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Aesculus hippocastanum
''Aesculus hippocastanum'' is a large deciduous, synoecious〔https://bioweb.uwlax.edu/bio203/s2013/phillips_reb2/reproduction.htm〕 tree, commonly known as horse-chestnut or conker tree.
==Description==
''Aesculus hippocastanum'' grows to tall, with a domed crown of stout branches; on old trees the outer branches often pendulous with curled-up tips. The leaves are opposite and palmately compound, with 5–7 leaflets; each leaflet is 13–30 cm long, making the whole leaf up to 60 cm across, with a 7–20 cm petiole. The leaf scars left on twigs after the leaves have fallen have a distinctive horseshoe shape, complete with seven "nails". The flowers are usually white with a small red spot; they are produced in spring in erect panicles 10–30 cm tall with about 20–50 flowers on each panicle. Usually only 1–5 fruit develop on each panicle; the shell is a green, spiky capsule containing one (rarely two or three) nut-like seeds called conkers or horse-chestnuts. Each conker is 2–4 cm diameter, glossy nut-brown with a whitish scar at the base.〔Rushforth, K. (1999). ''Trees of Britain and Europe''. Collins ISBN 0-00-220013-9.〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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