Synonyms: Choricarpia APNI*
Description: Trees or shrubs.
Leaves opposite, venation obvious, petiolate.
Inflorescences axillary or terminal, variable. Flowers 4- or 5-merous. Sepals often prominent, sometimes petaloid, persistent in fruit. Petals usually shorter than sepals, persistent in fruit. Stamens numerous, free in several whorls; anthers versatile. Ovary half-inferior, 2-locular; ovules few, arranged in a U-shape on an axile placenta; style long, stigma not dilated.
Fruit indehiscent or rarely schizocarpic, thin-walled; seeds depressed-ovoid, usually only 1 or 2 per fruit.
Distribution and occurrence: World: 8 species, endemic Australia. Australia: Qld, N.S.W.
B. citriodora F. Muell., the Lemon Ironwood, is often cultivated as an ornamental tree; its leaves are strongly lemon-scented when crushed.
Choricarpia is now included in Backhousia.
Text by Peter G. Wilson, updated 15 Apr. 2020
Taxon concept:
| | Key to the species | |
| 1 | Flowers sessile | 2 |
| Flowers pedicellate | 3 |
| 2 | Peduncles 15–30 mm long; stamens 4–8 mm long, ± glabrous | Backhousia leptopetala |
| Peduncles 4–10 mm long; stamens 2–4 mm long, tomentose
Back to 1 | Backhousia subargentea |
| 3 | Leaves <1 cm wide; lateral veins strongly ascending | Backhousia angustifolia |
| Leaves mostly >1cm wide; lateral veins spreading
Back to 1 | 4 |
| 4 | Leaves with acuminate apex, intramarginal vein very close to margin; branchlets hairy; sepals >5 mm long, yellowish and petaloid | Backhousia myrtifolia |
| Leaves with obtuse apex, intramarginal vein away from margin; branchlets not conspicuously hairy; sepals <3 mm long, not petaloid
Back to 3 | Backhousia sciadophora |
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