Allocasuarina hystricosa

Allocasuarina hystricosa is a species of flowering plant in the family Casuarinaceae and is endemic to the south of Western Australia. It is a dioecious shrub with more or less erect branchlets, the leaves reduced to scales in whorls of ten to twelve, the fruiting cones 13–30 mm (0.51–1.18 in) long containing winged seeds (samaras) 4.5–9 mm (0.18–0.35 in) long.

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Allocasuarina hystricosa is a dioecious shrub that typically grows to a height of up to 3 m (9.8 ft). Its branchlets are more or less erect, up to 300 mm (12 in) long and slightly scaly, the leaves reduced to erect, scale-like teeth 0.8–1.5 mm (0.031–0.059 in) long, arranged in whorls of ten to twelve around the branchlets. The sections of branchlet between the leaf whorls (the "articles") are mostly 15–35 mm (0.59–1.38 in) long and 0.9–1.3 mm (0.035–0.051 in) wide. Male flowers are arranged in sessile spikes 4–15 mm (0.16–0.59 in) long on older branchlets, the anthers 0.6–0.8 mm (0.024–0.031 in) long. Female cones are sessile and usually oblong to elliptic in outline, 10–30 mm (0.39–1.18 in) long and 13–18 mm (0.51–0.71 in) wide when mature. Male flowers have been observed in February and female flowers in February, April, June and December, and the samaras are reddish-brown to brownish-black and 4.5–9 mm (0.18–0.35 in) long. This sheoak is similar to A. scleroclada, but that species has drooping branchlets and slightly longer articles and teeth.