Boronia ternata

Boronia ternata is a shrub which grows to a height of about 2 m (7 ft) and many branches. The leaves are simple or trifoliate, the end leaflet elliptic to lance-shaped, 2–15 mm (0.08–0.6 in) long and 1–5.5 mm (0.039–0.22 in) wide. The side leaflets are 2–12 mm (0.08–0.5 in) long and 1–4 mm (0.04–0.2 in) wide and the petiole is up to 2 mm (0.08 in) long. The flowers white to pink and are usually arranged singly, sometimes in groups of up to three on a pedicel 0.5–4 mm (0.02–0.2 in) long. The four sepals are elliptic to lance-shaped or egg-shaped, 2–3.5 mm (0.079–0.14 in) long and 1–2.5 mm (0.039–0.098 in) wide. The four petals are 4–11 mm (0.16–0.43 in) long and 2–6 mm (0.08–0.2 in) long but enlarge as the fruit develops. The eight stamens alternate in length with those nearest the sepals longer than those near the petals. Flowering occurs from April to November. The fruit is a capsule 3–5.5 mm (0.12–0.22 in) long and 2–3.5 mm (0.079–0.14 in) wide[2]

Boronia ternata was first formally described in 1839 by Stephan Endlicher and the description was published in his book Novarum Stirpium Decades.[3][4] The specific epithet (ternata) is a Latin word meaning "consisting of threes".[5]

Six varieties of Boronia ternata have been described and the names are accepted by the Australian Plant Census:[2]

• Boronia ternata var. austrofoliosa Duretto;[6]
• Boronia ternata var. elongata Paul G.Wilson;[7]
• Boronia ternata var. foliosa (S.Moore) Paul G.Wilson;[8]
• Boronia ternata var. glabrifolia F.Muell.;[9]
• Boronia ternata var. promiscua Duretto;[10]
• Boronia ternata Endl. var. ternata.[11]

This boronia grows on undulating plains, hills, stony cliffs and breakaways in the Avon Wheatbelt, Coolgardie and Mallee biogeographic regions of Western Australia.[12]

Boronia ternata is listed as "not threatened" by the Government of Western Australia Department of Parks and Wildlife.[12]