1	"Petioles winged"	2
1	"Petioles without wings"	3
2	"Mature fruits green or greenish-yellow; leaf lamina 40-85 mm long"	"Citrus x aurantifolia"
2	"Mature fruits bright yellow; leaf lamina 70-135 mm long"	"Citrus x limon"
3	"Larger leaves with lamina 3.5-8 mm wide, 4-8 times longer than broad, concolorous, lateral veins obscure; petiole indistinct, merging into lamina; fruits 9-15 mm long"	"Citrus glauca"
3	"Larger leaves with lamina (6-)8-70 mm wide, 1.1-3.4 times longer than broad, discolorous, lateral veins readily visible; petiole distinct from lamina; fruits 35-100 mm long"	4
4	"Larger leaves with lamina 120-180 mm long, lateral veins at 60-70 degrees to midrib; spines (when present) usually 2 at each node, occasionally 1"	"Citrus inodora"
4	"Larger leaves with lamina 12-56 mm long, lateral veins at 30-45 degrees to midrib; spines (when present) always 1 at each node"	5
5	"Fruits globose; lamina margins usually entire, sometimes crenulate"	"Citrus australis"
5	"Fruits narrowly to broadly ellipsoidal, or cylindrical; lamina margins crenulate"	6
6	"Fruits 50-100 mm long, at maturity green, yellow, red, purple or black; lamina 12-24 mm long; branchlet hairs erect"	"Citrus australasica"
6	"Fruits 50-70 mm long, at maturity green; lamina 16-48 mm long; branchlet hairs antrorse"	"Citrus garrawayi"