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Scale bar 10mm. Copyright CSIRO
Cotyledon stage, hypogeal germination. Copyright CSIRO
10th leaf stage. Copyright CSIRO
Pilidiostigma papuanum (Lauterb.) A.J.Scott
Scott, A.J. (1978) Kew Bulletin 33: 327. Type: ?.
Decaspermum papuanum Lauterb., Nova Guinea 8: 319(1910), Type: New Guinea, 6 Dec. 1907, Branderhorst 270; Holo: WRSL; Iso: K. Jambosa papuanum (Lauterb.) Diels, Beitrage zur Flora von Papuasien 8: 384(1922), Type: ?. Pilidiostigma recurvum (C.T.White) A.J.Scott, Kew Bulletin 33: 326(1978), Type: ?. Rhodomyrtus recurva C.T.White, Proceedings of the Royal Society of Queensland 47: 63(1936), Type: Queensland, Mossman River Gorge, 2 Feb 1932, L. J. Brass 2127; holo: BRI. Eugenia brassii Merr. & L.M.Perry, Journal of the Arnold Arboretum 23: 247(1942), Type: Papua, Tarara, Wassi Kussa River, Brass 8429; holo: A, iso: K, L.
Can grow into a small tree but usually flowers and fruits as a shrub about 1-3 m tall.
Leaf blades about 13 x 4 cm. Two intramarginal veins visible on the leaf blade, the outer vein about 0.5-2 mm from the margin and the inner vein about 2-5 mm from the margin. Lateral veins inconspicuous. Petiole flat or channelled on the upper surface. Oil dots quite numerous, pale brown (?) in colour.
Calyx glabrous. Petals ovate or almost orbicular, about 7-9 x 6-7 mm, marked by numerous oil glands. Staminal disk flat-topped, stamens in many concentric circles. Pollen white. Stigma terminal, slightly wider than the style.
Fruits ovoid, about 25-30 x 15-20 mm, calyx lobes persistent at the apex. Seeds variable in size, about 20-22 x 5-6 mm. Testa +/- smooth but marked by numerous oil glands. Anatomy of the seed difficult to interpret. Cotyledons fused together, radicle +/- at right angles to the long axis of the larger cotyledon and completely envelops the smaller cotyledon.
Cataphylls about 1-3 pairs, produced before the first pair of true leaves. At the tenth leaf stage: leaf blade obovate to elliptic, apex obtuse or almost acute, base cuneate or attenuate, glabrous. Oil dots quite numerous, visible with a lens. Stipules very small and inconspicuous.
Distribution and Ecology
Herb (herbaceous or woody, under 1 m tall)
Shrub (woody or herbaceous, 1-6 m tall)