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Scale bar 10mm. Copyright CSIRO
Leaves and male flowers. Copyright CSIRO
Leaves and fruits. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Male flowers. Copyright CSIRO
Vine stem bark and vine stem transverse section. Copyright CSIRO
1st leaf stage, cotyledons absent. Copyright CSIRO
Female flowers. Copyright CSIRO
Pachygone ovata (Poir.) Miers ex Hook.f. & Thomson
Roxburgh, W. in Carey, W. (ed.) (1855) Flora Indica 1: 203. Type: ?.
Cissampelos ovata Poir., Encycl. Meth. Bot. 5: 10(1804), Type: Indes orientales, P. Sonnerat. Holo: P?. Pachygone ovata var. dasyphylla Miq., Annales Musei Botanici Lugduno-Batavi 4: 87(1868), Type: Iava: HORSFIELD. Pachygone pubescens Benth., Flora Australiensis 1: 58(1863), Type: Queensland. Quail Island, Sept 1855, J. Flood. Holo: K. Iso: MEL. Cebatha pubescens (Benth.) Kuntze, Revisio Generum Plantarum 1: 9(1891), Type: ?. Tristichocalyx pubescens (Benth.) F.Muell., Fragmenta Phytographiae Australiae 4: 27(1863), Type: ?. Tinospora hullsii F.Muell., Fragmenta Phytographiae Australiae 5: 147(1866), Type: Northern Territory, Escape Cliffs, C. Hulls. Holo: MEL. Iso: BRI, K. Pachygone hullsii (F.Muell.) F.Muell., Fragmenta Phytographiae Australiae 9: 81(1875), Type: ?.
Leaf blades +/- papery, about 4-15 x 2-9 cm, petioles about 1.2-6.5 cm long, very thin, about 1 mm diam. Upper and lower leaf blade surfaces often clothed in pale hairs. Oak grain visible in the twigs.
Male flowers: Inflorescence about 5-15 cm long, consisting of a number of short racemes on a central axis. Sepals three + three in two whorls, the outer ones smaller, about 1 mm long, inner sepals much wider and about 2 mm long. Petals about 1.5 mm long, the base bilobed, the lobes clasping or enveloping the base of the staminal filament. Stamens five or six per flower, filaments about 1-1.5 mm long. Female flowers: Inflorescence a raceme. Sepals three + three in two whorls, the outer ones smaller, about 1-1.5 x 1 mm, inner sepals about 2 x 2 mm. Petals six, about 1.5 x 1 mm, basal auricles enveloping the base of the staminodes. Staminodes small, usually six. Carpels three, placed close together, stigma sessile at the apex of each carpel and projecting +/- at right angles to the axis of the carpel.
Fruits globose, slightly compressed laterally, about 6-7 mm diam. Style persistent, located close to the base of the fruit. Seeds (endocarps) about 5-6 x 5 mm, laterally compressed, outer surface somewhat sculptured. Embryo U-shaped. Cotyledons U-shaped, about 8-10 mm long. Radicle about 0.5-0.6 mm long. Endosperm scanty.
Cataphylls 1 or 2, produced before the first pair of true leaves. First pair of true leaves +/- cordate, apex acute, base cordate. Both the upper and lower surfaces of the leaf blades clothed in hairs. Margins usually with one large tooth or small lobe on each side. Pulvinus present on the petiole. At the tenth leaf stage: leaf blade cordate, about 9-10 x 5-6 cm, apex acuminate to apiculate, base cordate, midrib slightly raised on the upper surface. Terminal bud and stem clothed in brown hairs.
Distribution and Ecology
Occurs in WA, NT, CYP, NEQ and southwards as far as coastal central Queensland. Altitudinal range from near sea level to 500 m. Grows in beach forest, monsoon forest and the drier more seasonal rain forests. Also occurs in Sri Lanka, SE Asia and Malesia.