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Scale bar 10mm. Copyright CSIRO
Fruits, side and seeds. Copyright W. T. Cooper
Leaves and Flowers. Copyright CSIRO
Cotyledon stage, epigeal germination. Copyright CSIRO
Vine stem bark and vine stem transverse section. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Ipomoea macrantha Roem. & Schult.
Roemer, J.J. & Schultes, J.A. (1819) Systema Vegetabilium 4: 251. Type: Old world tropics (?).
Twigs and petioles produce a milky exudate. Leaf blades about 5-14 x 7-13 cm, petioles about 3-10 cm long. Two flat reddish glands visible on the underside of the leaf blade on the petiole close to its junction with the leaf blade.
Sepals about 35 x 15-20 mm, tightly clasping the base of the flower. Corolla tube about 60-80 mm long and about 60-100 mm diam. at the apex. Corolla white except for a pink centre near the base. Stamens inserted near the base of the corolla tube. Stigma bilobed.
Fruits rather papery, about 20-30 mm diam. Calyx lobes persistent at the base and spreading like the petals of a rose. Seeds about 4-6 per fruit, each seed slightly depressed globose, about 8-11 mm diam., densely clothed in short dark hairs except for a ring of white hairs about 5 mm long around the equator. Cotyledons folded in a complex fashion.
Features not available.
Distribution and Ecology
Occurs in WA, NT, CYP, NEQ and southwards to south-eastern Queensland. Altitudinal range in northern Queensland not very great, from near sea level to 100 m. Restricted to maritime situations, growing in beach forest, monsoon forest and rain forest. Also occurs in tropical America, tropical East Africa, Asia, Malesia and the Pacific islands.