Taxon	Illustrator ⠉
	Casuarina glauca Corylus americana Casuarina equisetifolia subsp. equisetifolia Corylus cornuta subsp. cornuta Carpinus caroliniana subsp. virginiana Casuarina cunninghamiana subsp. cunninghamiana Ostrya virginiana	John Myers John Myers John Myers John Myers John Myers John Myers John Myers

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 yellowbrown 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

"thin" is not a number.