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Scale bar 10mm. Copyright CSIRO
Leaves and fruit. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Leaves and dehiscing fruit. Copyright CSIRO
Cotyledon stage, hypogeal germination. Copyright CSIRO
Alectryon tropicus (S.T.Reynolds) S.T.Reynolds
Reynolds, S.T. (1984) Austrobaileya 2(3): 335. Type: ?.
Heterodendron tropicum S.T.Reynolds, Austrobaileya 1: 484(1983), Type: Queensland, Mungana, 16 Jun. 1946, H. Flecker N. Q. N. C. No 10423; holo: BRI; iso: QRS.
Leaf blades about 5-12 x 1-2.5 cm, very gradually tapering into the petiole. Midrib raised on the upper surface. Many lateral veins extend to the leaf margin which is somewhat thickened and vein-like. Young twigs and terminal buds clothed in short, pale, prostrate hairs.
Fruit usually 2-lobed, rarely 1-lobed, about 13-22 x 16-28 mm. Pericarp thick (up to 6 mm) gritty. Fruit rupturing irregularly around the equatorial region (circumscissile) to expose the black spot on the testa. Seeds globose, about 8 x 7 x 6 mm. Testa mainly brown except for a black area away from the aril. Aril granular, covering 60-70% of the seed but confined to the base.
Cataphylls(?) similar to the first true leaves but much shorter and narrower. First true leaves narrow, elliptic to oblong to obovate, apex mucronate, base attenuate, midrib raised on the upper surface. At the tenth leaf stage: leaf blade narrowly elliptic to oblong or obovate, rather stiff and hard, apex mucronate, base attenuate, margin undulate; midrib raised on the upper surface; lateral veins about 15-20 on each side of the midrib. Petiole swollen at its point of attachment to the twig.
Distribution and Ecology