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Trochodendron aralioides, treetop

Trochodendron aralioides , treetop

Department : Vascular plants (tracheophyta)
Subdivision : Seed plants (Spermatophytina)
Class : Bedecktsamer (Magnoliopsida)
Order : Trochodendrales
Family : Trochodendraceae
Scientific name of the  order
Scientific name of the  family

The Trochodendraceae are the only family in the order of the Trochodendrales . There are only two monotypical genera and therefore only two species in this family.


Illustration of Trochodendron aralioides
Terminal inflorescence of Trochodendron aralioides

The two species grow as evergreen trees or shrubs and reach heights of up to 15 meters. The wood of the Trochodendraceae has no tracheas . The bark of the branches is gray-brown. Stipules are present.

The flowers stand together in inflorescences. The hermaphroditic flowers are very different in the two genera; in Tetracentron they are fourfold. There are only four ( Tetracentron ) or none to five ( Trochodendron ) bracts . In Tetracentron there are four and in Trochodendron many more or less spirally arranged stamens . In Tetracentron there are 4 and in Trochodendron mostly 6 to 11 (4 to 17) upper carpels which are only laterally fused. Collective fruits are formed from 4 to 17 follicle fruits .

Systematics and distribution

The Trochodendraceae are the only family of the order Trochodendrales. These are relatively basal within the nuclear eudicotyledons.

The family contains only two monotypical genera:

  • Tetracentron olive. :
    • Tetracentron sinense olive. : It is a species of tree from central and western China (in the provinces: southern Gansu, Guizhou, southwestern Henan, western Hubei, northwestern and southwestern Hunan, southern Shaanxi, Sichuan, southern and southeastern Xizang and Yunnan). Butnatural stocks have also been discoveredin northern Myanmar (Burma), eastern Nepal , Bhutan , northeast India and northern Vietnam . It grows along streams and on the edges of laurel forests or semi-evergreen forests at altitudes between 1100 and 3500 meters.
  • Trochodendron Siebold & Zucc. :


Individual evidence

  1. Angiosperm Phylogeny Group : An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants: APG III. In: Botanical Journal of the Linnean Society. Vol. 161, No. 2, 2009, ISSN  0024-4074 , pp. 105-121, doi : 10.1111 / j.1095-8339.2009.00996.x .

Web links

Commons : Trochodendraceae  - collection of images, videos, and audio files