Ceropegia dinteri
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Ceropegia dinteri is a species of the subfamily of the silk plant family (Asclepiadoideae). The species is native to Namibia .
features
Vegetative characteristics
Ceropegia is a perennial , upright, non-twisting plant with a bulbous rhizome. The tubers vary in shape from flattened-rounded to disk-shaped with a diameter of up to 12 cm and a thickness of 5 to 6 cm to beet-shaped. A mostly unbranched, herbaceous and hairless shoot from 15 to 35 cm in height appears from the tuber every year . The narrow, linear, 12 to 16 cm (8 to 13 cm) long and only up to 4 mm (up to 3 mm) wide leaf blades start directly on the stem axis. The edges are bent back, the central rib is raised and clearly formed on the underside. Shoot and leaves die off in the dry season.
Inflorescence and flowers
The single-flowered inflorescence starts directly on the stem axis; at first it is terminal, as the plant continues to grow, it finally sits to the side. The flower stalks are 5 to 8 mm long. The hermaphrodite flowers are zygomorphic and five-fold and have a double flower envelope. The narrow-lanceolate sepals are 2 to 4 mm long. The five petals are fused in the basal half to a straight, bare outside corolla tube ( sympetalie ). The usually 4 to 10 cm long (high) corolla is greenish-white on the outside, greenish on the inside. The base of the corolla tube ("Kronkessel") is inflated ovoid and has a diameter of approx. 5 mm. The crown basin gradually merges into the actual crown tube, which reduces to 3 to 4 mm in diameter and widens in a funnel shape towards the opening of the flower. A diameter of 6 to 7 mm is measured here. The petal lobes have a triangular base, are then abruptly linear and up to 4.5 cm long. The lamina are almost completely bent outwards along the longitudinal axis, the inner sides thus visible are whitish. The tips are free, upright and only slightly splayed, often also crossed. The triangular base is colored red-brown, the linear section brown. Long, thick, sub-cylindrical and vibratile hairs sit at the base of the linear section of the lobes, while the rest of the lobes are covered with thin and immobile hair. The sessile secondary crown is fused at the base and shaped like a cup. The hairy tips of the interstaminal, outer secondary crown are triangular, upright and run to the outer end in two (three according to the succulent lexicon ) spreading appendages. The lobes of the staminal inner corolla are 2 mm long, twice as long as the interstaminal lobes and linear (or tongue-shaped) in shape, and they incline towards the outer end over the stylus head or lie against one another. The pollinium is egg-shaped and measures 0.35 × 0.25 mm.
Fruits and seeds
The fruits and seeds are not yet known.
Similar species
According to Ulrich Meve in the succulent lexicon , Ceropegia dinteri is very closely related to Ceropegia deightonii from West Africa, "if not con-specific ". There is also a similarity with Ceropegia antennifera Schltr., Ceropegia insignis , Ceropegia turricula , Ceropegia ledermannii and Ceropegia attenuata .
Geographical distribution and ecology
The species occurs in Namibia . Locations are: Outjo , Tsumeb , Grootfontein , Otjiwarongo and Rehoboth . It grows in the stony to rocky, dry thorn bush savannah and 1200 to 1500 m above sea level.
Taxonomy
The species was first described by Rudolf Schlechter in 1914. The only illustration of the species is given by Robert Dyer in 1983 in his work Ceropegia, Brachystelma and Riocreuxia in southern Africa. on p. 189, fig. 98 and color plate 17.
supporting documents
literature
- Robert Allen Dyer: Ceropegia, Brachystelma and Riocreuxia in southern Africa. VIII, 242 p., Balkema, Rotterdam 1983, ISBN 90-6191-227-X (p. 189/1)
- Herbert H. Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (description by C. dinteri p. 134)
- 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. 68)
Individual evidence
- ↑ a b c d e Rudolf Schlechter: Asclepiadaceae africanae. In: Botanical Yearbooks for Systematics, Plant History and Plant Geography , Volume 51, 1914, pp. 129–155, Leipzig Online at www.biodiversitylibrary.org (p. 153)
annotation
- ↑ They cannot be explained. T. considerable differences in characteristics and dimensions in the first description and the description in the succulent dictionary . Here Meve specifies a corolla lobe length of only 9 to 13 mm. Robert Dyer does not give any measurements, but states: the corolla tube is only slightly longer than the corolla lobes, which agrees with Rudolf Schlechter's statement (see also the illustration in Dyer, 1983: Fig. 98 on p. 189) .
- ↑ In the illustration of the secondary crown that Dyer (1983) gives on his color plate 17, only two peaks can be clearly seen.