Ceropegia decidua

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Ceropegia decidua
Systematics
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Ceropegieae
Sub tribus : Stapeliinae
Genre : Candlestick flowers ( Ceropegia )
Type : Ceropegia decidua
Scientific name
Ceropegia decidua
EABruce

Ceropegia decidua is a species of the subfamily of the silk plant family (Asclepiadoideae).

description

Appearance and leaf

Ceropegia decidua is a perennial herbaceous plant . A slightly flattened, spherical root tuber with a diameter of 3 to 6 cm is formed as a permanent organ . Occasionally, minor tubers are also formed above the main tubers. Every year a new shoot axis is formed per tuber. The shoot axes, which are only slightly branched at the base, wind and climb only a little; they are sparsely haired, measure 1 to 2 mm in diameter and are up to 40 cm long. The leaves are only short stalked. The fleshy leaf blades are egg-shaped to lanceolate with a length of about 2 cm and a width of about 1 cm. The leaves are hairy with bristly and deciduous; they usually fall off before the onset of the anthesis .

Inflorescence and flower

The only short-stalked inflorescence contains only two to four flowers. The flowers within an inflorescence open one after the other. The flower stalks are relatively short with a length of up to 10 mm. The hermaphrodite flowers are zygomorphic and five-fold with a double flower envelope . The five sepals are lanceolate with a length of about 2 mm. The upright corolla is 2.2 to 2.6 cm long. The five petals are fused in more than three quarters of the length to a straight or only very slightly curved outside smooth corolla tube ( sympetalie ). The "crown kettle" is egg-shaped and measures 5 to 7 in length and 3.5 mm in diameter. The corolla tube is brownish on the outside. The inside of the "Kronkessel" is greenish-purple and provided with papillae . The actual corolla tube is narrowed to 2 mm in diameter above the coronet and hardly widens towards the mouth of the corolla tube; this is hairy inside. The upright petal lobes are linear-spoon-shaped and 4 to 6 mm. The lobes are only bent outward in the middle along the longitudinal axis. The tips are fused together and form a cage-like, egg-shaped structure, the upper end of which is flattened; they are purple on the inside and the edges are trimmed with purple hair. The sessile secondary crown is fused like a cup at the base and has a length of 2.5 mm and a diameter of 2.5 mm. The tips of the interstaminal coronet are transformed into deep, egg-shaped pockets, the sides are fused to the base of the staminal coronet. They stand upright, protrude beyond the gynostegium and are obtuse triangular at the top; the top edge is often notched. The tips of the staminal inner secondary crown are about 2 mm long, spoon-shaped stand upright and then bend together. The tips are again slightly bent back. The pollinia measure 0.25 mm in diameter.

Fruit and seeds

The follicles are slender spindle-shaped with a length of 5 to 6 cm and a diameter of 2 to 3 mm. Information on seeds is not available.

Similar species

The corolla of Ceropegia decidua is similar to the corolla of Ceropegia occulta .

distribution

The distribution area of Ceropegia decidua extends over the South African provinces of North Cape and Gauteng to Swaziland . The subspecies Ceropegia decidua subsp. pretoriensis the subspecies Ceropegia decidua subsp. decidua in Gauteng.

Systematics

The first description of Ceropegia decidua was made in 1951 by Eileen Adelaide Bruce in the sixth volume of the journal Bothalia , S. 213th

It is a variable species of which two subspecies are currently validly described:

  • Ceropegia decidua E.A. Bruce subsp. decidua
  • Ceropegia decidua subsp. pretoriensis R.A.Dyer . This subspecies differs from the nominate form in that it is usually smaller (up to 25 cm) and only slightly coiling. The leaf blades are egg-shaped to elliptical, pointed and only up to 1.5 cm long and 1 cm wide. The inflorescence usually consists of only one to three flowers and the sepals are more triangular. The corolla tube is on average slightly smaller with a length of 2 to 2.4 cm. The "Kronkessel" is rather spherical and measures 3.5 × 3.5 mm; the papillae inside are somewhat coarser. The actual corolla tube is somewhat more narrowed (up to 1.5 mm in diameter). The petal lobes are linear. The lamina of the lobes are bent back basally along the midrib, not too practically at the ends. They form an egg-shaped, tapered cage towards the end. The tips are purple at the base, too greenish and hairless at the ends. The bowl-shaped secondary crown is pentagonal when viewed from above and slightly smaller at 2.5 × 2.5 mm. The tips of the interstaminal side crown are converted into flat, flared pockets and are as long as the gynostegium . The edges are horizontal and smooth. The tips of the staminal side crown are slightly shorter at 1.5 mm.

supporting documents

literature

  • Robert Allen Dyer: Ceropegia, Brachystelma and Riocreuxia in southern Africa. VIII, 242 pp., Rotterdam, Balkema, 1983 ISBN 90-6191-227-X (pp. 212-214)
  • Herbert H. Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (p. 115 in the synonymy of Ceropegia euryacme )
  • Ulrich Meve: Ceropegia . In: Focke Albers, Ulrich Meve (Hrsg.): Sukkulentenlexikon Volume 3 Asclepiadaceae (silk plants) , pp. 61-107, Eugen Ulmer Verlag, Stuttgart 2002. ISBN 3-8001-3982-0 (p. 73)

Individual evidence

  1. Jump up ↑ Eileen Adelaide Bruce, Anna Elizabeth Brueckner, Robert Allen Dyer, Pauline Kies & Inez Clare Verdoorn: Newly described species. In: Bothalia , Volume 6, Number 1, 1951, pp. 213-248, Pretoria (pp. 213/4). ( PDF )
  2. ↑ Ulrich Meve: Ceropegia Checklist. A guide to alternative names used in recent Ceropegia classification. In: Dennis de Kock, Ulrich Meve: A Checklist of Brachystelma, Ceropegia and the genera of the Stapeliads. International Asclepiad Society 2007, pp. 83-113.

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