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Information Tuber perennial, usually irregularly subglobose, but occasionally elongate, and sometimes absent. Plant glabrous or the leaf-blade inconspicuously puberulous at the base beneath. Twining stems up to 12 m. long. Leaves as in 3, D. asteriscus. Aerial tubers irregularly subglobose or markedly angular, up to 7 cm. in diameter, brown. Inflorescences as in D. asteriscus, except that the ♂ flowers are sessile and directed downwards, towards apex of inflorescence. Perianth lobes of ♂ flower not spreading; tepals lanceolate, up to 2 mm. long. Perianth lobes of ♀ flower directed towards apex of inflorescence, up to 2 mm. long. Capsule and seeds similar to those of D. asteriscus, but capsule only 2 cm. long and 1.2 cm. in diameter.

Information Tuber annual, spherical (fide Perdue & Kibuwa). Plant glabrous. Twining stems, up to 3 m. long. Leaves alternate; petiole up to 8 cm. long; blade heart-shaped, rather gradually narrowed to an acute acumen, up to 14(–18) cm. long and broad, often much smaller. Aerial tubers irregularly subglobose, up to 5 cm. in diameter, deep purplish. Inflorescences pendulous. Male racemose, up to 4 per leaf-axil or forming a terminal leafless panicle; racemes 10(–15) cm. long; flowers standing out on 1–2 mm. long pedicels at right-angles to the axis; perianth in flower spreading, star-shaped, ± 4 mm. across; tepals lanceolate, very acute. Stamens 6. Female inflorescences spicate, 1–3 per leaf-axil, up to 30 cm. long; flowers solitary at a node, directed downwards; perianth slightly spreading, ± 3(–6) mm. across. Ovary ± 4 mm. long, restricted just below the perianth. Capsule as in fig. 1/3, p. 4, 2.5(–3) cm. long, 1.2–1.5 cm. in diameter, directed upwards. Seeds (fig. 1/3a) winged at basal end, 16 mm. long.