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Aesculus
See list of 2 species in this genus-
1a. Petals 5, white marked with red or yellow near the base of the blade, all but the lowermost petal with a cordate-based claw; leaves with (5–) 7 (–9) leaflets; winter buds resinous; fruit 5–6 cm wide
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1b. Petals 4, yellow to green-yellow, all with blades tapering to the claw; leaves with 5 (–7) leaflets; winter buds not resinous; fruit 3–5 cm wide
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Each photo represents one species in this genus.