Clausena Burm.f.

First published in Fl. Indica: 243 (1768)
This genus is accepted
The native range of this genus is Tropical & Subtropical Old World.

Descriptions

Rutaceae, J.O. Kokwaro (University of Nairobi). Flora of Tropical East Africa. 1982

Morphology General Habit
Unarmed shrubs or trees
Morphology Leaves
Leaves pinnate, alternate, densely dotted with pellucid glands, deciduous
Morphology Reproductive morphology Inflorescences
Inflorescence a terminal or axillary panicle or lax raceme
Morphology Reproductive morphology Flowers
Flowers bisexual
Morphology Reproductive morphology Flowers Calyx
Sepals 4–5, united at the base, very small
Morphology Reproductive morphology Flowers Corolla
Petals 4–5, free, imbricate in bud
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 8–10, inserted at the base of the disk; filaments subulate, flattened towards the base; anthers elliptic, dorsifixed, introrse
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary stalked, (2–3–)4–5-locular, with 2 ovules in each locule; style short, caducous; stigma 2–5-lobed, broad, obtuse
Morphology Reproductive morphology Fruits
Fruit fleshy, oblong, ovoid or globose, 2–5-locular
Morphology Reproductive morphology Seeds
Seeds oblong.
[FTEA]

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

Distribution
A genus of about 25 species with a wide distribution from tropical Africa and Asia to Australia and New Guinea. A single species in New Guinea, Clausena brevistyla Oliv.
Morphology General Habit
Trees and shrubs to 15 m tall
Morphology General Indumentum
Hairs simple when present
Morphology Leaves
Leaves alternate, compound and imparipinnate with 5–15(–31) alternate leaflets, petiolules present, margins entire to crenate or serrulate, gland dots present, secondary veins anastamosing
Morphology Reproductive morphology Inflorescences
Inflorescences usually terminal, lax panicles or racemes, flowers often clustered near the ultimate branches of the axis
Morphology Reproductive morphology Flowers
Flowers bisexual; 4–5-merous, buds subglobose; calyx cupular with 4–5 lobes; petals free, imbricate in bud; stamens 8–10, in 2 unequal whorls, filaments shorter than the petals, anthers ovate to elliptic; disk gynophorous, glabrous; ovary syncarpous, 2–5-locular, ovules 2 per locule, style short, at most equalling length of ovary, persistent or not, often narrowing when it meets the ovary, stigma punctate
Morphology Reproductive morphology Fruits
Fruit a berry, subglobose to ovoid
Morphology Reproductive morphology Seeds
Seed usually 1 per fruit.
Ecology
In New Guinea, Clausena occurs in lowland rain forest, often near lakes or river, between 25–1000 m.
Recognition
The genus can be recognised by the imparipinnate leaves with 5–15 alternate leaflets, the lax, paniculate inflorescences, the 4–5-merous flowers with 8–10 stamens, the ovary on a gynophorous disk and the round baccate fruit usually with a single seed.
[TONG]

Rutaceae, F. A. Mendoça. Flora Zambesiaca 2:1. 1963

Morphology General Habit
Unarmed trees or shrubs.
Morphology Leaves
Leaves alternate, pinnate, densely dotted with pellucid glands.
Morphology Reproductive morphology Inflorescences
Inflorescence of axillary cymose panicles.
Morphology Reproductive morphology Flowers
Flowers small, 4-merous, bisexual.
Morphology Reproductive morphology Flowers Calyx
Sepals 4–5, very small, united at the base.
Morphology Reproductive morphology Flowers Corolla
Petals 4–5, imbricate in bud.
Morphology Reproductive morphology Flowers Androecium Stamens
Stamens 8–10, inserted at the base of the disk; filaments subulate, flattened towards the base; anthers elliptic, dorsifixed, introrse.
Morphology Reproductive morphology Flowers Gynoecium Pistil
Ovary (2–3) 4–5-locular, with 2 ovules in each loculus; style short, caducous; stigma broad, obtuse, 2–5-lobed.
Morphology Reproductive morphology Fruits
Fruit baccate, 1–2-seeded.
[FZ]

Sources

  • Flora Zambesiaca

    • Flora Zambesiaca
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • Flora of Tropical East Africa

    • Flora of Tropical East Africa
    • http://creativecommons.org/licenses/by-nc-sa/3.0
  • 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