Clematis orientalis

Linnaeus

Sp. Pl. 1: 543. 1753.

IllustratedIntroduced
Synonyms: Viticella orientalis (Linnaeus) W.A. Weber
Treatment appears in FNA Volume 3.

Stems climbing, 2-8 m. Leaf-blade pinnately 5-7-foliolate, proximal leaflets sometimes 3-foliolate; leaflets lanceolate to elliptic or ovate, usually 2-3-lobed proximally, 1-5.5 × 0.5-3.5 cm, margins entire or coarsely few-toothed; surfaces at least abaxially pubescent, glaucous. Inflorescences axillary, sometimes terminal, 3-many-flowered cymes or flowers solitary. Flowers bisexual; pedicel (0.5-) 1-11 cm; sepals widespreading and recurved, greenish yellow, ovatelanceolate to elliptic, 0.8-2 cm, length ca. 2.5 times width, margins densely pubescent, abaxially and adaxially pubescent or abaxially glabrous; stamens 20-40; filaments pilose proximally; staminodes absent; pistils 75-150. Achenes turgid, not conspicuously rimmed, pilose; beak 2-5 cm.


Phenology: Flowering summer–fall.
Habitat: Roadsides, other secondary habitats, open woods
Elevation: 0-2600 m

Distribution

V3 621-distribution-map.gif

Introduced; Ont., Colo., Nev., N.Mex., Utah, native to Eurasia

Discussion

Clematis orientalis has been reported from Idaho; it probably can be expected elsewhere.

This species has been divided by C. Grey-Wilson (1989) into five varieties, partly correlated with their distribution in Asia. Naturalized plants in North America seem best referred to C. orientalis var. robusta Grey-Wilson, native to Afghanistan.

Although Clematis orientalis has been naturalized in the Rocky Mountains since the late nineteenth century, it has spread especially rapidly since ca. 1975, becoming weedy and, in some localities, constituting a threat to young trees and native shrubby and herbaceous species.

Selected References

None.

Lower Taxa

None.

"thin" is not a number.

... more about "Clematis orientalis"
James S. Pringle +
Linnaeus +
cuneate +, truncate +  and cordate +
curved +  and straight +
plumose +
2 cm20 mm <br />0.02 m <br /> (5 cm50 mm <br />0.05 m <br />) +
scale-like;leaflike +
globose;cylindric +
3-many-flowered +
paired +  and solitary +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
Ont. +, Colo. +, Nev. +, N.Mex. +, Utah +  and native to Eurasia +
0-2600 m +
3-many-flowered +
paired +  and solitary +
nodding +  and not nodding +
showy +  and inconspicuous +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
sessile +  and aggregate +
flattened-ellipsoid;terete;flattened-ellipsoid;terete;lenticular +
Roadsides, other secondary habitats, open woods +
petiolate +, sessile +, compound +  and simple +
cordate +  and orbiculate oblong lanceolate or oblanceolate lobed or unlobed +
1 cm10 mm <br />0.01 m <br /> (5.5 cm55 mm <br />0.055 m <br />) +
2-3-lobed +, lanceolate +  and elliptic or ovate +
0.5 cm5 mm <br />0.005 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
palmate +  and pinnate +
glabrous +  and pubescent +
few-toothed;entire +
paired +  and solitary +
0 cm0 mm <br />0 m <br /> (15 cm150 mm <br />0.15 m <br />) +
0.5 cm5 mm <br />0.005 m <br /> (1 cm10 mm <br />0.01 m <br />) +
1 cm10 mm <br />0.01 m <br /> (11 cm110 mm <br />0.11 m <br />) +
distinct +
conspicuous +
reduced +
Flowering summer–fall. +
rudimentary +
75 +  and 150 +
not arillate +  and stalked +
not connivent +
greenish yellow +
not persistent +
distinct +
recurved +  and widespreading +
3 +  and 6 +
ovatelanceolate +  and elliptic +
0.8 cm8 mm <br />0.008 m <br /> (2 cm20 mm <br />0.02 m <br />) +
Illustrated +  and Introduced +
yellow-flowered +
200 cm2,000 mm <br />2 m <br /> (800 cm8,000 mm <br />8 m <br />) +
persistent +
glaucous;pubescent +
Viticella orientalis +
Clematis orientalis +
Clematis subg. Clematis +
species +
annual +  and perennial +