Clematis occidentalis

(Hornemann) de Candolle

Prodr. 1: 10. 1824.

Common names: Purple clematis clématite occidentale
Endemic
Basionym: Atragene occidentalis Hornemann Hort. Bot. Hafn. 2: 520. 1815
Treatment appears in FNA Volume 3.

Stems viny, climbing or trailing (plants scarcely viny perennials in var. dissecta). Leaf blade 1-ternate (or terminal leaflet sometimes ternate in var. dissecta), ± firm but not succulent; leaflets lance-ovate to triangular or suborbiculate, lobed or unlobed, margins entire or toothed. Flowers: sepals violet-blue, reddish violet, or white, lanceolate to ovate or elliptic-oblong.

Distribution

Alta., B.C., N.B., Ont., Que., Sask., Yukon, Colo., Conn., Del., Idaho, Ill., Iowa, Maine, Mass., Md., Mich., Minn., Mont., N.C., N.H., N.J., N.Y., Oreg., Pa., R.I., Utah, Va., Vt., W.Va., Wash., Wis., Wyo.

Discussion

Varieties 3 (3 in the flora).

Selected References

None.

Key

1 Leaflets lobed or unlobed, margins entire or crenate-serrate (or terminal leaflet sometimes ternate); stems tufted or, if viny, up to 0.5(–1.5) m. Clematis occidentalis var. dissecta
1 Leaflets unlobed or some 1–3-lobed, margins entire or shallowly serrate; stems ± viny, climbing or trailing, 0.25–3.5 m. > 2
2 Sepals reddish violet, rounded-mucronate to nearly acuminate. Clematis occidentalis var. occidentalis
2 Sepals violet-blue to pale blue, rarely white, usually distinctly acuminate. Clematis occidentalis var. grosseserrata
... more about "Clematis occidentalis"
James S. Pringle +
(Hornemann) de Candolle +
Atragene occidentalis +
Purple clematis +  and clématite occidentale +
Alta. +, B.C. +, N.B. +, Ont. +, Que. +, Sask. +, Yukon +, Colo. +, Conn. +, Del. +, Idaho +, Ill. +, Iowa +, Maine +, Mass. +, Md. +, Mich. +, Minn. +, Mont. +, N.C. +, N.H. +, N.J. +, N.Y. +, Oreg. +, Pa. +, R.I. +, Utah +, Va. +, Vt. +, W.Va. +, Wash. +, Wis. +  and Wyo. +
Clematis occidentalis +
Clematis subg. Atragene +
species +