Alfaropsis roxburghiana
| Alfaropsis roxburghiana | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Alfaropsis | ||||||||||||
| Ilyinsk. | ||||||||||||
| Scientific name of the species | ||||||||||||
| Alfaropsis roxburghiana | ||||||||||||
| ( Wall. ) Ilyinsk. |
Alfaropsis roxburghiana is an East Asian tree from the walnut family(Juglandaceae). In the past it was mostly placed in the genus Engelhardia .
features
Alfaropsis roxburghiana is a tree that can reach a height of 30 m . The leaves are pinnate in pairs and 1 to 25 cm long, the petiole is 1 to 8 cm long. The rachis is glabrous and has 2 to 10 leaflets . These are whole and stalked 2 to 15 mm long. Your blade is elliptical-lanceolate to long elliptical, 4.5 to 14 cm long and 1.5 to 5 cm wide. The underside is glabrous to slightly hairy, the base of the leaf is oblique, the tip is pointed to short.
The inflorescences are terminal. They are composed of male and female partial inflorescences. The male flowers are short stalked, have a round receptacle and a cup-shaped flower envelope . This consists of four similar organs, probably two bractoles and two sepals . They have 4 to 12 stamens with glabrous anthers . The pollen grains have an average diameter of 15 micrometers and have a thick exine. The female flowers are clearly short to long (7 mm) stalked. One stylus is missing, the scars are short, sit on the ovary and are divided and keeled.
The nuts are spherical, 3 to 5 mm in size and bare. The wings are also bare. The middle wing is 1.5 to 5 cm long, the two sides 0.7 to 2.7 cm. Flowering time is February to August, the fruit ripening January to December.
The number of chromosomes as with all representatives of the subfamily Engelhardioideae 2n = 32nd
distribution
Alfaropsis roxburghiana is widespread in Southeast Asia and is found in China, Cambodia, Laos, Burma, Bangladesh, Thailand, Vietnam and Indonesia. It grows in deciduous or evergreen forests on clay soils or on steep, dry slopes with a sandy soil and occurs from 200 to 1500 m above sea level.
Systematics
Alfaropsis roxburghiana (Wall.) Ilyinsk. was long known as Engelhardia roxburghiana Wall. in the genus Engelhardia , from Manning 1978 about in a monotypical section Psilocarpeae. Ilyinskaya pointed out in 1990 that the species is in terms of its characteristics between the other Engelhardia species and Alfaroa . The first phylogenetic studies by Manos and Stone in 2001 did not give any clear results. Manos et al. were able to show in 2007 that Engelhardia with the inclusion of Alfaropsis roxburghiana would be paraphyletic , so that the position as a separate genus is justified:
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supporting documents
- Anmin Lu, Donald E. Stone & LJ Grauke: Juglandaceae , in: Flora of China , Volume 4, 1999, pp. 277-285. Science Press, Beijing and Missouri Botanical Garden Press, St. Louis. (pdf, 153 kB)
- Wayne E. Manning: The Classification within the Juglandaceae . Annals of the Missouri Botanical Garden, Vol. 65, 1978, pp. 1058-1087.
- Paul S. Manos, Donald E. Stone: Evolution, Phylogeny, and Systematics of the Juglandaceae. Annals of the Missouri Botanical Garden, Volume 88, 2001, pp. 231-269.
Individual evidence
- ↑ Paul S. Manos, Pamela S. Soltis, Douglas E. Soltis, Steven R. Manchester, Sang-Hun Oh, Charles D. Bell, David L. Dilcher, Donald E. Stone: Phylogeny of Extant and Fossil Juglandaceae Inferred from the Integration of Molecular and Morphological Data Sets . Systematic Biology, Volume 56, 2007, pp. 412-430, doi : 10.1080 / 10635150701408523