Merremia tuberosa (PROSEA)

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Plant Resources of South-East Asia
Introduction
List of species


Merremia tuberosa (L.) Rendle


Protologue: Fl. Trop. Afr. 4(2): 104 (1905).

Synonyms

Ipomoea tuberosa L. (1753), Operculina tuberosa (L.) Meissn. (1869).

Vernacular names

  • Wood rose, Brazilian jalap (En)
  • Indonesia: areuy kawoyang (Sundanese)
  • Vietnam: bìm củ.


Distribution

Probably of Central American origin, now distributed throughout tropical Africa, the Mascarene Islands, India and Sri Lanka; in India and Malesia cultivated as a medicinal and sometimes escaped from cultivation.

Uses

In South-East Asia, the tuber is used as a drastic purgative. The plant is also planted as an ornamental in Africa. The woody fruits are used in flower arrangements in Europe.

Observations

A perennial, glabrous twiner, 3-5 m long, stems robust, finely striate, tuber large; leaves orbicular in outline, 6-16 cm × 6-16 cm, palmately divided to far below the middle, segments 7, oblong-lanceolate, apex acuminate, base narrowed, entire, the middle segment larger than the lateral ones, petiole 6-18 cm long; flowers in a few-flowered cyme, peduncle 4-15 cm long, bracts triangular, small; flower-buds oblong, apex pointed, pedicel 15-18 mm long, in fruit clavate, up to 5 cm long, sepals subequal, outer ones 25 mm long, ovate, obtuse, inner ones oblong, in fruit 5-6 cm long, enclosing the capsule, corolla funnel-shaped, 5.5 cm long, yellow, anthers twisted; capsule subglobose, 3.5 cm in diameter, pericarp thin, splitting irregularly, and loosening circumsessile at base; seeds 17 mm long, black, black pubescence on sides. In Indonesia, M. tuberosa occurs from sea-level up to 600 m altitude. The loosening of the capsulewall is different from that of Operculina , where the wall shows 2 layers, and the outer one is fleshy in the upper part, forming an operculum.

Selected sources

134, 647.

Authors

Muhammad Mansur