Dutchman's Pipe, Woolly dutchman's pipe

Aristolochia tomentosa

Physical Characteristics

Aristolochia tomentosa is a PERENNIAL growing to 10 m (32ft) by 1 m (3ft 3in) at a fast rate. See above for USDA hardiness. It is hardy to UK zone 8. It is in flower from July to August. The species is hermaphrodite (has both male and female organs) and is pollinated by Flies. Suitable for: light (sandy), medium (loamy) and heavy (clay) soils and prefers well-drained soil. Suitable pH: mildly acid, neutral and basic (mildly alkaline) soils and can grow in very alkaline soils. It can grow in semi-shade (light woodland) or no shade. It prefers dry or moist soil.

Distribution

South-eastern N. America - North Carolina too Florida, west to Texas, Kansas and Illinois.

Habitats

Woodland Garden Dappled Shade;

Edible Uses

None known

Medicinal Uses

Antidote Bitter Diaphoretic Expectorant Febrifuge Odontalgic Stimulant Tonic This species has medicinal activity that is similar to but weaker than A. serpentaria[222]. - these activities are listed below[K]. The Virginia snakeroot is attracting increasing interest for its medicinal virtues and as a result is becoming uncommon in the wild. It merits consideration for cultivation in forest areas[222]. It is used in a number of proprietary medicines for treating skin, circulatory and kidney disorders[238]. The plant contains aristolochic acid which, whilst stimulating white blood cell activity and speeding the healing of wounds, is also carcinogenic and damaging to the kidneys[254]. The root is harvested in the autumn and dried for later use[238]. The root is antidote, anti-inflammatory, bitter tonic, diaphoretic, diuretic and stimulant[1, 2, 4, 21, 46, 200]. Traditionally it was chewed in minute doses or used as a weak tea to promote sweating, stimulate the appetite and promote expectoration[4, 222]. The native North Americans considered it to have analgesic properties and used an infusion internally to treat rheumatism, pain - but especially sharp pains in the breast, and as a wash for headaches[257]. This plant should be used with caution, it is irritating in large doses and can cause nausea, griping pains in the bowels etc[4, 21, 222]. It should only be used internally under the supervision of a qualified practitioner[238]. The bruised root is placed in hollow teeth for treating toothache[207]. An extract of the root can be drunk to relieve stomach pains[207]. The boiled root, or a decoction of the whole plant, can be used to treat fevers[213]. The chewed root or crushed leaves was applied to snakebites[207, 213]. This species was the most popular snakebite remedy in N. America[213]. It has also been applied externally to slow-healing wounds and in the treatment of pleurisy[238].

Known Hazards

We have no specific details for this species but most members of this genus have poisonous roots and stems[179]. The plant contains aristolochic acid, this has received rather mixed reports on its toxicity. According to one report aristolochic acid stimulates white blood cell activity and speeds the healing of wounds, but is also carcinogenic and damaging to the kidneys[254]. Another report says that it is an active antitumour agent but is too toxic for clinical use[218]. Another report says that aristolochic acid has anti-cancer properties and can be used in conjunction with chemotherapy and radiotherapy and that it also increases the cellular immunity and phagocytosis function of the phagocytic cells[176].