Australian Tropical Rainforest Plants - Online edition
Cissus penninervis (F.Muell.) Planch.
Planchon, J.E. in Candolle, A.L.P.P. de & Candolle, A.C.P. de (1887) Monographiae Phanerogamarum 5 : 520.
Vine stem diameters to 19 cm recorded. Blaze marked by white granular stripes and dark red fibrous stripes.
Stipules oblong, about 2 x 1.5 mm, caducous. Leaflets 3-5 in each compound leaf, leaflet blades about 4-12 x 2-5 cm, leaflet stalks about 0-1 cm long. Lateral vein angle high, almost 90 degrees. 'Oil dots' somewhat elongated and twisted, visible with a lens. Lateral veins forming definite loops inside the blade margin. Tendrils simple (unbranched) leaf-opposed. Oak grain in the twigs.
Inflorescence a much-branched panicle, leaf-opposed or terminal. Flowers about 3 mm diam. Calyx lobes broad and rounded, about 0.1 mm long. Petals reflexed, about 2.1 mm long. Anthers about 0.2 mm long, staminal filaments about 1.1 mm long. Disk about 0.2 mm high. Stigma terminal, crater-like. Ovules two per locule.
Fruits about 14 x 12 mm. Seeds sometimes greenish, about 7.5-9 x 3-4 mm. Embryo small, about 0.5-2 mm long. Cotyledons and radicle of similar lengths but the cotyledons slightly wider.
Cotyledons ovate, about 25 x 15 mm, apex ending in a very short, thickened point. First pair of leaves trifoliolate, the leaflets sessile or nearly sessile, the leaflets narrowly elliptic to oblanceolate, apices acuminate or acute, the bases attenuate to cuneate and oblique on lateral leaflets. Margins sparsely toothed with 1-3 teeth on each side. Oil dots numerous, streaky in outline. At the tenth leaf stage: seedling glabrous. Leaflets 5 per compound leaf, each leaflet blade narrowly elliptic, apex acuminate, base oblique to attenuate, petiole nil, margin with 2-4 small teeth in the apical half. Midrib raised on the upper surface. Oil dots elongated, clearly visible with a lens. Stipules membranous, broad based, about 2.2 mm long. Seed germination time 70 days.