lens will be needed to distinguish diagnostic characters.

Species Range
Present
 


Range Comments
Circumpolar south to Glacier County, MT (Lesica 2012. Manual of Montana Vascular Plants. BRIT Press. Fort Worth, TX).

Summary of Observations Submitted for Montana
Number of Observations: 4

(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
Moist, shaded cliffs in the alpine zone.

Ecological Systems Associated with this Species

References
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Citation for data on this website:
Arctic Pearlwort — Sagina nivalis.  Montana Field Guide.  .  Retrieved on , from