Sweetgum

Liquidambar, commonly called sweetgum^[2] (star gum in the UK),^[3] gum,^[2] redgum,^[2] satin-walnut,^[2] or American storax,^[2] is the only genus in the flowering plant family Altingiaceae and has 15 species.^[1] They were formerly often treated in Hamamelidaceae. They are native to southeast and east Asia, the eastern Mediterranean and eastern North America. They are decorative deciduous trees that are used in the wood industry and for ornamental purposes.

Both the scientific and common names refer to the sweet resinous sap (liquid amber) exuded by the trunk when cut.

Image	Scientific name	Common Name	Distribution
	Liquidambar acalycina	Chang's sweetgum	central & southern China
	Liquidambar cambodiana	Sdey	Cambodia
	Liquidambar caudata		Fujian and Zhejiang, China
	Liquidambar chinensis [ceb; sv; war]		south China to Vietnam
	Liquidambar chingii		south China to Vietnam
	Liquidambar excelsa	Rasamala [id]	Indonesia to Tibet
	Liquidambar formosana	Chinese sweetgum or Formosan sweetgum	Vietnam, Laos, China, Taiwan and Korea
	Liquidambar gracilipes [ceb; sv; war]		southeast China
	Liquidambar multinervis [ceb; sv; war]		north Guizhou, China
	Liquidambar obovata [ceb; sv; war]		Hainan, China
	Liquidambar orientalis	Oriental sweetgum or Turkish sweetgum	southwest Turkey and Rhodes, Greece
	Liquidambar poilanei [ceb; sv; war]		Vietnam
	Liquidambar siamensis [ceb; nl; sv; war]		Southeast Asia to China
	Liquidambar styraciflua	American sweetgum	eastern North America from Connecticut, USA, to Nicaragua
	'Liquidambar yunnanensis [ceb; sv; war]		southeast Yunnan, China to Vietnam

• †Liquidambar changii - Miocene (Washington state, North America)

They are all large, deciduous trees, 25–40 m (82–131 ft) tall, with palmately 3- to 7-lobed leaves arranged spirally on the stems and length of 12.5 to 20 centimetres (4.9 to 7.9 in), having a pleasant aroma when crushed. Their leaves can be many colors such as bright red, orange, yellow, and even purple.^[4] Mature bark is grayish and vertically grooved.^[4] The flowers are small, produced in a dense globular inflorescence 1–2 centimetres (0.39–0.79 in) diameter, pendulous on a 3–7 centimetres (1.2–2.8 in) stem. The fruit is a woody multiple capsule 2–4 centimetres (0.79–1.57 in) in diameter (popularly called a "gumball"), containing numerous seeds and covered in numerous prickly, woody armatures, possibly to attach to fur of animals. The woody biomass is classified as hardwood.

At higher latitudes, Liquidambars are among the last of trees to leaf out in the spring, and also among the last of trees to drop its leaves in the fall/autumn, turning multiple colors. Fall/autumn colors are most brilliant where nights are chilly, but some cultivars color well in warm climates.

Species within this genus are native to Southeast and east Asia, the western Mediterranean, and eastern North America.^[1] Countries and regions in which they occur are: Indonesia (Nusa Tenggara, Jawa, Sumatera); Malaysia (Peninsular Malaysia); Thailand; Cambodia; Vietnam; China (including Fujian, Guizhou, Hainan, Yunnan, Zhejiang}; Taiwan; Korea; Laos; Myanmar; India (including Assam); East Himalaya; Tibet; Turkey; Greece (Rhodes); Nicaragua; Honduras; El Salvador; Guatemala; Belize; Mexico; and eastern United States (from Texas to Connecticut). It is regarded as an artificially introduced species in Italy, Spain, Belgium and New York.^[1] In cultivation, they can be seen in warm temperate and subtropical climates around the world.

This genus is known in the fossil record from the Cretaceous to the Quaternary (age range: 99.7 to 0.781 million years ago).^[5] The genus was much more widespread in the Tertiary, but has disappeared from Europe due to extensive glaciation in the north and the east–west oriented Alps and Pyrenees, which have served as a blockade against southward migration. It has also disappeared from western North America due to climate change, and also from the unglaciated (but nowadays too cold) Russian Far East. There are several fossil species of Liquidambar, showing its relict status today.

The wood is used for furniture, interior finish, paper pulp, veneers and baskets of all kinds. The heartwood once was used in furniture, sometimes as imitation mahogany or Circassian walnut. It is used widely today in flake and strand boards. Sweetgum is a foodplant for various caterpillars. The American sweetgum is widely planted as an ornamental, within its natural range and elsewhere.

The hardened sap, or gum resin, excreted from the wounds of the sweetgum, for example, the American sweetgum (Liquidambar styraciflua), can be chewed on like chewing gum and has been long used for this purpose in the Southern United States.^[4] The sap was also believed to be a cure for sciatica, weakness of nerves, etc.

In Traditional Chinese medicine, lu lu tong, or "all roads open," is the hard, spiky fruit of native sweetgum species. It first appeared in Chinese medical literature in Omissions from the Materia Medica, by Chen Cangqi, in 720 AD. Bitter in taste, aromatic, and neutral in temperature, lu lu tong is claimed to promote the movement of blood and qi, water metabolism and urination, expels wind, and unblocks the channels. It is supposedly an ingredient in formulas for epigastric distention or abdominal pain, anemia, irregular or scanty menstruation, low back or knee pain and stiffness, edema with difficult urination, or nasal congestion.^[6]

In the fall/autumn, the trees drop their hard, spiky seedpods by the hundreds, which can become a serious nuisance on pavements and lawns. Some US cities have expedited permits to remove liquidambar trees.^[7]

In Louisiana folklore, a sharpened stick from this tree can be used to wound a cryptid known as The Parlangua (a hybrid of man and alligator)

• 
  Foliage of Liquidambar orientalis
• 
  Sweetgum fall foliage and seedpods, Brooklyn, New York
• 
  Sweetgum seed pods in Michigan during winter
• 
  Closeup on a sweetgum seed pod

• Media related to Liquidambar at Wikimedia Commons
• Data related to Liquidambar at Wikispecies
• "Highlights of American Chemical Society meeting in Atlanta". chemistry.org. American Chemical Society. Archived from the original on June 7, 2007.{{cite web}}: CS1 maint: unfit URL (link)
• Liquidambar styraciflua: Sweetgum at University of Florida IFAS Extension