Description: Shrubs.
Leaves opposite, margins entire, crenate or finely ciliate-toothed, oil dots conspicuous on lower surface, scattered or in 2 parallel rows; shortly petiolate.
Inflorescences axillary, often with 2 flowers arising separately in leaf axils. Flowers 5-merous, white to deep pink. Calyx lobes simple, persistent in fruit. Petals free. Stamens 14–18; filaments straight; anthers versatile, dehiscing by long parallel slits, gland-tipped. Ovary half-inferior, 3-locular; ovules 8–13 per loculus, arranged in 2 or 3 rows on a peltate placenta; stigma capitate.
Fruit a loculicidal capsule; seeds reniform, not angular, not arillate.
Distribution and occurrence: World: 7 spp., endemic Aust., Qld, N.S.W.
Text by Peter G. Wilson
Taxon concept:
| | Key to the species | |
| 1 | Apex of leaves truncate, recurved; calyx lobes deltate; petals 2–2.4 mm long; restricted to the Nowra area. | Triplarina nowraensis |
| Apex of leaves obtuse, flat; calyx lobes ± semicircular; petals 1.5–1.7 mm long; Nymboida and Tabulum districts, and possibly Parramatta. | Triplarina imbricata |
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