Eucalyptus sessilis

Eucalyptus sessilis, commonly known as Finke River mallee, red bud mallee or river mallee, is a species of mallee that is native to the Northern Territory and central areas along the border of Western Australia. It has smooth bark, sometimes with ribbon of old bark near the base, lance-shaped to egg-shaped or elliptical adult leaves, flower buds in groups of seven, creamy yellow flowers and hemispherical fruit.

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Eucalyptus sessilis is a mallee with a spreading, straggly habit, that typically grows to a height of 2–5 m (6 ft 7 in – 16 ft 5 in), and forms a lignotuber. Its bark is smooth and grey and is shed in long strips or ribbons that sometimes accumulate at the base of the stems. Young plants and coppice regrowth have egg-shaped to broadly lance-shaped leaves that are 120–160 mm (4.7–6.3 in) long and 50–60 mm (2.0–2.4 in) wide. Adult leaves are arranged alternately, the same dull and green to grey-green colour on both sides, 60–150 mm (2.4–5.9 in) long and 17–62 mm (0.67–2.44 in) wide on a petiole 17–42 mm (0.67–1.65 in) long. The flower buds are arranged in leaf axils in groups of seven on a stout, unbranched peduncle 4–10 mm (0.16–0.39 in) long, the individual buds sessile or on pedicels up to 4 mm (0.16 in) long. Mature buds are claret-coloured, oval to spherical, 18–25 mm (0.71–0.98 in) long and 10–16 mm (0.39–0.63 in) wide, with longitudinal ribs and a beaked operculum. Flowering occurs between April and July and the flowers are yellow-cream in colour. The fruit is a woody, usually sessile, hemispherical capsule 6–13 mm (0.24–0.51 in) long and 14–23 mm (0.55–0.91 in) wide with a raised disc and four protruding valves. The seeds are grey-brown to blackish, 2–4 mm (0.079–0.157 in) long and a flattened pyramid to cubic shape.