From The Collaborative International Dictionary of English v.0.44 [gcide]:
Plane \Plane\, noun [F., fr. L. platanus, Gr. ?, fr. ? broad; -- so called on account of its broad leaves and spreading form. See {Place}, and cf. {Platane}, {Plantain} the tree.] (Bot.) Any tree of the genus {Platanus}.
Note: The Oriental plane ({Platanus orientalis}) is a native of Asia. It rises with a straight, smooth, branching stem to a great height, with palmated leaves, and long pendulous peduncles, sustaining several heads of small close-sitting flowers. The seeds are downy, and collected into round, rough, hard balls. The Occidental plane ({Platanus occidentalis}), which grows to a great height, is a native of North America, where it is popularly called {sycamore}, {buttonwood}, and {buttonball}, names also applied to the California species ({Platanus racemosa}).
From The Collaborative International Dictionary of English v.0.44 [gcide]:
Buttonwood \But"ton*wood'\, noun (Bot.) The {Platanus occidentalis}, or American plane tree, a large tree, producing rough balls, from which it is named; -- called also {buttonball tree}, and, in some parts of the United States, {sycamore}. The California buttonwood is {Platanus racemosa}.
From WordNet (r) 2.0 [wn]:
noun
1: very large spreading plane tree of eastern and central North America to Mexico [syn: {American sycamore}, {American plane}, {Platanus occidentalis}]
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