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Concept
Liriodendron
Summary
Liriodendron (ˌlaɪriəˈdɛndrən,ˌlɪr-,-ioʊ-) is a genus of two species of characteristically large trees, deciduous over most of their populations, in the magnolia family (Magnoliaceae).
These trees are widely known by the common name tulip tree or tuliptree for their large flowers superficially resembling tulips. It is sometimes referred to as tulip poplar or yellow poplar, and the wood simply as "poplar", although not closely related to the true poplars. Other common names include canoewood, saddle-leaf tree, and white wood.
The two extant species are Liriodendron tulipifera, native to eastern North America, and Liriodendron chinense, native to China and Vietnam. Both species often grow to great size, the North American species may reach as much as in height. The North American species is commonly used horticulturally, the Chinese species is increasing in cultivation, and hybrids have been produced between these two allopatrically distributed species.
Various extinct species of Liriodendron have been described from the fossil record.
Liriodendron trees are easily recognized by their leaves, which are distinctive, having four lobes in most cases and a cross-cut notched or straight apex. Leaf size varies from 8–22 cm long and 6–25 cm wide. They are deciduous in the vast majority of cases for both species; however, each species has a semi-evergreen variety at the southern limit of its range in Florida and Yunnan respectively. The tulip tree is often a large tree, 18–60 m high and 60–120 cm in diameter. The stoutest well-authenticated Tulip tree was the Liberty Tree in Maryland which was in diameter. It died in 1999. The tree is known to reach the height of , in groves where they compete for sunlight, somewhat less if growing in an open field. Its trunk is usually columnar, with a long, branch-free bole forming a compact, rather than open, conical crown of slender branches. It has deep roots that spread widely.
Leaves are slightly larger in L. chinense, compared to L. tulipifera, but with considerable overlap between the species; the petiole is 4–18 cm long.
Official source
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