1	"Phyllichnia narrow and prominently angular, occasionally flattish in older growth in C. equisetifolia but then densely pubescent on phyllichnia as well as in furrows; teeth 6–10"	2
1	"Phyllichnia broad, flat or slightly rounded or with a median groove; teeth 8–20, mostly marcescent"	3
2	"Branchlets and cones ±densely and obviously pubescent; teeth 6–8, not marcescent; cone body 10–24 mm long, 9–13 mm diam.; cone bracteoles acute; samara 6–8 mm long"	"Casuarina equisetifolia"
2	"Branchlets and cones sparsely and minutely pubescent; teeth 6–10, marcescent or not; cone body 7–14 mm long, 4–6 mm diam.; cone bracteoles broadly acute to acute; samara 3–4 mm long"	"Casuarina cunninghamiana"
3	"Teeth 12–20; phyllichnia smooth, flat or slightly rounded; cone body 7–10 mm diam.; cone bracteoles 2.0–2.5 mm wide, thin, broadly acute, with no more than 1 obvious striation; samara 3.5–5.0 mm long"	4
3	"Teeth 8–13; phyllichnia slightly wrinkled, flat or with a yellowish median groove (often masked by wax); cone body 10–16 mm diam.; cone bracteoles 3.5–4.0 mm wide, rather thick, acute, with several obvious striations; samara 5.5–10.5 mm long"	5
4	"Teeth on young permanent shoots long-recurved"	"Casuarina glauca"
4	"Teeth on young permanent shoots appressed or slightly spreading"	"Casuarina obesa"
5	"Teeth erect, appressed; articles 0.6–0.9 mm diam., somewhat waxy or occasionally sparsely pubescent"	"Casuarina cristata"
5	"Teeth spreading to recurved; articles 1–1.8 mm diam., densely and very shortly pubescent, strongly waxy"	"Casuarina pauper"