Acacia xanthophloea

Fever tree
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Fabales
Family: Fabaceae
Genus: Acacia
Species: A. xanthophloea
Binomial name
Acacia xanthophloea
Benth.

Acacia xanthophloea is a tree in the Fabaceae family and is commonly known in English as the Fever Tree (local East African names include Olerai, Kimwea, Murera, and Mwelele). This species of Acacia is native to eastern and southern Africa. It can be found in Botswana, Kenya, Malawi, Mozambique, Somalia, South Africa, Swaziland, Tanzania, Zambia and Zimbabwe. It has also become a landscape tree in other warm climates, outside of its natural range.

Contents

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Description

The trees grow to a height of 15–25 m. The characteristic bark is smooth, powdery and greenish-yellow in colour. It is one of the few trees where photosynthesis takes place in the bark. Straight, white spines grow from the branch nodes in pairs. The leaves are twice compound, with small leaflets (8 x 2 mm). The flowers are produced in scented pale cream spherical inflorescences, clustered at the nodes and towards the ends of the branches.

Fever trees are fast-growing and short-lived. They have a tendency to occur as single-aged stands, and are subject to stand-level diebacks that have been variously attributed to elephants, water tables, and synchronous senescence.[1][2][3][4]

Etymology

The name xanthophloea is derived from Greek and means "yellow bark". The common name, Fever tree, comes from its tendency to grow in swampy areas: early European settlers in the region noted that malarial fever was contracted in areas with these trees, which we now know is because malarial fever was spread by mosquitos living in the swampy areas that often support this tree species.[5]

In popular culture

These trees are immortalized by Rudyard Kipling in one of his Just So Stories, The Elephant's Child, wherein he repeatedly refers to "the great grey-green, greasy Limpopo River, all set about with fever-trees."[6]

Gallery

A Fever tree planted outside of its natural range at Ilanda Wilds  
Planted at Umdoni Bird Sanctuary  
Foliage and branches  
Leaves  
Branches  
A spider on the stem  

Notes and references

  1. ^ Western, D. & C. Van Praet (1973). "Cyclical changes in the habitat and climate of an East African ecosystem". Nature 241 (5385): 104–106. doi:10.1038/241104a0. 
  2. ^ Young, T.P. and W.K. Lindsay (1988). "Role of even-aged population structure in the disappearance of Acacia xanthophloea woodlands". African Journal of Ecology 26: 69–72. doi:10.1111/j.1365-2028.1988.tb01130.x. 
  3. ^ Ruess, R.W. and F.L. Walter (1990). "The impact of large herbivores on the Seronera woodlands, Serengeti National Park, Tanzania". African Journal of Ecology 28 (4): 259–275. doi:10.1111/j.1365-2028.1990.tb01161.x. 
  4. ^ Mills, A.J. (2006). "The role of salinity and sodicity in the dieback of Acacia xanthophloea in Ngorongoro Caldera, Tanzania". African Journal of Ecology 44: 61–71. doi:10.1111/j.1365-2028.2006.00616.x. 
  5. ^ Acacia xanthophloea entry at PlantZAfrica.com
  6. ^ "The Elephant's Child

Bibliography