Pterocymbium R.Br.

First published in Pterocymbium: 219 (1844)
This genus is accepted
The native range of this genus is Assam to Papuasia, Fiji.

Descriptions

Timothy M. A. Utteridge and Laura V. S. Jennings (2022). Trees of New Guinea. Kew Publishing. Royal Botanic Gardens, Kew

Distribution
A genus of five to ten species, not well understood at the species level. Pterocymbium is distributed from Thailand to Fiji. Currently two species recorded in New Guinea: P. beccarii K.Schum and Pterocymbium micranthum Mildbr.; the genus is not recorded from the Solomon Islands.
Morphology General Habit
Deciduous trees to 40 m, often with short buttresses
Morphology General Indumentum
Indumentum of stellate hairs
Morphology Leaves Stipules
Stipules present, caducous
Morphology Leaves
Leaves alternate, usually simple, sometimes 3–5-lobed, cordate or rounded at the base, margin entire
Morphology Reproductive morphology Inflorescences
Inflorescences axillary, crowded towards end of the branches. Flowers unisexual, at least functionally; calyx 5-lobed, greenish, white to reddish, persistent in fruit; androgynophore present, stamens usually 10, subsessile, in a single whorl, in female flowers sterile anthers concealing carpels, carpels 4–6, 2 ovules per carpel, styles initially slightly coherant, stigmas free
Morphology Reproductive morphology Fruits
Fruit of 1–6 winged or spurred follicles, dehiscing before maturity
Morphology Reproductive morphology Seeds
Seed 1 per follicle.
Ecology
Pterocymbium occurs in seasonally dry habitats up to 1000 m.
Recognition
In New Guinea, Pterocymbium flowers on leafless branches, and the flowers are described as being greenish- to blueish-white (P. beccarii) or red (P. splendens), and the fruit comprised of up to 5 single-seeded follicles with a wing- or spur-like papery projection is unmistakeable. Like Firmiana, Pterocymbium has a many-flowered, paniculate inflorescence, but in New Guinea, the flowers are relatively larger than those of Firmiana, and the follicles are single seeded (with at least 2 marginal seeds in Firmiana); in addition, Firmiana has purple flowers.
[TONG]

Sources

  • Kew Backbone Distributions

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Kew Names and Taxonomic Backbone

    • The International Plant Names Index and World Checklist of Vascular Plants 2024. Published on the Internet at http://www.ipni.org and https://powo.science.kew.org/
    • © Copyright 2023 International Plant Names Index and World Checklist of Vascular Plants. http://creativecommons.org/licenses/by/3.0
  • Trees of New Guinea

    • Trees of New Guinea
    • http://creativecommons.org/licenses/by-nc-sa/3.0