Ailanthus Desf.

First published in Mém. Acad. Sci. (Paris) 1786: 265 (1788), nom. cons.
This genus is accepted
The native range of this genus is Tropical & Subtropical Asia to N. Australia.

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 six to ten species from Turkmenistan, India, China, Malesia and northern Australia. A single native species in New Guinea and the Solomon Islands, Ailanthus integrifolia Lam. ex Steud.
Morphology General Habit
Trees to 60 m
Morphology Leaves
Leaf scars conspicuous on branches Leaves alternate, imparipinnate or paripinnate, sometimes rachis tip prolonged or apical leaf smaller in size, petioles pulvinate, leaflets opposite, strikingly oblique at the base, margins entire (in New Guinea), glands present along midrib on underside
Morphology Reproductive morphology Inflorescences
Inflorescences axillary, many-branched, lax thyrses. Flowers 5(–6)-merous, functionally unisexual; calyx closed in bud, tearing irregularly into 2 lobes (in New Guinea); petals valvate in bud; stamens 10; ovary apocarpous, carpels 5 (in New Guinea), free, styles 5, fused at the base (in New Guinea)
Morphology Reproductive morphology Fruits
Fruit of 1–5 samaroid mericarps, the wing completely surrounding the seed
Morphology Reproductive morphology Seeds
Seed 1 per mericarp, flattened
Ecology
Found in rain forests from sea level to 900 m, locally common in the north of mainland New Guinea.
Recognition
Ailanthus can be recognised by compound leaves with strikingly oblique bases to the leaflets, many-branched inflorescence, 5-merous flowers with 10 stamens and 5 carpels, and samaroid fruit.
[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