The genus Aesculus (/ˈɛskjʊləs/ or /ˈaɪskjʊləs/), with species called buckeye and horse chestnut, comprises 13–19 species of flowering plants in the family Sapindaceae. They are trees and shrubs native to the temperate Northern Hemisphere, with six species native to North America and seven to 13 species native to Eurasia. Several hybrids occur. Aesculus exhibits a classical Arcto-Tertiary distribution. Aesculus species have stout shoots with resinous, often sticky, buds, with opposite, palmately divided leaves, often very large—to 65 cm (26 in) across in the Japanese horse chestnut, A. turbinata. Species are deciduous or evergreen. Flowers are showy, insect- or bird-pollinated, with four or five petals fused into a lobed corolla tube, arranged in a panicle inflorescence. Flowering starts after 80–110 growing degree days. The fruit matures to a capsule 2–5 cm (1–2 in) diameter, usually globose, containing one to three seeds (often erroneously called a nut) per capsule. Capsules containing more than one seed result in flatness on one side of the seeds. The point of attachment of the seed in the capsule (hilum) shows as a large, circular, whitish scar. (Source: Wikipedia.org, CC BY-SA)