Pilidiostigma Tetramerum L.S.Sm

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Australian Tropical Rainforest Plants - Online edition Pilidiostigma tetramerum L.S.Sm. Family: Myrtaceae Smith, L.S. (1959) Proceedings of the Royal Society of Queensland 70: 30. Type: Queensland, Hugh Nelson Range, ca. 2 miles S. of the Crater, 20 Nov. 1958, L.S. Smith 10505; holo: BRI, Iso: A, BISH, CANB, K, NSW. Stem Occasionally recorded as a small tree but usually flowers and fruits as a shrub about 2-3 m tall. Leaves Leaf blades about 7-8 x 2-2.5 cm. Venation difficult to discern. Two intramarginal veins visible on the leaf blade, the outer one less obvious, about 0.5-1 mm from the margin, the inner one about 2 mm from the margin. Petiole +/- transversely wrinkled, flattened or channelled on the upper surface. Oil dots quite numerous. Flowers Calyx glabrous, lobes dimorphic, the larger two +/- petaloid. All calyx lobes marked by oil glands. Flower. © Barry Jago Petals concave, +/- orbicular, about 2.5 mm diam., oil glands less obvious than those on the calyx lobes. Staminal disk flat-topped, stamens arranged in a single row with only occasional overlaps. Stigma terminal, peltate, significantly wider than the style. Fruit Fruits depressed globular, about 15 mm diam., +/- triangular in transverse section, calyx lobes persistent at the apex. Seeds angular, about 7-8 mm diam., cotyledons fused together, the radicle transversely oriented in the seed. Testa +/- smooth. Seedlings Flowers [not vouchered]. © G. Cataphylls about 2 or 3 pairs, produced between the cotyledons and the first pair of true leaves. At Sankowsky the tenth leaf stage: leaf blade elliptic, apex acute, base cuneate or attenuate, oil dots visible with a lens. Leaf venation difficult to discern. Stipules caducous, small and inconspicuous. Stem glabrous, 4-angled or winged. Seed germination time 134 to 191 days. Distribution and Ecology Endemic to NEQ. Altitudinal range from near sea level to 1200 m. Grows as an understory plant in undisturbed lowland, upland and mountain rain forest. RFK Code Flowers [not vouchered]. © G. 3364 Sankowsky Copyright © CSIRO 2020, all rights reserved. leaf and flowers [not vouchered]. © G. Sankowsky Fruit, three views, cross section and seed. © W. T. Cooper Scale bar 10mm. © CSIRO Cotyledon stage, hypogeal germination. © CSIRO 10th leaf stage. © CSIRO Web edition hosted at https://apps.lucidcentral.org/rainforest.

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Species information Abo ut Reso urces Hom e A B C D E F G H I J K L M N O P Q R S T U V W X Y Z Pilidiostigma papuanum Click on images to enlarge Family Myrtaceae Scientific Name Pilidiostigma papuanum (Lauterb.) A.J.Scott Scott, A.J. (1978) Kew Bulletin 33: 327. Flowers [not vouchered]. Copyright G. Sankowsky Stem Can grow into a small tree but usually flowers and fruits as a shrub about 1-3 m tall. Leaves 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. Flowers [not vouchered]. Copyright G. Sankowsky Flowers 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. Fruit Fruits ovoid, about 25-30 x 15-20 mm, calyx lobes persistent at the apex. Seeds variable in size, about 20-22 Leaves and fruit [not vouchered]. Copyright G. Sankowsky 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. Seedlings Cataphylls about 1-3 pairs, produced before the first pair of true leaves.
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