Eucalyptus protensa

Eucalyptus protensa is a species of mallee that is endemic to the southwest of Western Australia. It has smooth, dark grey or brownish bark, narrow lance-shaped adult leaves, elongated flower buds in groups of seven, yellowish green flowers and hemispherical fruit.

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Eucalyptus protensa is a mallee, sometimes a tree, that typically grows to a height of 4–10 m (13–33 ft) but does not form a lignotuber. It has smooth dark grey or brownish bark with an oily appearance. The adult leaves are the same shade of glossy dark green on both sides, narrow lance-shaped, 50–125 mm (2.0–4.9 in) long and 7–17 mm (0.28–0.67 in) wide tapering to a petiole 10–20 mm (0.39–0.79 in) long. The flower buds are arranged in leaf axils in groups of seven on an unbranched peduncle 7–13 mm (0.28–0.51 in) long, the individual buds on pedicels 3–7 mm (0.12–0.28 in) long. Mature buds are cylindrical, 29–40 mm (1.1–1.6 in) long and 6–9 mm (0.24–0.35 in) wide with a tapered, elongated operculum that is up to seven times as long as the floral cup. Flowering occurs from September to November and the flowers are yellowish green. The fruit is a woody, hemispherical to shortened spherical capsule 6–8 mm (0.24–0.31 in) long and 8–13 mm (0.31–0.51 in) wide with the valved protruding strongly.