Casuarina

Linnaeus

Amoen. Acad. 4: 143. 1759.

Common names: She-oak
Etymology: Neo-Latin casuarius, cassowary, from resemblance of drooping branchlets to feathers of the cassowary
Treatment appears in FNA Volume 3.
 TaxonIllustrator 
FNA03 P102 Carpinus Ostrya Corylus Causurina pg 537.jpegCasuarina 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.

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.

... more about "Casuarina"
Karen L. Wilson +
Linnaeus +
toothlike +
expanded +
scale-like +  and toothlike +
deciduous +  and persistent +
photosynthetic +
distinguished +
reduced +
She-oak +
Almost throughout range of family +
Neo-Latin casuarius, cassowary, from resemblance of drooping branchlets to feathers of the cassowary +
pistillate +  and staminate +
compressed +
short;elongate +
conelike +  and cylindric +
reduced;small +
2 +  and additional +
2-carpellate +  and compound +
reduced +
Amoen. Acad. +
grayish +  and pale yellowbrown +
terete +  and elongate +
deciduous +
scale-like +
size +  and shape +
Casuarina +
Casuarinaceae +
alternating +