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Flora of Australia Online

Casuarina equisetifolia L., Amoen. Acad. 143 (1759)
Coast Sheoak

T: Rumphius, Herbarium Amboinense 3: t. 57 (1743); holo.

Illustration: D.J.Boland et al. , Forest Trees Australia 4th edn, 105 (1984).

Monoecious tree 6–35 m high. Bark scaly, grey-brown to black. New shoots with teeth erect. Branchlets drooping, to 30 cm long; articles 5–13 mm long, 0.5–1.0 mm diam.; furrows usually densely pubescent; phyllichnia angular or occasionally flat in older growth, glabrous or pubescent; teeth 7 or 8, occasionally 6, erect (rarely spreading in New Guinea), 0.3–0.8 mm long, not marcescent. Male spikes 0.7–4 cm long, 7–11.5 whorls per cm; anther 0.6–0.8 mm long. Cones sparsely pubescent to tomentose; peduncle 3–13 mm long; cone body 10–24 mm long, 9–13 mm diam.; bracteoles acute. Samara 6–8 mm long. 

Tropical and subtropical coastlines of northern and north-eastern Australia; also from Madagascar (doubtfully native) and Burma to Vietnam, Malesia, Melanesia and Polynesia. There are 2 subspecies, intergrading on the Qld coast between Cooktown and Sarina; also in Vanuatu. 

(K.L.Wilson, L.A.S.Johnson)

Articles 0.5–0.7 mm diam.; phyllichnia prominently angular, glabrous or glabrescent; tall erect tree

subsp. equisetifolia

Articles 0.7–1 mm diam.; phyllichnia prominently angular to flat in older growth, often on the same branchlet, usually densely pubescent (at least when immature); small tree with rounded crown

subsp. incana

 

Data derived from Flora of Australia volume 3 (1989), a product of ABRS, ©Commonwealth of Australia