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Atalaya australiana

Family

Sapindaceae

Botanical Name

Atalaya australiana Leenh.

Leenhouts, P.W. (1965) Blumea 13(1): 126. Type: ?.

Synonyms

Sapindus australis Benth., Flora Australiensis 1: 464(1863), Type: Queensland. Cape York, Mgillivray.

Stem

Usually grows as a small or medium-sized tree to 20 m but also flowers and fruits as a shrub. Bark corky.

Leaves

Twigs and petioles clothed in short simple hairs. Compound leaves with about 2-8 leaflets. Leaflet blades about 10-14 x 4-7 cm, leaflet stalks about 3-10 mm long. Lateral veins about 9-12 on each side of the midrib.

Flowers

Sepals about 2-4 x 2 mm, slightly hairy on the outer surface. Petals about 4-5 x 1-2 mm, outer surface clothed in prostrate hairs, inner surface with two scale-like appendages near the base. Stamens eight, filaments about 0.2-1 mm long, anthers about 0.9-1.2 x 0.5 mm. Disk surrounding the base of the ovary and outside the stamens. Style about 0.2-0.5 mm long.

Fruit

Fruits usually distinctly 3-winged (or less by abortion). Each complete wing + basal seed part about 25 x 6 mm. Seeds about 6 x 5.5 mm, testa soft and leathery. Cotyledons as large as the seed. Radicle about 2 mm long, much smaller than the cotyledons.

Seedlings

Cotyledons thick and wrinkled, about 10 mm long. First pair of leaves simple and opposite, margins smooth, lateral veins forming loops inside the blade margin. At the tenth leaf stage: leaf simple or compound, lateral veins forming loops inside the blade margin.

Distribution and Ecology

Probably endemic to Australia, occurs in CYP and NEQ. Altitudinal range from near sea level to 250 m. Grows in rain forest, monsoon forest, vine thickets and open grassland.

CYP

X

Shrub (woody or herbaceous, 1-6 m tall)

X

Tree

X

RFK Code

1186