Young persistent branchlets distinguished from deciduous branchlets by shorter segments and differences in shape or size of leaves; furrows deep and closed, concealing stomates. Infructescences pedunculate, pubescent at least when immature; bracts thin in exposed portion, not vertically expanded; bracteoles ± protruding from surface of infructescence, never greatly thickened, always lacking dorsal protuberance. Samaras pale yellow-brown or grayish, dull, glabrous. x = 9.

Distribution

Almost throughout range of family.

Discussion

Species 17 (3 in the flora).

Hybrids are frequent in cultivation; in the flora, hybrids are known between all combinations of the three species.

Selected References

None.

Lower Taxa

Casuarina cunninghamiana, Casuarina equisetifolia, Casuarina glauca

Key

1	Longitudinal ridges of branchlets flat or slightly rounded-convex; leaf teeth 12–17; teeth on young permanent shoots long-recurved.	Casuarina glauca
1	Longitudinal ridges of branchlets prominently angular; leaf teeth (6–)7–10; teeth on young permanent shoots erect to spreading.	> 2
2	Branchlets ± densely and obviously pubescent; teeth (6–)7–8, not marcescent; infructescence body 12–24 × 9–11 mm, bracteoles acute; samaras 6–8mm.	Casuarina equisetifolia subsp. equisetifolia
2	Branchlets sparsely and minutely pubescent; teeth 8–10, marcescent; infructescence body 7–14 × 4–6 mm, bracteoles broad-acute; samaras 3–4 mm.	Casuarina cunninghamiana subsp. cunninghamiana