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Leaves and Flowers. Copyright CSIRO
Cotyledon stage, epigeal germination. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Ipomoea cairica (L.) Sweet
Sweet, R. (1827) Hort. Brit.: 287. Type: ?.
Convolvulus cairicus L., Syst. Ed.10: 922(1759), Type: Not designated ( Probably from Egypt). Ipomoea palmata Forssk., Flora aegyptiaco-arabica: 43(1775), Type: Egypt, P. Forsskal; Holo: C?. Ipomoea pendula R. Br., Prodr.: 486(1810), Type: Australia, Port Jackson & Tasmania, R. Brown: Syn: BM.
Mile a Minute Vine; Vine, Mile a Minute; Five-leaf Morning Glory; Mile-A-Minute; Railway Creeper; Morning Glory, Five-leaf
Only attains the dimensions of a slender vine.
Corolla trumpet-shaped, about 15-20 x 70-80 mm. Staminal filaments attached to the corolla tube about 5 mm from the base. Filaments clothed in hairs on the basal section.
Capsules about 9-12 x 10-11 mm, two-celled and four-valved. Seeds slightly flattened, about 6 x 6 mm, densely clothed in short brown hairs except for the long (6-8 mm) silky white plumes on the margins. Radicle about 4 mm long, curved. Cotyledons rolled and folded many times. Endosperm dry, permeating between the gaps and folds in the cotyledons.
Cotyledons deeply bilobed, about 34-36 x 23 mm. Petiole about 17 mm long, shallowly grooved on the upper surface. First pair of leaves palmatifid with 5 deeply lobed segments. At the tenth leaf stage: leaves deeply palmately 5-lobed, the lowermost pair of lobes much smaller than the other 3 lobes. Petioles about 2.5-3 cm long, deeply grooved on the upper surface. Stems twining.
Distribution and Ecology
An introduced species originally from Africa and Asia now naturalized in WA, NEQ and southwards as far as Victoria and South Australia. Altitudinal range in northern Australia not known but has been collected just above sea level. Naturalized in many places throughout Malesia.