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1. Casuarina Linnaeus, Amoen. Acad. 4: 143. 1759.
She-oak [Neo-Latin casuarius, cassowary, from resemblance of drooping branchlets to feathers of the cassowary]
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.
Species 17 (3 in the flora): almost throughout range of family.
Hybrids are frequent in cultivation; in the flora, hybrids are known between all combinations of the three species.
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| 1 |
Longitudinal ridges of branchlets flat or slightly rounded-convex; leaf teeth 12–17; teeth on young permanent shoots long-recurved. |
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3 Casuarina glauca |
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Longitudinal ridges of branchlets prominently angular; leaf teeth (6–)7–10; teeth on young permanent shoots erect to spreading. |
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(2) |
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| 2 (1) |
Branchlets ± densely and obviously pubescent; teeth (6–)7–8, not marcescent; infructescence body 12–24 × 9–11 mm, bracteoles acute; samaras 6–8mm. |
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1a subsp. equisetifolia |
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Branchlets sparsely and minutely pubescent; teeth 8–10, marcescent; infructescence body 7–14 × 4–6 mm, bracteoles broad-acute; samaras 3–4 mm. |
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2a subsp. cunninghamiana |
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Lower Taxa
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