Clematis crispa L.

Swamp Leather Flower


CC = 8
CW = -3
MOC = 8

© SRTurner

Family - Ranunculaceae

Habit - Twining, perennial forb.

Stem - Twining through other vegetation, to 3 m. Nodes with a thickened collar of tissue joining opposite petioles.

Clematis_crispa_stem.jpg Stem.

© SRTurner

Leaves - Opposite, pinnately 5-7 compound or bipinnate, petiolate, herbaceous in texture. Leaflets usually undivided but sometimes lobed, otherwise entire, glabrous, the upper surface green, the undersurface paler but not glaucous.

Clematis_crispa_leaf.jpg Leaf.

© SRTurner

Clematis_crispa_leaflet1.jpg Leaflet adaxial.

© SRTurner

Clematis_crispa_leaflet2.jpg Leaflet abaxial.

© SRTurner

Clematis_crispa_leaflet2a.jpg Leaflet abaxial surface.

© SRTurner

Flowers - Solitary, urn-shaped, nodding. Sepals 4, petalloid, 3-4 cm long with strongly reflexed tips, leathery, pinkish to bluish-purple, with 3-5 mm wide crisped margins, externally pubescent, internally glabrous. Petals absent. Stamens and pistils numerous.

Clematis_crispa_flower.jpg Flower.

© SRTurner


© SRTurner

Clematis_crispa_flower2.jpg Flower, ventral view.

© SRTurner

Clematis_crispa_carpels.jpg Pistils.

© SRTurner

Fruits - In clusters, with achene beaks ascending to spreading. Achenes with beaks 2.0-3.5 cm long.

Clematis_crispa_fruits.jpg Fruits.

© SRTurner

Flowering - April - August.

Habitat - Bottomland and mesic forests, swamps, wet ditches.

Origin - Native to the U.S.

Lookalikes - Clematis pitcheri, C. viorna, C. versicolor.

Other info. - This attractive species is uncommon in Missouri, recorded mostly from a handful of counties in and near the Bootheel. Missouri lies at the northwestern extent of its range, which extends easward and southward to the coast in both directions. Since the plant twines and sprawls through other vegetation, it is usually inconspicuous except when in flower. It is easily identified by the shape of the flower and the presence of the characteristic wide, crisped margins of the sepals.

Several of the photos above were taken in wet roadside ditches. In the southeastern part of the state, these can be great sources of wetland plant species which are unusual elsewhere in the state.

Photographs taken near Neelyville, Butler County, MO, 5-21-2014, and at Duck Creek Conservation Area, Wayne County, MO, 5-13-2016 and 6-15-2023 (SRTurner).