UW Burke Herbarium species comparison

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Clematis occidentalis

Clematis columbiana

Columbia clematis, rock clematis, Columbia virgins-bower
Habit Soft-hairy or sparsely woolly perennials with creeping or climbing, slender stems; plants scarcely viny in var. dissecta, found in the Wenatchee Mountains of Washington. Stems are viny, climbing, or trailing at 0.25-2.5 m long.
Leaves

Leaves opposite, ternate, firm but not succulent, the leaflets lance-ovate to triangular or sub-orbicular, lobed or unlobed, the margins entire or toothed.

Blade margins entire or less often crenate-serrate;

leaflets unlobed or occasionally 1 or 3 lobed, 2-11cm long.
Flowers

Flowers solitary, terminal on short axillary branches on naked peduncles 5-15 cm. long;

sepals usually 4, ovate-lanceolate to elliptic-oblong, acuminate, 3.5-6 cm. long, violet-blue to pale blue;

petals none;

stamens numerous, the outer ones often sterile;

styles 3-6 cm. long, plumose, persistent.

Sepals often wide-spreading, color varies from violet-blue to pale blue, rarely creamy white, lance-ovate and 3-6 cm long;

margins fluted, acuminate at tips.
Fruits

Achenes short-pubescent.

Clematis occidentalis

Clematis columbiana
Flowering time May-July
Habitat Often in deep, fine soils in shady forest, also in cliffs and other rocky sites in open woods and thickets, at moderate to high elevations in the mountains. Slopes and forest openings from foothills to moderate elevations in the mountains.
Distribution
Occurring east of the Cascades crest in Washington; British Columbia to Oregon, east to Saskatchewan and Wyoming.
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[BONAP county map]
East of the Cascades in Washington; Yukon Territory to Colorado.
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[BONAP county map]
Origin Native Native
Conservation status Not of concern Not of concern
Sibling taxa
C. hirsutissima, C. ligusticifolia, C. orientalis, C. vitalba
C. hirsutissima, C. ligusticifolia, C. occidentalis, C. orientalis, C. vitalba
Subordinate taxa
C. occidentalis var. dissecta, C. occidentalis var. grosseserrata
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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