Yam (vegetable)

Names and Synonyms

Common Names

• Yam (vegetable)
• Asiatic bitter yam
• intoxicating yam
• Indian Three-leaved Yam

Scientific Names

Accepted name

Synonyms

• Helmia daemona
• Helmia hirsuta
• Dioscorea hispida var. daemona
• Dioscorea hispida var. mollissima
• Dioscorea hispida var. reticulata
• Dioscorea virosa
• Dioscorea hirsuta
• Dioscorea lunata
• Dioscorea mollissima
• Dioscorea triphylla var. daemona
• Dioscorea triphylla var. mollissima
• Dioscorea triphylla var. reticulata
• Dioscorea daemona
• Dioscorea daemona var. reticulata
• Dioscorea hispida var. scaphoides

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified under the phylum Streptophyta and the class Equisetopsida. Within the subclass Magnoliidae, it is categorized under the order Dioscoreales and the family Dioscoreaceae. Ultimately, its specific taxonomic identification is placed within the genus Dioscorea.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a wide distribution across several key regions in Asia. Within China, its presence is noted in Hainan, Tibet, and throughout Southeast China. The species also extends into Eastern Asia, specifically being found in Taiwan. Furthermore, it inhabits parts of the Indian Subcontinent, particularly in the Assam region. Collectively, these locations highlight its significant range across diverse Asian landscapes.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Dioscorea hispida is characterized by its distribution across a broad altitudinal gradient, allowing it to occupy diverse montane and sub-montane habitats. It is found at elevations ranging from a minimum of 100 m AMSL to a maximum of 2000 m AMSL, with a mean elevation of approximately 1500 m AMSL. This wide vertical distribution suggests an adaptability to varying climatic conditions, ranging from warmer lowland environments to cooler, more temperate highland zones.

Elevational range max:

2000 m AMSL

Elevational range mean:

1500 m AMSL

Elevational range min:

100 m AMSL

Life history

The life history of Dioscorea hispida is characterized by a perennial lifecycle, allowing the plant to persist through multiple growing seasons. It functions as a geophyte, a strategy where the plant survives unfavorable environmental conditions by storing nutrients and energy in specialized underground organs, such as tubers. This survival mechanism is supported by its classification as a cryptophyte, meaning its essential regenerative buds are located underground, protected from external stressors like drought or temperature fluctuations.

Life form :

geophyte

Life form :

cryptophyte

Lifecycle :

perennial

Morphology

The morphology of Dioscorea hispida is characterized by a non-woody, herbaceous growth form that functions as an obligatory climber. As a terrestrial species, it avoids aquatic or semiaquatic habitats, maintaining an independent lifestyle without acting as a parasite or an epiphyte. The plant's structure is defined by its slender, flexible stems that rely on external support to ascend, distinguishing it from self-supporting shrubs or trees. Through its herbaceous nature, it lacks woody tissue, instead utilizing its climbing habit to navigate its terrestrial environment.

Aquatic :

terrestrial

Climber :

obligatory

Epiphyte :

terrestrial

Growth form :

shrub

Growth form :

herb

Parasite :

independent

Woodiness :

non-woody

Reproduction

The reproduction of Dioscorea hispida is characterized by the development of distinctive fruits that exhibit significant morphological variation in size. The fruits produced by this species typically display a length that ranges from a minimum of 3.5 cm to a maximum of 7 cm, with an observed mean length of 5.25 cm. In terms of diameter, the fruit width varies from a minimum of 2.5 cm to a maximum of 3 cm, maintaining a mean width of 2.75 cm. These dimensions reflect the structural characteristics of the reproductive output, ensuring the dispersal and establishment of the next generation through these varying fruit proportions.

Fruit length max:

7 cm

Fruit length mean:

5.25 cm

Fruit length min:

3.5 cm

Fruit width max:

3 cm

Fruit width mean:

2.75 cm

Fruit width min:

2.5 cm

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

Dioscorea hispida has 1 reported phytochemicals identified across 0 scientific publications and several other databases. The most consistently reported chemicals include STARCH.

STARCH

1. Plant foods for human nutrition (Dordrecht, Netherlands)