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The scales of the bud of Horsechestnut are considered to be homologous with petioles, by analogy with other members of the same family. In the Sweet Buckeye a series can be made, exhibiting the gradual change from a scale to a compound leaf. By Asa Gray. Ivison, Blakeman, Taylor and Co., New York, 1879. Horsechestnut. I. Branch in winter state: a, leaf-scars; b, bud-scars; c, flower-scars. 2.
The calyx is bell-shaped, unequal, and lobed. The stamens and pistil can be seen. The flower-clusters do not seem to leave any mark which is distinguishable from the leaf-scar. American Elm. 1. Branch in winter state: a, leaf-scars; b, bud-scars; d, leaf-buds; e, flower-buds. 2. Branch, with staminate flower-buds expanding. 3. Same, more advanced. 4.
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