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Long Yam

Dioscorea transversa

Also called Common Yam Vine, Marou, Pencil Yam

Long Yam
Photo: Mark Marathon, CC BY-SA 4.0

Dioscorea transversa, called pencil yam or long yam, is a climbing vine native to eastern and northern Australia. Its long, slender tubers are the edible part, and they are cooked before eating.

Family
Dioscoreaceae (Dioscore family)
Grows as
Climber, Bulb
Light
Part shade, Bright indirect
Water
Water regularly during the growing season and reduce watering as the vine dies back in the dry season.
Soil
Deep, loose, well-drained soil, ideally sandy loam, to allow long tubers to develop.
Temperature
18–32 °C; protect below 10 °C
How easy
Moderate
Edible
Yes, some parts
Native range
N. & E. Australia
Climate
seasonally dry tropical

About

Dioscorea transversa, the pencil yam, is a vine of eastern and northern Australia.

The leaves are heart-shaped, shiny, with 5-7 prominent veins. The seed pods are rounded, green or pink before drying to a straw brown papery texture. The edible tubers are typically slender and long. There are two forms: an eastern rainforest and wet sclerophyll form which doesn't have bulbils, and a northern form which occurs in open forests and has small bulbils and large inground tubers.

Uses

The tubers were a staple food of Australian Aboriginals and are eaten after cooking, usually in ground ovens. The 1889 book 'The Useful Native Plants of Australia records that common names included "long yam", Indigenous Australians from Central Queensland referred to it as "kowar" and that "the small young tubers are eaten by the aborigines without any preparation."

Other Dioscorea plants

Dioscorea abyssinica · Water yam · Air yam · Yellow guinea yam · Black Bryony · Yam · Elephant's Foot · Wild Yam · Elephant's Foot Yam · Lesser yam · Yam · Dioscorea fordii

Text excerpted from the Wikipedia article Dioscorea transversa by its contributors, under CC BY-SA 4.0; the excerpts and the care summary drawn from them are shared under the same licence.

The care summary was written by AI (Claude, Anthropic) from the sources on this page, with general growing knowledge where they are silent. Check before relying on it.

Life form, climate and native range: World Checklist of Vascular Plants, Royal Botanic Gardens, Kew (CC BY 3.0), reformatted; see Plants of the World Online.

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