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The beautiful and interesting species described below is the only member of its genus, and one of the few hardy members of the Sapindaceae. Leaves odd-pinnate, alternate. Flowers regular, unusually large for this family. Sepals and petals five. Stamens eight. Stigma three-lobed. Fruit a leathery, thick-walled capsule, containing several large seeds. The generic name (from the Greek words for yellow and horn) refers to the long horn-like appendages of the floral disk.