Causonis maritima (Jackes) Jackes
Jackes, B.R. (2020) Telopea 23: 69-71.
Coastal Water Vine; Vine, Coastal Water
Vine stem diameters to 7 cm recorded.
Leaflet blades about 5.5-10 x 4.5-8 cm, leaflet stalks about 0.7-2 cm long. Middle leaflet normally larger than the lateral leaflets and borne on longer stalks. Lateral veins about 9-14 on each side of the midrib. Leaflet blade margins with about 9-14 serrulate to crenate teeth on each side. Tendril leaf-opposed and usually 3-armed. Leafy twigs and larger twigs elliptic rather than circular in transverse section. Stipules caducous, leaving a broad scar.
Inflorescence leaf-opposed or axillary, each inflorescence about as long as the compound leaves. Flowers about 3-4 mm diam. Calyx cup-shaped, hairy, lobes about 0.1 mm long. Petals about 2 mm long, outer surface hairy, inner surface glabrous. Staminal filaments about 1.1-1.5 mm long, anthers about 0.5 mm long. Disk cream-coloured, lobes about as high as the staminal filaments. Ovary embedded in the disk. Ovules 2 per locule.
Fruits globular or depressed globular about 12 x 9-15 mm. Seeds up to 4 per fruit, each seed shaped like a quarter of a pear or sphere sliced vertically through the central axis. Each seed about 5-7 x 5-6 mm. Testa intruding into the endosperm by way of only one intrusion. Embryo about 1-1.1 mm long. Cotyledons wider than the radicle.
Cotyledons 3-veined, large, about 22 x 17 mm, petiole about 4 mm long. First leaf trifoliolate, middle leaflet about 28-37 x 18-23 mm, lateral leaflets about 25-30 x 13-14 mm. At the tenth leaf stage: leaflet margins toothed, middle leaflet usually longer (larger) than the lateral leaflets. Stipules triangular, about 1 mm long. Tendrils produced about the 9th or 10th leaf stage. Tendrils usually 2-branched.