Australian Tropical Rainforest Plants - Online edition
Tetrastigma petraeum Jackes
Jackes, B.R. (1989) Austrobaileya 3(1): 153. Type: Queensland, Walleroo Hill, Herbert River, 18 08 S, 145 20 E, 30 March 1980, E. M. Jackes; holo: BRI; iso: CANB, L, NSW.
Vine stem diameters to 5 cm recorded.
Leaflet blades about 4.5-9 x 3-6.5 cm, the middle leaflet usually slightly larger than the lateral leaflets. Leaflet stalks about 5-20 mm long, the stalk of the middle leaflet usually longer than those of the lateral leaflets. Lateral veins about 4-7 on each side of the midrib. Stipules broad based, about 2-4 mm long. Tendrils simple (unbranched) leaf-opposed, often with a few thickened gland-like structures at the apex. Teeth usually 4 or 5 on each side of the leaflet blade.
Cotyledons ovate to cordate, about 37 x 30-32 mm. First pair of true leaves usually simple but the second true leaf may sometimes be bifoliolate or trifoliolate. At the tenth leaf stage: leaflets ovate to elliptic, apex acuminate, base cuneate to obtuse. Margins with 3-5 teeth along each side. Midrib raised on the upper surface. Lateral veins 3-5 on each side of the midrib. Taproot thick and swollen, somewhat carrot-like. Seed germination time 119 days.
Endemic to Queensland, occurs in NEQ and CEQ. Altitudinal range from 400-800 m. Usually grows in rocky situations in open forest, vine thicket or monsoon forest.