Palaquium Blanco

First published in Fl. Filip.: 403 (1837)
This genus is accepted
The native range of this genus is Tropical & Subtropical Asia to W. Pacific.

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 121 species distributed from tropical and subtropical Asia to the western Pacific. At least 13 or 14 species occur in New Guinea (eight endemic) and there are five species in the Solomon Islands (two endemic).
Morphology General Habit
Hermaphroditic or rarely dioecious trees to c. 50 m
Morphology Leaves
Leaves spirally arranged; secondary venation eucamptodromous and becoming less distinct towards margins; tertiary venation often somewhat oblique and connecting secondary veins
Morphology Reproductive morphology Inflorescences
Inflorescences axillary or in axils of fallen leaves, 1–several flowers per fascicle
Morphology Reproductive morphology Flowers
Flowers bisexual or rarely unisexual, often star-shaped or rotate with a corolla tube usually shorter than lobes; calyx of 2 whorls and 6 sepals (2 × 3), the outer whorl ±valvate; corolla lobes entire, usually 6 and contorted (rarely imbricate); stamens (10–)12(–30) in 1(–3) whorl, inserted just below the corolla tube orifice or base of the corolla lobes; anthers hairy or glabrous; staminodes absent; ovary usually 6-locular and hairy (rarely glabrous); style usually long and exserted. Fruit 1–2(–several)-seeded; seed broadly oblong or ellipsoid with scar covering up to ⅔ of the seed surface, or seeds laterally compressed with a narrow scar; cotyledons plano-convex with included radicle and no endosperm.
Ecology
In New Guinea, Palaquium are often large trees in primary and secondary forests (including costal, flat, hill and swamp forests) on a variety of substrates such as overlying ultrabasic material or limestone, to an elevation of 0–500 m.
Recognition
The genus can be recognised by flowers having 6 sepals in two whorls (2 × 3), exserted style, entire corolla lobes, usually 12 stamens, and absence of staminodes. Palaquium may be confused with Manilkara since both have a calyx of 2 whorls of sepals, 3 in each, but Manilkara has subdivided corolla lobes and staminodes, while Palaquium has entire corolla lobes and no staminodes.
[TONG]

Sources

  • Herbarium Catalogue Specimens

  • 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