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common Dutchman's pipe, pipevine, woolly Dutchman's pipe

aristoloche clématite, asarabacca, birthwort, creeping birthwort

Habit Lianas, twining, to 25 m, woody. Herbs, erect, to 1 m. Young stem ribbed, glabrous to puberulent.
Young stem

ribbed, tomentose.

Leaves

blade ovate to reniform, 9-20 × 8-15 cm, base cordate, sinus depth 1-2 cm, apex obtuse to acute;

surfaces abaxially tomentose;

venation palmate-pinnate.

blade deltate to reniform, 4-6 × 5-6.5 cm, base cordate, sinus depth 1-2 cm, apex obtuse to rounded;

surfaces abaxially glabrous;

venation palmate.

Inflorescences

on new growth, axillary, solitary flowers;

peduncle not bracteolate, 1-7 cm.

on new growth, axillary, fascicles or solitary flowers;

peduncle not bracteolate, 1-4 cm.

Flowers

calyx yellow-green, sharply bent;

utricle pendent, globose to cylindric, 0.5-1 × 0.5-0.8 cm;

syrinx absent;

tube bent, cylindric, 1-3 × 0.5 cm;

annulus rugulose;

limb yellow, 3-lobed, lobes triangular, 2 × 2 cm, glabrous;

gynostemium 3-lobed, globose, 3 mm;

anthers 6;

ovary 6-locular, 1-7 cm.

calyx yellow-brown, curved;

utricle angled upward, ovoid to globose, 0.5 × 0.2-0.3 cm;

syrinx absent;

tube curved upward, cylindric, 1-3 × 0.2-0.3 cm;

annulus absent;

limb purple, 1-lobed, lobe funnel-shaped, 1-6 cm, pilose;

gynostemium 3-lobed, globose, 1-4 mm;

anthers 6;

ovary 6-locular, 1-4 cm.

Capsule

ellipsoid to cylindric, 6-8 × 4-6 cm, dehiscence basipetal;

valves 3;

septa entire, not attached to valves.

± globose, 3 × 2-3 cm, dehiscence basipetal;

valves 6;

septa entire, not attached to valves.

Seeds

flat, triangular, 1 × 1 cm.

flat, triangular, 1 × 1.2 cm.

2n

= 28.

Aristolochia tomentosa

Aristolochia clematitis

Phenology Flowering late spring–summer. Flowering summer.
Habitat Alluvial soils along rivers and streams Waste places, roadsides, ballast
Elevation 0–500 m (0–1600 ft) 0-100 m (0-300 ft)
Distribution
from FNA
AL; AR; FL; GA; IL; IN; KS; KY; LA; MO; MS; NC; OK; TN; TX
[WildflowerSearch map]
from FNA
MA; MD; NY; OH; PA; ON; QC; Europe [Introduced in North America]
[BONAP county map]
Discussion

Aristolochia tomentosa has escaped from cultivation in various places, including Virginia; this is not documented.

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

Aristolochia clematitis is occasionally cultivated, sometimes escapes, and probably does not persist.

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

Source FNA vol. 3. FNA vol. 3.
Parent taxa Aristolochiaceae > Aristolochia Aristolochiaceae > Aristolochia
Sibling taxa
A. californica, A. clematitis, A. coryi, A. erecta, A. macrophylla, A. maxima, A. pentandra, A. reticulata, A. serpentaria, A. watsonii, A. wrightii
A. californica, A. coryi, A. erecta, A. macrophylla, A. maxima, A. pentandra, A. reticulata, A. serpentaria, A. tomentosa, A. watsonii, A. wrightii
Synonyms Isotrema tomentosa
Name authority Sims: Bot. Mag. 33: plate 1369. (1811) Linnaeus: Sp. Pl. 2: 962. (1753)
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