African bitter yam

Names and Synonyms

Common Names

• African bitter yam
• bitter yam
• cluster yam

Scientific Names

Accepted name

Synonyms

• Dioscorea triphylla var. dumetorum
• Helmia dumetorum
• Dioscorea triphylla var. rotundata
• Dioscorea triphylla var. tomentosa
• Dioscorea triphylla var. abyssinica
• Dioscorea buchholziana

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 placed in the order Dioscoreales and the family Dioscoreaceae. It is further categorized under the genus Dioscorea, specifically as the species Dioscorea dumetorum.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant, known as Dioscorea dumetorum, is native to several regions within West Tropical Africa. Its geographical presence is notably documented in the nation of Benin. Furthermore, the species can be found growing within the borders of Burkina Faso. It also extends its distribution into the coastal and inland areas of Ghana. Finally, the plant is established in the West Tropical African countries of Guinea-Bissau and Guinea.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Life history

The life history of Dioscorea dumetorum is characterized by its status as a perennial plant, allowing it to persist through multiple growing seasons. As a geophyte, it survives unfavorable environmental conditions by retreating to underground storage organs, which provide the necessary energy reserves for regrowth. This survival strategy is further supported by its classification as a cryptophyte, meaning its perennating buds are located safely below the soil surface, protecting the plant's vital structures from external stressors such as drought or seasonal temperature fluctuations.

Life form :

geophyte

Life form :

cryptophyte

Lifecycle :

perennial

Morphology

The morphology of Dioscorea dumetorum is characterized by its growth form as a non-woody herb that functions as an obligatory climber, specifically taking the form of a liana. This plant reaches an average height of approximately 5.91 meters, utilizing its climbing habit to ascend within its environment. It is strictly a terrestrial species, lacking any aquatic, semiaquatic, or epiphytic tendencies, and it operates as an independent organism rather than a parasite.

Aquatic :

terrestrial

Climber :

liana

Climber :

obligatory

Epiphyte :

terrestrial

Growth form :

herb

Parasite :

independent

Plant height mean:

5.91441111933333 m

Woodiness :

non-woody

Physiology

The physiology of Dioscorea dumetorum is characterized by specialized metabolic processes geared toward the efficient storage of complex carbohydrates within its tuberous rhizomes. As a member of the Dioscoreaceae family, its primary physiological function involves the synthesis and accumulation of starch, which serves as a critical energy reserve for the plant's perennial life cycle. The plant's nutrient acquisition strategies are strictly dependent on the availability of mineral elements in the soil substrate, as it lacks the biological mechanisms for symbiotic atmospheric nitrogen uptake; specifically, it is not a nitrogen fixer. This absence of nitrogen-fixing capabilities means the plant relies entirely on the nitrification and mineralization processes within the rhizosphere to obtain the nitrogen required for protein synthesis and chlorophyll production. Furthermore, its physiological development is driven by seasonal cycles, where photosynthetic activity in the aerial foliage facilitates the translocation of sucrose to the underground storage organs, facilitating robust tuber expansion during periods of optimal environmental conditions.

Nitrogen fixer :

no

Reproduction

The reproduction of Dioscorea dumetorum is characterized by a specific seasonal cycle and specialized seed dissemination mechanisms. The fruiting process is concentrated within a narrow window, with both the commencement and conclusion of the fruiting period occurring in October. Regarding the dispersal of its reproductive units, the plant utilizes an anemochorous syndrome, meaning its seeds or fruits are primarily dispersed by wind. This anemochorous trait is consistent across its dispersal strategies, ensuring that environmental air currents play the fundamental role in the spread and colonization of the species.

Dispersal syndrome :

anemochorous

Fruiting time :

Oct

Sources: Global Inventory of Floras and Traits (GIFT)

Chemicals

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

Dioscoretine

1. Planta medica

Preparations

Dioscorea dumetorum has 4 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include aqueous fraction, aqueous fraction of the methanol extract, chloroform fraction of the same extract, methanol extract.

Aqueous fraction

1. Planta medica

Aqueous fraction of the methanol extract

1. Planta medica

Chloroform fraction of the same extract

1. Planta medica

Methanol extract

1. Planta medica