Overview

Distribution

National Distribution

Canada

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

United States

Origin: Unknown/Undetermined

Regularity: Regularly occurring

Currently: Unknown/Undetermined

Confidence: Confident

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Global Range: Widespread cordilleran sp. mid-west location at St. Louis Co., MN, and 1 questionable site in Florence Co., WI (Nicolet NF) that is possibly introduced.

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Physical Description

Type Information

Isolectotype for Polemonium occidentale Greene
Catalog Number: US 412018
Collection: Smithsonian Institution, National Museum of Natural History, Department of Botany
Verification Degree: Verified from the card file of type specimens
Preparation: Pressed specimen
Collector(s): C. F. Baker
Year Collected: 1901
Locality: Alt. 7680 ft., Gunnison, Colorado, United States, North America
Elevation (m): 2341 to 2341
  • Isolectotype: Greene, E. L. 1890. Pittonia. 2: 75.
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Ecology

Habitat

Comments: Very wet places (arbor-vitae swamps in the midwest) at mid- elevations in mountains.

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Conservation

Conservation Status

National NatureServe Conservation Status

Canada

Rounded National Status Rank: NNR - Unranked

United States

Rounded National Status Rank: NNR - Unranked

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NatureServe Conservation Status

Rounded Global Status Rank: G5 - Secure

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Wikipedia

Polemonium occidentale

Polemonium occidentale is a species of flowering plant in the phlox family known by the common name western Jacob's-ladder. There are two subspecies.[1] The common ssp. occidentale is native to western North America from British Columbia to Colorado to California, where it can be found in moist areas of many habitat types, including meadows and woodlands. There is also a rare subspecies, ssp. lacustre, which is known only from a total of three counties in Minnesota and Wisconsin, and is found only in white cedar swamp habitat there.[1]

This is a rhizomatous perennial herb producing an erect stem up to one meter tall. The leaves are located along the stem, each divided into many small lance-shaped leaflets. The inflorescence is an open, elongated array of several bell-shaped, five-lobed flowers each up to 1.5 centimeters long. The flower corolla is blue to bright purple with a white throat.

The rare ssp. lacustre faces threats including peat mining in its swamp habitat, herbivory by deer, and alterations in the local hydrology where it grows.[1] There are only five populations of this subspecies.[2]

References[edit]

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