Cyclocarya paliurus
| Cyclocarya paliurus | ||||||||||||
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Cyclocarya paliurus |
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Cyclocarya | ||||||||||||
| Ilyinsk. | ||||||||||||
| Scientific name of the species | ||||||||||||
| Cyclocarya paliurus | ||||||||||||
| ( Batal. ) Ilyinsk. |
Cyclocarya paliurus is a species of tree from the walnut family(Juglandaceae). It is native to China and the only member of the genus Cyclocarya .
features
Cyclocarya paliurus is a deciduous tree up to 30 m high. The wood is somewhat ring-pored. The branches have a chambered Mark . The terminal buds are elongated and bare.
The leaves are 20 to 25 cm long, pinnate unpaired and have a 2.5 to 5 cm long petiole . The leaves are hairy, less often balding, the rachis is hairy. The leaf consists of 7 to 9 (rarely 5 to 11) leaflets. The lateral leaflets are sessile or stalked a maximum of 2 mm long. Your blade is elliptical-oval to broadly lanceolate, 5 to 14 cm long and 2 to 6 cm wide. The underside is hairy along the midrib and the next order side ribs. The base of the leaflet is asymmetrical, broadly wedge-shaped to rounded, the tip blunt to pointed. The terminal leaflet is stalked 1 to 15 mm long.
The plants are monoecious . The inflorescences are pendulous. Male and female inflorescences are separate. The male ears are in groups of 3 to 5 on the sides of older branches. Its flowers have a non-lobed bract , two bracts and consist of two sepals and 20 to 31 stamens . The anthers are hairy. The pollen grains have 3 to 5 germ pores. The female ears stand individually on this year's shoots. Its flowers have a small, non-lobed cover leaf that is fused with the bracts. The two Brakteolen are themselves with the ovary grown. The four sepals are partially fused, free at the top. The scars are bilobed. Pollination takes place by wind ( anemophilia ). Flowering time is May and June.
The infructescence is 25 to 30 cm long and drooping, the axis is glabrous or hairy. The small nuts are spherical and somewhat flattened and around 7 mm in size. They have a circular to oval, leathery wing 2.5 to 6 cm in diameter. The nut is two- to fourfold at the base. The fruits ripen between July and September.
distribution
Cyclocarya paliurus occurs in the east of the People's Republic of China and Taiwan . It grows in moist mountain forests at 400 to 2500 m above sea level.
Systematics
Cyclocarya paliurus was assigned to the genus Pterocarya in the past as Pterocarya paliurus and was placed in its own section or subgenus. Ilyinskaya first proposed it as a genus of its own in 1953 due to its morphological characteristics. This proposal was long rejected. In the analysis of Manos and Stone, the species formed the sister group to the other representatives of Pterocarya , so it forms its own clade . This, together with some characteristics such as the chromosome number of 2n = 56, which is unique in the family, led to the recognition as a separate genus by Lu et al. as well as by Manos and Stone. Together with Pterocarya and Juglans it forms the Subtribus Juglandinae.
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.
