Dallachya vitiensis

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Dallachya vitiensis
Systematics
Eurosiden I
Order : Rose-like (rosales)
Family : Buckthorn Family (Rhamnaceae)
Tribe : Rhamneae
Genre : Dallachya
Type : Dallachya vitiensis
Scientific name of the  genus
Dallachya
F. Garbage.
Scientific name of the  species
Dallachya vitiensis
( Benth. ) F. Muell.

Dallachya vitiensis is the only species in the genus Dallachya from the family of Buckthorn family (Rhamnaceae). The species usually grows as a liana in rainforests and forms stone fruits . The distribution area is in Australia, New Guinea and the Pacific region.

description

Dallachya vitiensis usually grows as a liana , less often as a shrub or as a small tree. The leaves are alternate. The leaf blade is 4 to 11.5 inches long and 1.5 to 5 inches wide. The petiole is 0.4 to 1.4 inches long and narrowly grooved on the top. The stipules are triangular and about 1 to 2.5 inches long. Six or seven side veins are formed. The flowers are arranged in sessile, axillary, umbel-like cymes . They grow on a 4 to 7 millimeter long peduncle and have a diameter of 3 to 5 millimeters. The flower cup is short, the discus fused with the flower cup. The calyx lobes are about 2 millimeters long and keeled on the inside. The petals are about 1 to 1.5 millimeters long. The stamens are 1 to 1.5 millimeters long, the anthers about 0.6 millimeters. The ovary is constantly above, the stylus about 1.2 millimeters long. The fruits are single-core stone fruits and grow individually in the leaf axils. They are about 8 millimeters long with a diameter of about 5 millimeters. The calyx is mostly retained at the base of the fruit. The pericarp is soft and watery when ripe, the endocarp is hard, leathery and usually single-fan.

distribution

The natural range is in the north of Australia, in Papua New Guinea and in the Pacific area. There it grows in the monsoon forest and rainforest both in the lowlands and at higher altitudes.

Systematics and research history

Dallachya vitiensis is the only species of the therefore monotypical genus Dallachya from the family of buckthorn plants (Rhamnaceae), in which it is assigned to the tribe Rhamneae . George Bentham recorded the species in Flora Australiensis in 1863 as Rhamnus vitiensis Benth. ( Basionym ) first described and thus assigned to the genus buckthorn ( Rhamnus ). Ferdinand von Mueller placed the species in 1875 as Dallachya vitiensis in the newly created genus Dallachya . The status as a separate genus is not recognized by some authors; Albert Charles Smith , for example, classified the species as Rhamnella vitiensis (Benth.) ACSm in 1943. of the genus Rhamnella .

Individual evidence

  1. ↑ a b c D. Medan, C. Schiarend: Rhamnaceae in Klaus Kubitzki: The Families and Genera of Vascular Plants , Volume VI, pp. 328, 329
  2. ↑ a b Dallachya vitiensis. In: Australian Tropic Rainforest Plants. Retrieved November 29, 2014 .
  3. ↑ Rhamnus vitiensis. In: The International Plant Name Index. Retrieved November 26, 2014 .
  4. ↑ Dallachya vitiensis. In: The International Plant Name Index. Retrieved November 26, 2014 .
  5. ↑ Dallachya. In: The International Plant Name Index. Retrieved November 26, 2014 .
  6. ^ Ferdinand von Mueller: Dallachya . In: Fragmenta Phytographiae Australiae . tape 9 . Cambridge, MA 1875, p. 140 ( online at the Biodiversity Heritage Library [accessed November 29, 2014]).
  7. ↑ Rhamnella vitiensis. In: The International Plant Name Index. Retrieved November 29, 2014 .

literature

  • Klaus Kubitzki (Ed.): The Families and Genera of Vascular Plants . Volume 6: Flowering Plants, Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales . Springer, Berlin / Heidelberg / New York 2004, ISBN 3-540-06512-1 , pp. 333 (English).

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