Poonaikali is Mucuna pruriens, velvet bean — the climber whose ripe pods are covered in needles that itch like a bad idea, and whose seeds Hindi shops call kaunch. Sanskrit ātmaguptā (“self-hidden”) is a joke about those hairs. The seed is a traditional article and a modern L-DOPA conversation.
- Botanical name
- Mucuna pruriens (L.) DC.
- Family
- Fabaceae
- Tamil
- Poonaikali
- Hindi
- Kaunch
- Sanskrit
- Ātmaguptā
- Parts used
- Seeds, Sometimes root
- Habit
- Climbing annual or short-lived perennial; seed is the article, hairs are the hazard
- Last updated
- 2026-10-30
How to recognise Poonaikali
De Candolle published the combination. The family is Fabaceae. It is a vigorous climber with trifoliate leaves, dark hanging flowers, and pods densely clothed in orange-brown stinging hairs. The seed is large, ovoid, and varies from cream to mottled black.
The hairs (cowhage) are the field mark everyone remembers after one mistake. They are not the medicine. Handling dry pods without gloves is how people learn the Latin name.
Tamil poonaikali, Hindi kaunch / kewanch and Sanskrit ātmaguptā / kapikacchu are the names when the seller means this seed. English velvet bean and cowhage are the same species. Other Mucuna species exist; a “kaunch” powder is easy to fake.
Kew accepts the species. A vine on a fence after the rains and a seed in a vaithiyar’s tin can be the same plant if the mill is honest.
Seed that has been roasted, fermented or processed to reduce itch and to change chemistry is a different article from a raw bean. Labels should say which.
The variety that lacks stinging hairs in some farms is still this species if the botany matches. Hairless is a farm trait, not a second Latin name you can assume.
Traditional use of Poonaikali
Ayurveda
Kapikacchu / ātmaguptā seed is a rasāyana and vṛṣya heading in that system. Those are historical categories. They are not a modern claim about fertility or Parkinson’s disease.
Ayurvedic materia medica headings
Siddha and Tamil practice
Poonaikali is a known fence climber. Seed use belongs to people who know how to process the itch out. A raw internet bean is not that practice.
Tamil vernacular
Modern notes on Poonaikali
L-DOPA in the seed is a real alkaloid fact and the reason neurologists know the Latin name. A fact in a bean is not a reason to self-dose a movement disorder.
The practical modern issue is gym powders of unknown L-DOPA strength and pods sold to people who have never met the hairs.
Poonaikali safety
Do not handle dry pods with bare skin. The itch is mechanical and chemical and is not a joke.
Raw seed is not food. Processed seed in a traditional setting is still a concentrated object. People on psychiatric or Parkinson’s medicines, and people who are pregnant, should not start kaunch from a shop poster.
L-DOPA-containing products can interact with many drugs. That is a clinician conversation.
Ecology and sourcing
The climber is weedy in the right climate. Seed harvest does not require killing a forest. The hairs remain a handling problem in any lot.
Related plants
Also in Fabaceae
Questions about Poonaikali
Why does the pod itch?
The dry pod is covered in fine stinging hairs. They are a physical and chemical irritant. They are not the seed article.
What is the Tamil name of Mucuna pruriens?
Poonaikali.
Sources
- Mucuna pruriens (L.) DC. — Plants of the World Online, Kew (search) (accessed 2026)
- Wikidata item Q953611 (Mucuna pruriens)
Educational page about a plant. It is not medical advice, not a diagnosis, and not an offer to sell. Traditional use is historical. If you need care, ask a licensed clinician. Questions: hello@meevamed.com.