Aristolochia serpentaria
Aristolochia tomentosa
Virginia snakeroot
common Dutchman's pipe, pipevine, woolly Dutchman's pipe
ribbed, tomentose.
blade lanceolate to ovate, 5-15 × 1-5 cm, base truncate to cordate, sinus depth 0-1.5 cm, apex acute to acuminate;
surfaces abaxially glabrous or hispid;
venation pinnate.
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.
from base of stem, an additional flower in axil of stem leaf, racemes;
peduncle bracteolate, to 1.5 cm;
bracteoles lanceolate, to 3 mm.
on new growth, axillary, solitary flowers;
peduncle not bracteolate, 1-7 cm.
calyx brown-purple, bent;
utricle pendent, pear-shaped to ovoid, 0.5-5 cm;
syrinx present, ringlike, 1 mm, oblique;
tube bent, cylindric, 1 cm;
annulus smooth;
limb purplish brown, 3-lobed, lobes 0.5 × 0.5 cm, glabrous;
gynostemium 3-lobed, globose to crown-shaped, 1.5 mm;
anthers 6;
ovary 3-locular, to 1.5 cm.
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.
globose, 0.8-2 × 1-2 cm, dehiscence basipetal;
valves 6;
septa absent.
ellipsoid to cylindric, 6-8 × 4-6 cm, dehiscence basipetal;
valves 3;
septa entire, not attached to valves.
rounded, ovate, 0.5 × 0.4 cm.
flat, triangular, 1 × 1 cm.
= 28.
= 28.
Aristolochia serpentaria
Aristolochia tomentosa
Inflorescences of Aristolochia serpentaria often bear closed flowers that appear to be cleistogamous. Leaf shape varies greatly between populations, especially with regard to leaf width and size of basal lobes. This variability is especially interesting because eastern pipe-vine swallowtail butterflies, Battus philenor philenor (Linnaeus), use leaf shape as a search image when looking for Aristolochia leaves on which to lay their eggs.
The dried rhizome, called Virginia snakeroot or serpentary, is a popular herbal tonic. In small doses, it is a gastric stimulant and diuretic. Large doses can cause violent gastric distress and respiratory paralysis (J. A. Duke 1985). The rhizome contains aristolochic acid and trimethyl amine, both potential carcinogens.
Several Native American tribes used Aristolochia serpentaria for diverse medicinal purposes, including treatment of rheumatism, various pains, obstructions, worms, toothaches, sore throats, fever, sore noses, and colds, as a tonic, and mixed with saliva for snake bites (D. E. Moerman 1986).
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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.)
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