Fl. Austral. 2: 500. 1864.
Trees or shrubs to 10 m; branches without thorns. Leaves persistent or tardily deciduous (then turning red and plants briefly leafless); petiole 8–20 mm; blade obovate, 4.2–19.5 × 2–7.5 cm, base attenuate to cuneate, apex short-acuminate or mucronate, acute, obtuse, or rounded, surfaces glabrate to sparsely pubescent abaxially, midvein and secondary veins densely to sparsely pubescent or glabrous, when glabrous, elongate hairs usually present in axils, forming domatia, usually with nectar glands near base, glabrous or glabrate to sparsely pubescent adaxially, midvein densely to sparsely pubescent, at least basally; hair-tuft domatia usually present at junction of secondary veins and midvein, these sometimes poorly developed. Spikes 6.5–15 cm, with bisexual flowers proximally, staminate flowers distally. Flowers 4- or 5-merous, bisexual and staminate; free portion of hypanthium 1–2 mm; sepals 1.5–3 mm; stamens 2–4.3 mm; style 3.5–4 mm. Drupes green or red becoming blue or blue-black, slightly flattened, ovoid to ellipsoid, 12–20 × 8–15 mm, sparsely pubescent or glabrous; with 2 poorly developed and rounded ridges; hypanthium and calyx usually deciduous in age. 2n = 36.
Phenology: Flowering spring, summer.
Habitat: Mangrove swamps, disturbed hammocks, other disturbed habitats.
Elevation: 0–10 m.
Introduced; Fla., ne Australia.
Terminalia muelleri is occasionally cultivated as an ornamental tree in southern and central Florida; it has naturalized coastally from Palm Beach County in the east to Manatee County in the west, and extending southward on the peninsula.
Terminalia muelleri is a triploid; polyploidy is common in the genus (D. Ohri 1996; C. A. Stace 2007).