Ceropegia pachystelma
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Ceropegia pachystelma is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae). It is common in southern Africa .
features
Appearance, tuber, stem and leaf
Ceropegia pachystelma is a perennial herbaceous plant . A warty tuber with a diameter of 4 to 12 centimeters is formed as a permanent organ . The mostly annually new sprouting, downy hairy shoot axes are herbaceous to several meters long (high) and twining with a diameter of 1 to 2 millimeters. The leaves are divided into a petiole and a leaf blade. The petiole is 2 to 6 millimeters long. The slightly fleshy leaf blade is 22 to 50 millimeters long and 8 to 15 millimeters wide and lanceolate, ovate to narrowly elliptical and prickly. The leaf margins are usually wavy and hairy.
Inflorescence and flower
The hairy inflorescence stem is 5 to 15 millimeters long. The inflorescence contains two to many flowers.
The hermaphrodite flowers are zygomorphic and five-fold with a double flower envelope . The five sepals are triangular-lanceolate and 2 millimeters long. The corolla is 2 to 3 inches long. The five petals are fused in over three quarters of the length to a slender, only slightly curved, externally hairy corolla tube ( sympetalie ). The corolla tube is greenish, partly with a purple pattern. The basal part of the corolla tube, the so-called "corolla basin", is approximately 4 millimeters long and 4 to 5 millimeters in diameter inflated spherically to ovoid. The "Kronkessel" is hairy inside and outside. The actual crown tube, which is 15 to 25 millimeters long, is gradually drawn in above the "crown bowl" and narrowed to 1.5 millimeters in diameter. The corolla tube widens relatively little towards the mouth of the flower (to 3 millimeters in diameter). The tips of the petals are linear and more or less flat with a length of 4 to 12 millimeters. H. the edges are not bent outwards. The ends of the petal lobes are fused together and form an egg-shaped, cage-like structure that is 5 to 7 millimeters wide (or has a diameter) and 5 to 9 millimeters long. The short-stalked secondary crown is fused at the base and is flat, bowl-shaped at a height of about 2 millimeters and a diameter of 2 millimeters. The tips of the interstaminal , outer secondary crown are 0.7 millimeters long and oval in outline and horizontally pocket-shaped; they are entire margins and fused on the sides with the base of the staminal corolla. The tips of the taminal secondary crown are 1.5 to 2 millimeters long and lanceolate with their tips bent back. The pollinia are egg-shaped, pointed and measure 0.22 × 0.14 millimeters.
Fruit and seed
The follicles are slender, spindle-shaped and 6 to 14 centimeters long. The seeds are not described.
Similar species
Ceropegia pachystelma belongs to the species group around Ceropegia africana , Ceropegia linearis and Ceropegia rendallii due to its comparatively small, greenish and hairy flowers .
Occurrence and endangerment
The distribution area of Ceropegia pachystelma stretches from South Africa (provinces Eastern Cape , KwaZulu-Natal , Mpumalanga , Limpopo , Northwest ), Swaziland , Mozambique , Namibia , Botswana to Zimbabwe .
In Namibia, Ceropegia pachystelma grows under trees in wooded habitats . The trees are species of the genera Grewia and Terminalia as well as Acacia and Dichrostachys . The epithet of the synonym Ceropegia acacietorum from Ceropegia pachystelma alludes to this location .
Ceropegia pachystelma is rated as “Least Concern” = “not at risk” in South Africa.
Taxonomy
The first description of Ceropegia pachystelma was in 1895 by Rudolf Schlechter . Ceropegia pachystelma is accepted as a valid species by U. Meve in the "Ceropegia Checklist". Due to the variability of the species there are the following synonyms (according to U. Meve): Ceropegia undulata NEBr., Ceropegia pachystelma subsp. undulata (NEBrown) H.Huber, Ceropegia acacietorum Schltr. ex Dinter, Ceropegia boerhaaviifolia Schinz nom. illeg., Ceropegia schinziana Bullock.
supporting documents
literature
- Peter Vincent Bruyns: Ceropegia, Brachystelma and Tenaris in South West Africa. In: Dinteria , Volume 17, 1984, Windhoek PDF
- Robert Allen Dyer: Ceropegia, Brachystelma and Riocreuxia in southern Africa. VIII, 242 pp., Rotterdam, Balkema, 1983 ISBN 90-6191-227-X (pp. 220-221)
- KR Jahne: Ceropegia pachystelma. In: Kakteen und other Succulents , Volume 38, No. 7, 1987, pp. 157-158.
- 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. 92/3)
Individual evidence
- ↑ Ceropegia pachystelma subsp. pachystelma in the Red List of South African Plants . Classified by: W. Foden & L. Potter, 2005
- ^ Rudolf Schlechter: Contributions to the knowledge of South African Asclepiadeen. In: Botanical Yearbooks for Systematics, Plant History and Plant Geography , Volume 20, Beiblatt No. 51, 1895, pp. 1-56, Leipzig. Online at www.biodiversitylibrary.org (p. 47)
- ↑ 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.
- ^ Herbert Franz Josef Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (pp. 119–120)