The horse chestnut and the chestnut tree are two entirely different trees. Although they both bear the name "chestnut," they are not relatedl. The horse chestnut is cultivated mainly for its ornamental value; its fruit is inedible. The fruit of the chestnut tree, however, may be eaten. There are other differences between the trees.
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The leaves of the horse chestnut are palmately compound--with five leaflets radiating from the centre of the stalk--and have fine-toothed margins. They vary in size, from 4 to 10 inches long. Chestnut leaves are single--only one per stem--and are narrow and elliptic in shape. They are 5 to 8 inches long. Chestnut leaves have sharply toothed margins.
The horse chestnut is covered with thick buds during the winter months. The buds are terminal (one bud at the end of a stem). They have 14 scales and are covered by a sticky substance which seals them for protection.The buds of the chestnut are spaced along the stem in an alternate arrangement. They are smooth and brown and asymmetrical in shape.
The horse chestnut twigs form scars in the shape of horseshoes when the tree loses a leaf. The small branches are covered with these marks. The twigs of the chestnut, however, do not bear these scars, and are smooth.
A chestnut tree has "burs" (which contain and protect the fruit) the size of a tennis ball. They are spiny, like a porcupine. The burs contain three chestnuts each. The horse chestnut also has a burr. It is also spiny, but there are fewer spines. A horse chestnut burr only contains one fruit, and the fruit is not edible.
The horse chestnut produces a shiny brown nut which is inedible. The nut bears a pale brown scar where it was attached to the inside of the burr. The chestnut tree produces a highly edible nut. It is used as an ingredient in stuffing for turkey or pheasant, or simply roasted.
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