Stems ± viny, climbing or trailing, 0.25-3.5 m. Leaves: leaflets unlobed or occasionally 1-3-lobed, (2-) 3-6 (-10) cm, margins entire or shallowly crenate-serrate. Flowers: sepals remaining moderately divergent, reddish violet, ovate to oblongelliptic, 2.5-6 cm, margins not fluted, tips rounded-mucronate to nearly acuminate. 2n = 16.

Phenology: Flowering spring.
Habitat: Calcareous cliffs, rock ledges, talus slopes, gravelly embankments, rocky woods, and clearings
Elevation: 0-1300 m

Distribution

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N.B., Ont., Que., Conn., Del., Ill., Iowa, Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Pa., R.I., Vt., Va., W.Va., Wis.

Discussion

Clematis occidentalis var. occidentalis formerly occurred in Ohio. Plants in the western part of the range of this variety tend to have larger, more abruptly tapering sepals; they have been segregated as var. grandiflora B.Boivin, but they do not appear to constitute a distinct taxon.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.