Flora of North America species comparison

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Clematis drummondii

Clematis vitalba

Barbas de chivato, Drummond's clematis, old man's beard

evergreen clematis, old-man's beard, Traveler's-joy, Traveler's-joy clematis, white virgin's-bower
Stems

scrambling to climbing with tendril-like petioles and leaf-rachises, 4-5 m or more.

climbing with tendril-like petioles and leaf-rachises, to 12 m. Leaf blade pinnately 5-foliolate;

leaflets cordiform, 8 × (2-)3-5(-6) cm, margins entire to regularly crenate or dentate;

surfaces abaxially minutely pubescent on veins, adaxially glabrous.
Leaf

blade odd-pinnate, usually 5-foliolate;

leaflets deltate to ovate, strongly 3-parted to 3-cleft, proximal leaflets sometimes 3-cleft, 1.5-5.5 × 0.5-4.5 cm, membranous to leathery;

segments ovate, deltate, or linear, margins dentate;

surfaces pilose, abaxially more densely so.

Inflorescences

usually axillary, 3-12-flowered simple cymes or compound with central axis or flowers solitary or paired.

axillary and terminal, (3-)5-22-flowered cymes.
Flowers

unisexual;

pedicel slender, (1.1-)1.5-7 cm;

sepals wide-spreading, not recurved, white to cream, oblong or elliptic to obovate or oblanceolate, (7-)9-13(-15) mm, abaxially and adaxially pubescent;

stamens 40-90;

filments glabrous;

staminodes 17-35 when present;

pistils 35-90.

bisexual;

pedicel 1-1.5 cm, slender;

sepals wide-spreading, not recurved, white to cream, elliptic or oblanceolate to obovate, ca. 1 cm, length ca. 2 times width, abaxially and adaxially tomentose;

stamens ca. 50;

filaments glabrous;

staminodes absent;

pistils 20 or more.
Achenes

elliptic to ovate, 3-5 × l.5-2.5 mm, rimmed, short-silky;

beak 4-9 cm.

nearly terete, not conspicuously rimmed, densely pubescent;

beak ca. 3.5 cm.

Clematis drummondii

Clematis vitalba
Phenology Flowering spring–fall (Mar–Oct). Flowering summer (Jun–Aug).
Habitat Chaparral, xeric scrub, oak scrub, and grasslands, pastures, fencerows, and other secondary sites, often along streams or on slopes Roadsides, waste ground, secondary growth
Elevation 0-2200 m (0-7200 ft) 0-100 m (0-300 ft)
Distribution
from FNA
AZ; CA; CO; NM; OK; TX; n Mexico
[WildflowerSearch map]
[BONAP county map]
from FNA
ME; OR; WA; BC; ON; native to Europe; n Africa [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Discussion

As with many other members of the subgenus, the leaves of Clematis drummondii are reputedly used in a poultice to treat irritations of the skin in humans and other animals.

Clematis coahuilensis D. J. Keil is found in central and north-central Mexico in habitats similar to those of C. drummondii; it is distinguished by ovate, entire to 3-lobed, leathery leaflets.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Clematis vitalba is naturalized in only a few sites in eastern North America and northwestern Oregon to the Puget Sound.

(Discussion copyrighted by Flora of North America; reprinted with permission.)
Source FNA vol. 3. FNA vol. 3.
Parent taxa Ranunculaceae > Clematis > subg. Clematis Ranunculaceae > Clematis > subg. Clematis
Sibling taxa
C. addisonii, C. albicoma, C. baldwinii, C. bigelovii, C. catesbyana, C. coactilis, C. columbiana, C. crispa, C. fremontii, C. glaucophylla, C. hirsutissima, C. lasiantha, C. ligusticifolia, C. morefieldii, C. occidentalis, C. ochroleuca, C. orientalis, C. pauciflora, C. pitcheri, C. recta, C. reticulata, C. socialis, C. tangutica, C. terniflora, C. texensis, C. versicolor, C. viorna, C. virginiana, C. vitalba, C. viticaulis, C. viticella
C. addisonii, C. albicoma, C. baldwinii, C. bigelovii, C. catesbyana, C. coactilis, C. columbiana, C. crispa, C. drummondii, C. fremontii, C. glaucophylla, C. hirsutissima, C. lasiantha, C. ligusticifolia, C. morefieldii, C. occidentalis, C. ochroleuca, C. orientalis, C. pauciflora, C. pitcheri, C. recta, C. reticulata, C. socialis, C. tangutica, C. terniflora, C. texensis, C. versicolor, C. viorna, C. virginiana, C. viticaulis, C. viticella
Synonyms C. nervata
Name authority Torrey & A. Gray: Fl. N. Amer. 1: 7. (1838) Linnaeus: Sp. Pl. 1: 544. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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