Sweet Chestnut (Castanea sativa) cupules. Each of these spiny cupules typically contains three chestnuts.

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Keywords: biological, biology, botanical, botany, cases, castanea, chestnut, chestnuts, close, close-, cupules, deciduous, flora, green, horticultural, horticulture, nature, plant, pods, prickly, sativa, seeds, spiny, sweet, trees