Annamocarya sinensis

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Annamocarya sinensis
Systematics
Rosids
Eurosiden I
Order : Beech-like (Fagales)
Family : Walnut family (Juglandaceae)
Genre : Annamocarya
Type : Annamocarya sinensis
Scientific name of the  genus
Annamocarya
A.Chev.
Scientific name of the  species
Annamocarya sinensis
( Dode ) Leroy

Annamocarya sinensis is an East Asian tree from the walnut family(Juglandaceae). Its position as a separate genus Annamocarya is not secured, the species is alternatively placed as Carya sinensis in the genus Carya .

features

Annamocarya sinensis is an evergreen tree. The twigs have a firm pith , rarely a hollow one. The latter is attributed to ants. The buds have scales.

The leaves are pinnate unpaired with 7 or 9, rarely 11 leaflets. The leaves are 30 to 50 cm long, the petiole 5 to 15 cm. Stems like rachis are bare. The leaf margin is whole. The lateral leaflets are stalked 2 to 8 mm long, their blade is long, elliptical to elliptical-lanceolate, 12 to 23 cm long and 4 to 9 cm wide. The underside is bald with the exception of some hairs in the nerve axils. The base is trimmed, the point pointed. The stalk of the terminal leaflet is 5 to 20 mm long.

The inflorescences are laterally or terminally on this year's shoots. Male and female inflorescences are separate. The male catkins are 13 to 15 cm long, pendulous ears with a 3 to 6 cm long stem and stand in groups of 5 to 8 on the side of the axils of the new leaves. The female ears are terminal and upright. The flowers are pollinated by the wind ( anemophilia ). The male flowers have a non-lobed bract , two bracts , no sepals and 5 to 15 stamens with hairy anthers . In the female flowers which also ungelappte bract is the ovary grown, as well as the three Brakteolen. Sepals are absent. The presence of a stylus is not clear. The scars are commissural, one scar disk seems to be missing. Flowering time is April to May.

The fruit cluster is an upright ear. The fruit is stone fruit-like . The envelope is thick and consists of 4 to 9 flaps. It envelops a smooth nut that is twofold at the base. The nut is spherical to ovoid-ellipsoidal. The tip is pointed to beaked. The nut is 6 to 8 cm long and 4 to 6 cm wide. The nutshell is 3 to 4 mm thick. Fruit ripening is August to November.

The germination takes place hypogeous.

distribution

Annamocarya sinensis occurs only in the southwest of China ( Guangxi , South Guizhou , Southeast Yunnan ) and in the north of Vietnam . It grows here in the woods along rivers at 200 to 700 m above sea level.

Systematics

Annamocarya was first described in 1941 by Chevalier as Annamocarya indochinensis , shortly afterwards by Kuang as Ramphocarya integrifoliolata . However, both names were later considered synonyms of Carya sinensis , which was described by Dode in 1912. Chevalier had also described practically identical fruits as Juglans indochinensis . In Carya she was placed in a separate section Rhamphocarya . However, the differences in characteristics are greater than those between the other sections of Carya . For these reasons, the species is considered a separate genus in the Flora of China. Manos & Stone (2001) counter this, however, with the lack of any autapomorphy for the species, and their independence is only partially supported by their cladistic analyzes. In their 2007 paper, Manos et al. the species again as Carya sinensis in the genus Carya .

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

  1. ↑ 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

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