Hibiscus heterophyllus Vent.
Ventenant, E.P. (1805) Jardin Malmaison 2: t.103. Type: Ventenants plate.
Native Cottonwood; Queensland Sorrel; Green Kurrajong; Native Hibiscus; Hibiscus, Native; Native Rosella
Flowers and fruits as a shrub or small tree up to 6 m tall.
Leaf blades ovate to deeply 3-lobed, about 14-20 x 4-18 cm. Both the upper and lower surfaces of the leaf blade clothed in small spines with swollen bases. Stellate hairs visible on the lower surface of the leaf blade, much sparser on the upper surface. Petioles and twigs clothed in short spines. Stipules small, triangular, about 1-1.5 mm long. Twig bark strong and fibrous when stripped.
Pedicels about 20 mm long. Epicalyx segments about 7-10, each about 20 mm long. Calyx about 20 mm long, outer surface densely clothed in stellate hairs. Petals about 5-8 cm long. Corolla mainly yellow, but dark red towards the centre. Staminal column about 25 mm long, staminal filaments about 1.5-2 mm long. Ovary clothed in appressed straight white hairs.
Capsules about 15-20 mm long, clothed in erect, light brown hairs which irritate the skin. Seeds glabrous, dark brown and angular.
Hypocotyl hairy. Cotyledons ca. 13-21 x 15-20 mm, one large than the other. Petioles 17-22 mm long. Cotyledons broadly ovate. Hairy on all plant parts, hairs glandular. First leaves toothed, not lobed, blades 4-5 x 2.5-3.2 cm. Stem cylindric. As seedling matures hairs on stem become spines. Leaves gradually become lobed, lobes deeping as seedling develops. Leaves toothed, paler green on undersurface. Taproot present. Seed germination time 112 to 225 days.
A fine quick growing shrub for a sunny position in the garden. Flowers are large yellow with a red centre.
This plant has been reported as being edible. However, there is a report of kidney damage after drinking tea made from the leaves. (http://www.newcrops.uq.edu.au/newslett/ncnl8111.h tm)