Australian Tropical Rainforest Plants - Online edition
Acacia hylonoma Pedley
Pedley, L. (1978) Austrobaileya 1: 214. Type: Qld, east of May Peak, Yarrabah Aboriginal Reserve, Dec. 1972, Webb & Tracey 10764; holo: BRI.
Yarrabah Wattle; Wattle
Bark usually somewhat yellowish-brown.
Leaves green, phyllodineous. Leaf blades about 8-13.5 x 0.7-1.6 cm. A gland usually present on the upper edge of the leaf blade, about 9-17 mm from the base. Veins longitudinal, anastomosing, about 4-10 veins more prominent than the rest. A small ridge normally apparent running down the leafy twigs from the base of each petiole.
Inflorescence usually consisting of two pairs of heads, peduncles about 5-8 mm long, glabrous, heads about 25-flowered. Calyx glabrous, about 1.1-1.2 mm long, eventually separating into distinct lobes. Corolla about 1.8-2 mm long, about 1.5 times as long as the calyx. Stamens about 2.5 mm long. Ovary glabrous.
Cotyledons oblong or elliptic, about 4 mm long. First leaf pinnate, second leaf bipinnate. By the third or fourth leaf stage: leaves bipinnate, petiole often expanded. At the tenth leaf stage: leaves phyllodineous, linear, +/- falcate, glabrous, about 4-6 main parallel veins run from the base to the apex; a small gland usually present on the upper edge of the leaf blade near the junction of the leaf blade and the petiole; stipules very small, visible only with a lens; stellate hairs visible with a lens. Seed germination time 3 to 147 days.