Australian Tropical Rainforest Plants - Online edition

Guioa lasioneura Radlk.

Shrub (woody or herbaceous, 1-6 m tall)
Click/tap on images to enlarge
Flower and buds. © Barry Jago
Leaves and Flowers. © CSIRO
Fruit, two views, dehiscing, dehisced and arillous seed. © W. T. Cooper
Scale bar 10mm. © CSIRO
Cotyledon stage, epigeal germination. © CSIRO
10th leaf stage. © CSIRO

Radlkofer, L.A.T. (1879) Sitzungsberichte der Mathematisch-Physikalischen Classe der k. b. Akademie der Wissenschaften zu Munchen 4 : 608. Type: Australia orientalis: Dallachy (Rockingham Bay).

Common name

Silky Tamarind; Tamarind, Silky; Woolly Nerved Guioa


Sapwood surface corrugated.


Leaflets sessile or with very short stalks about 0.2-0.5 cm long, swollen at their junction with the rhachis. Leafy twigs and compound leaf rhachis with a dense covering of brown hairs. Usually 2-4 leaflets in each compound leaf. Leaflet blades about 3.5-12.5 x 1.5-4 cm. Midrib hairy and raised on the upper surface of the leaflet blade.


Calyx lobes about 1.5-2.5 mm long. Petals shorter than the calyx. Each petal with a 2-lobed scale on the inner surface. Stamens eight. Disk yellow, unilateral in female flowers but almost continuous in male flowers except for one narrow indentation.


Capsules glabrous, 3-lobed, about 8-14 x 10-22 mm overall. Aril completely enclosing the seed.


Cotyledons fleshy, without venation, apex acuminate. First pair of leaves with opposite or alternate leaflets, margins finely serrate. Petiole and rhachis winged and hairy. At the tenth leaf stage: leaflet blades +/- elliptic, apex acuminate, upper surface with a few hairs along the midrib. Seed germination time 7 to 15 days.

Distribution and Ecology

Endemic to Queensland, occurs in NEQ and CEQ. Altitudinal range from sea level to 1000 m. Grows as an understory tree in well developed lowland and upland rain forest.

Natural History & Notes

Orange arils eaten by Speckled Fruit Bats and several species of birds. Cooper & Cooper (1994).

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