Tetradium

taxobox
name = "Tetradium"

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image_caption = "Tetradium daniellii" T. G. Hartley
regnum = Plantae
unranked_divisio = Angiosperms
unranked_classis = Eudicots
unranked_ordo = Rosids
ordo = Sapindales
familia = Rutaceae
genus = "Tetradium"
subdivision_ranks = Species
subdivision = Nine species including:
*"Tetradium austrosinense" - Korean Euodia
*"Tetradium calcicola"
*"Tetradium danielii" - Korean Euodia
*"Tetradium fraxinifolium" (Hook.) T. G. Hartley
*"Tetradium glabrifolium" (Champ. ex Benth.) T. G. Hartley
*"Tetradium ruticarpum"
*"Tetradium trichotomum"|

"Tetradium" is a genus of nine species of trees in the family Rutaceae, occurring in temperate to tropical east Asia. In older books, the genus was often included in the related genus "Euodia" (orthographic error, "Evodia"), but that genus is now restricted to tropical species (1). In cultivation in English-speaking countries, they are known as Euodia, Evodia, or Bee bee tree.

They are attractive trees with deciduous glossy pinnate leaves. "Tetradium daniellii" (syn. "T. hupehensis") develops a smooth gray bark that resembles that of a beech tree and grows to a height of 20 metres. The leaves resemble the foliage of an ash tree and are a glossy dark green in summer. In fall there is little color change and leaves tend to drop green to yellow-green. The tree is covered in late July and August with masses of large flat white to gray cluster of small white flowers, particularly valued when few other tree-size plants are flowering. It attracts large numbers of bees and is sought after by beekeepers as a source of late summer honey. The flowers produce clusters of seed that is present from late August through November. The seeds start as bright red capsules that when fully ripe open to expose shiny black buckshot seed as Autumn progresses. The small, red-to-black berries are popular with many birds.

"Tetradium" species are used as food plants by the larvae of some Lepidoptera species including "Aenetus scotti" and "Endoclita damor".

The genus is also closely related to "Melicope" and is sometimes included within it.

ee also

*(1) [http://flora.huh.harvard.edu/china/PDF/PDF11/Tetradium.pdf Flora of China: "Tetradium"]
* [http://www.salisbury.edu/arboretum/Evodia/EvDa/EvDaHM.html Evodia] Arboretum Salisbury University
* [http://www.garden-shopping.de/shop/customer/product.php?productid=200058&cat=&page= Euodia hupehensis] German website with nice pictures of bees on "T. daniellii" (as "Euodia hupehensis").