Liriodendron

Source: Wikipedia, the free encyclopedia.

Liriodendron
Temporal range: 99.7–0 
Ma
Late Cretaceous - present [1]
Liriodendron tulipifera foliage and flower.
Morton Arboretum acc. 500-67*21
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Magnoliids
Order: Magnoliales
Family: Magnoliaceae
Genus: Liriodendron
L.
Species

Liriodendron (

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

allopatrically
distributed species.

Various extinct species of Liriodendron have been described from the fossil record.

Liriodendron chinense twig with flowers. Notice that the orange pigment characteristic of L. tulipifera petals is absent.

Description

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.[5] 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 21.5 feet (6.6 meters) in circumference.[6] It died in 1999. The tree is known to reach the height of 191.8 feet (58.5 meters),[7] 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.[8]

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. Leaves on young trees tend to be more deeply lobed and larger in size than those on mature trees. In autumn, the leaves turn yellow, or brown and yellow. Both species grow rapidly in rich, moist soils of temperate climates. They hybridize easily.

gynaecium; the stamens fall off, and the pistils become the samaras. The fruit
is a cone-like aggregate of samaras 4–9 cm long, each of which has a roughly tetrahedral seed with one edge attached to the central conical spike and the other edge attached to the wing.

Tulip tree bark
Tulip tree flower
Tuliptrees can be very large. This 130-footer in Pennsylvania with a 5-foot trunk dwarfs a group of mature oaks and maples.

Distribution

Liriodendron trees are also easily recognized by their general shape, with the higher branches sweeping together in one direction, and they are also recognizable by their height, as the taller ones usually protrude above the canopy of oaks, maples, and other trees—more markedly with the American species. Appalachian cove forests often contain several tulip trees of height and girth not seen in other species of eastern hardwoods.

In the Appalachian cove forests, trees 150 to 165 ft in height are common, and trees from 166 to nearly 180 ft are also found. More Liriodendron over 170 ft in height have been measured by the Eastern Native Tree Society than for any other eastern species. The current tallest tulip tree on record has reached 191.9 ft, the tallest native

clinometers/hypsometers
when measuring height.

Maximum circumferences for the species are between 24 and 30 ft at breast height, although a few historical specimens may have been slightly larger. The Great Smoky Mountains National Park has the greatest population of tulip trees 20 ft and over in circumference. The largest-volume tulip tree known anywhere is the Sag Branch Giant, which has a trunk and limb volume approaching 4,000 cu ft (110 m3).

Fossils

Liriodendrons have been reported as fossils from the late

Lycopodiophyta common as Paleozoic coal-age
fossils).

Liriodendron giganteum (a), an extinct Late Cretaceous species.

Cultivation and use

Tulip trees serving an ornamental role in Vancouver.

Liriodendron trees prefer a

acidic soil. Propagation is by seed or grafting. Plants grown from seed may take more than eight years to flower. Grafted plants flower depending on the age of the scion
plant.

The wood of the North American species (called poplar or tulipwood) is fine grained and stable. It is easy to work and commonly used for cabinet and furniture framing, i.e. internal structural members and subsurfaces for veneering. Additionally, much inexpensive furniture, described for sales purposes simply as "hardwood", is in fact primarily stained poplar. In the literature of American furniture manufacturers from the first half of the 20th century, it is often referred to as "gum wood". The wood is only moderately rot-resistant and is not commonly used in shipbuilding, but has found some recent use in light-craft construction. The wood is readily available, and when air dried, has a density around 24 lb/cu ft (0.38 g/cm3).

The name canoewood probably refers to the tree's use for construction of dugout canoes by eastern Native Americans, for which its fine grain and large trunk size is eminently suited.

Tulip tree leaves are eaten by the

eastern tiger swallowtail
(Papilio glaucus).

Species and cultivars

Liriodendron at Hingham Center Cemetery, Hingham, Massachusetts
Bud of a Liriodendron hybrid
  • Liriodendron chinense
  • Liriodendron tulipifera
    • 'Ardis' is a small-leaf, compact cultivar
    • 'Aureomarginatum' is variegated with yellow-margined leaves
    • 'Fastigiatum' grows with an erect or columnar habit (
      fastigiate
      )
    • 'Florida' strain — a fast-growing early bloomer, leaves have round lobes
    • 'Glen Gold' bears yellow-gold colored leaves
    • 'Mediopictum' is a variegated cultivar with gold-centered leaves
  • 'Chapel Hill' and 'Doc Deforce's Delight' are hybrids of the above two species

References

  1. ^ ""Liriodendron"". Fossilworks.
  2. ^ "Liriodendron". Lexico UK English Dictionary. Oxford University Press. Archived from the original on 2020-03-22.
  3. ^ Sunset Western Garden Book, 1995:606–607.
  4. ^ "The thickest, tallest, and oldest tulip trees (Liriodendron tulipifera)".
  5. .
  6. ^ <anonymous> (February 21, 2004). "Middleton Oak SC and Sag Branch Tulip GSMNP Project". Retrieved April 24, 2008.
  7. ^ "Landmark Trees". May 6, 2011. Retrieved December 20, 2011.
  8. ^ Michigan Trees
  9. ^ "Fork Ridge Tuliptree- new eastern height record!!!". Eastern Native Tree Society, Will Blozan. Retrieved Apr 29, 2011.

External links