Ceropegia meyeri
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Ceropegia meyeri , flower and leaves |
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Ceropegia meyeri is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae).
features
Vegetative characteristics
Ceropegia meyeri is a perennial herbaceous plant with a tuber. The tuber is flattened, almost disc-shaped, measures 4 to 7 cm in diameter and has a cracked bark on the surface. The shoots are winding and 1 to 2 m long. They have a diameter of 1 to 3 mm and are covered with short hair. They die in the winter dry season and sprout again in spring. The leaves are stalked, the stems are 0.8 to 3 cm long. The delicate leaf blades are very variable in shape, from elliptical, egg-shaped to broadly lanceolate; they are 2 to 5 cm long and 0.8 to 3 cm wide. The hairy edges are often indented, notched or lobed,
Inflorescence and flowers
The inflorescence sits without a stem or only with a short, thickened stem in the leaf axils. It usually has 2 to 4 flowers, rarely up to 10 flowers, which open one after the other. The flower stalks are 0.5 to 2 cm long and shaggy hairy. The sepals are subulate, 0.7 to 1 cm long and shaggy hairy. The bottle-shaped corolla is 4 to 6 cm long. The crown basin is whitish-greenish on the outside, the upper two thirds of the corolla have reddish brown longitudinal stripes and spots and a white background. The bottle-shaped crown cup measures 25 to 40 mm, with a maximum diameter of 7 to 9 mm. It then decreases continuously upwards to 2 to 3 mm, then widens to 6 to 8 mm towards the flower opening. The petal lobes are linear and curved back along the midrib. They measure 10 mm in length and 3 mm in width and are fused together apically. They form a hemispherical, cage-like structure. The inside of the petal tips are velvety black with greenish vertical stripes. The edges in particular are hairy. The whitish corolla has a short stalk and fused into a cup-shaped base. The tips of the interstaminal (outer) secondary crown are triangular and tapering to a point, approx. 1 mm long and erect. The tips of the staminal (inner) secondary crown are approx. 2 mm long, linear-spatulate and upright. They are inclined and have an inward indentation in the middle. The ends are bent inwards. The tips are colored black-purple at the base.
Fruits and seeds
The follicles are slender spindle-shaped and measure 8 to 12 cm in length and 3 mm in cross-section.
Similar species
According to Meve, Ceropegia meyeri is said to be closely related to Ceropegia bonafouxii , somewhat further related to Ceropegia paricyma and Ceropegia stenoloba . It differs in its unique, bottle-shaped flower.
Geographical distribution and ecology
The species has a larger range that extends from South Africa ( Eastern Cape , KwaZulu-Natal , Mpumalanga and Transvaal ) via Mozambique , Zimbabwe , Malawi , Zambia to Namibia .
Taxonomy and Phylogeny
Ceropegia meyeri was first validly described by Joseph Decaisne in 1844. According to Decaisne, the holotype came from Basche and Morley in South Africa. An older synonym and invalid name is Ceropegia pubescens E. Meyer (1837). The name honors the botanist Ernst Heinrich Friedrich Meyer , who was the first to describe the species under an invalid name. The holotype came from the Basche River in the former Transkei .
According to the phylogenetic analysis by Bruyns et al. (2015) Ceropegia meyeri is the sister species of Ceropegia kituloensis . These two species together form the sister taxon of a clade with Ceropegia stenoloba , Ceropegia namuliensis and Ceropegia claviloba .
literature
- Ulrich Meve: Ceropegia . In: Focke Albers, Ulrich Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 61-107, Eugen Ulmer Verlag, Stuttgart 2002. ISBN 3-8001-3982-0 , p. 89.
- R. Allen Dyer: Ceropegia, Brachystelma and Riocreuxia in Southern Africa. AA Balkema, Rotterdam, 1983, pp. 222-223.
Individual evidence
- ↑ a b P.V. Bruyns, C. Klak ,, P. Hanáček: Recent radiation of Brachystelma and Ceropegia (Apocynaceae) across the Old World against a background of climatic Change Molecular Phylogenetics and Evolution , 90: 49–66, 2015 doi : 10.1016 / j.ympev. 2015.04.015
- ↑ Joseph Decaisne: Asclepiaedeae. In: Alphonse Pyrame de Candolle (Ed.): Prodromus Systematis Naturalis Regni Vegetabilis. Pars 8. Sistens Coralliflorarum Ordines XII. Fortin, Masson & Cie., Paris 1844, p. 644 online at www.botanicus.org .