Quassia and Tree of Heaven Family

Mostly evergreen trees and shrubs. Leaves alternate, pinnate or occasionally simple; stipules mostly absent. Flower clusters in spikes or dense branched clusters. Flowers mostly unisexual, small, regular. Sepals and petals usually 5 (rarely 3-8), free or united, petals occasionally absent. Sepals tubular. Disk between the petals and stamens. Stamens free, the same number as or double that of the petals. Ovary superior, of 2-5 chambers, each with 1(2) ovules with axile placentation. Carpels 2-5, fused or free below, but united at the style or stigma. Fruit a schizocarp, samara or capsule, rarely a berry or drupe.

Generally considered to be closely related to the Rutaceae.

About 22 genera and 160 species throughout the tropics and subtropics. Australia has 4 genera and 6 species.

Quassia and other genera have medicinal uses; some trees are used for timber.

Leaves compound, alternate; fruit, in cultivated plants, a samara.

Source: Spencer, R. (2002). Simaroubaceae. In: Spencer, R.. Horticultural Flora of South-eastern Australia. Volume 3. Flowering plants. Dicotyledons. Part 2. The identification of garden and cultivated plants. University of New South Wales Press.

Hero image
kingdom Plantae
phylum   Tracheophyta
class    Magnoliopsida
superorder     Rosanae
order      Sapindales
Higher taxa
Subordinate taxa
genus        Ailanthus Desf.