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Kamchatica Rockcress - Arabidopsis lyrata ssp. kamchatica
Other Names:
Arabis lyrata
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State Rank Reason (see State Rank above)
Known from one 1952 collection near Mount Brown in Glacier National Park.
General Description
Lyre-leaf Rockcress is a short-lived perennial with 1 to several simple or branched stems, which are 1-3 dm high and arise from a simple or branched rootcrown. The mostly basal leaves, which are 1-6 cm long, have lobed, broadly lance-shaped blades narrowed to a petiole of equal length. The alternate stem leaves are sessile and few-lobed. Foliage is sparsely covered with long, stiff hairs. 3-20 erect, stalked flowers are borne in a compact inflorescence that expands as the fruits mature. Each flower has 4 glabrous sepals which are ca. 3 mm long, 4 white petals which are 5-8 mm long, 4 long stamens, and 2 short stamens. The glabrous, slightly compressed, linear capsules (siliques) are 2-4 cm long, ca. 1 mm wide, and are held erect.
Phenology
Flowering and possibly fruiting in May.
Diagnostic Characteristics
The deeply lobed leaves separate this species from all other ARABIS in our area. Species of HALIMOLOBOS are also similar but have either clasping stem leaves or hairy siliques.
Observations in Montana Natural Heritage Program Database
Number of Observations: 1
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Relative Density
Recency
(Observations spanning multiple months or years are excluded from time charts)
Habitat
Along rivers and lakes in damp woods of montane and possibly subalpine zones.
Threats or Limiting Factors
STATE THREAT SCORE REASON
References
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