Ceropegia decaisneana
| Ceropegia decaisneana | ||||||||||||
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Ceropegia decaisneana Wight (from Spicilegium Neilgherrense, plate 152 from 1851) |
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| Scientific name | ||||||||||||
| Ceropegia decaisneana | ||||||||||||
| Wight |
Ceropegia Decaisneana is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae). It occurs in southern India and Sri Lanka .
features
Vegetative characteristics
Ceropegia decaisneana is a perennial , herbaceous , twisting plant with a spherical tuber . The shoots are hairy at least on the leaf nodes. The leaves are only short stalked, 1.9 to 2.5 cm long. The leaf blades are narrowly elliptical, lanceolate or ovate; they measure approx. 15 to 20 cm in length and approx. 2.5 cm in width. The upper side is sparsely hairy, the lower side glabrous. The base is pointed, the end is also pointed.
Inflorescence and flowers
The stalked and hairy, mostly pendulous inflorescence is 3- to 8-flowered, the inflorescence stalk is approx. 3.2 to 3.8 cm. It is usually longer than the also hairy flower stalks . The five-fold, hermaphrodite flowers are zygomorphic and provided with a double flower cover. The sepals are elongated-thread-shaped. The corolla is comparatively large at 4 to 7.7 cm. In the lower part, the five petals are fused into an occasionally slightly hairy corolla tube ( sympetalie ). The buds in particular are slightly hairy. The corolla tube is whitish green with red-brown patterns. The lower half is inflated to form an egg-shaped crown cup measuring 20 mm × 15 mm. The crown basin goes abruptly into the actual, usually slightly curved crown tube, and the diameter is reduced to 3 to 4 mm. At this point there is a wreath of hair inside. Towards the mouth of the flower, the corolla tube widens again to a diameter of about 15 mm. The corolla lobes have a triangular base and are very long with 2 to 4 cm in relation to the corolla. They are narrow, linear, spatulate, taper towards the outer end and are fused together there. They form an oblong-conical, cage-like structure, the greatest width of which is at the base. The tips are almost completely turned outwards along the longitudinal axis; they are covered with cilia on the inside and darkly colored, or with dark veins on a light background. The corolla is sessile, flat-shell-shaped at the base and is yellowish-orange in color. The hairy tips of the interstaminal, outer secondary crown are triangular, upright, incised in the middle and divided into two triangular processes. The tips of the staminal, inner secondary crown are 2 to 3 mm about twice as long as the tips of the outer secondary crown. They are linear-spatulate in shape, stand upright and only incline incompletely together. They are deep purple on the inside, only the tips are purple on the outside.
Fruits and seeds
The paired follicles are very long and very slender. No information is available on the seeds.
Similar species
Ceropegia decaisneana is closely related to Ceropegia metziana , which, however, presumably does not have a tuber. The large flowers are similar to the flowers of the Malagasy Ceropegia scabra .
Geographical distribution and ecology
The kind is common in the southern Indian states of Karnataka , Kerala and Tamil Nadu as well as in Sri Lanka . It grows there to about 750 to 1800 m above sea level.
According to Robert Wight's description, the species should bloom in March / April. In contrast, Ansari (1984) and Japtap et al. (1999) indicate the flowering period from October to December. According to these authors, the fruits can be found in December / January.
Taxonomy
The taxon was first described in 1848 by Robert Wight in the fourth volume of his Icones plantarum Indiae orientalis on Plate 1259. The type material comes from the Nilgiri Mountains on the road from the Sispara Pass to Malabar (Kerala, India).
According to Ulrich Meve, the taxa Ceropegia gracilis Beddome, described in 1864 and Ceropegia brevicollis Hook.f., described in 1883, are younger synonyms . Herbert Huber eliminated two varieties in 1957, Ceropegia decaisneana var. Decaisneana and Ceropegia decaisneana var. Brevicollis (Hook.f.) H. Huber, which are not recognized as valid taxa by either the Plant List or the Ceropegia Checklist .
supporting documents
literature
- MY Ansari: Asclepiadaceae: Genus Ceropegia. In: Fascicles of Flora of India , Fascicle 16, 1984, pp. 1-34, Botanical Survey of India, Howrah (pp. 13/4)
- Joseph Dalton Hooker (assisted by various botanists): The flora of British India. Volume 4. Asclepiadeae to Amarantaceae. London, Reeve & Co., 1885. Online at www.biodiversitylibrary.org (p. 73/4)
- Herbert H. Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (pp. 62/3)
- AP Jagtap, N. Singh, N .: Asclepiadaceae and Periplocaceae. In: Fascicles of Flora of India , Fascicle 24, 1999, pp. 211-241, Botanical Survey of India, Kolkata (p. 220).
- 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 (pp. 72/3)
- Robert Wight: Spicilegium Neilgherrense, or, a selection of Neilgherry plants: drawn and colored from nature, with brief descriptions of each; some general remarks on the geography and affinities of natural families of plants, and occasional notices of their economical properties and uses. Volume 2, 94 pp., Pl. 103-202, Madras, self-published, 1851 Online at www.biodiversitylibrary.org (p. 47, Pl. 152).
Individual evidence
- ↑ a b Henry Trimen: A hand-book to the flora of Ceylon: containing descriptions of all the species of flowering plants indigenous to the island, and notes on their history, distribution, and uses. Pt. 3: Valerianaceae - Balanophoraceae. with the tables LI-LXXV, London, Dulau & Co., 1895 online at www.biodiversitylibrary.org (p. 166).
- ^ Robert Wight: Icones plantarum Indiae orientalis, or figures of Indian plants. Volume 4: pp. 1163–1621, Madras, Franck, 1850. Online at www.biodiversitylibrary.org (p.14) (plate 1262)
- ^ Rafael Govaerts (ed.): World Checklist of Selected Plant Families (in review): Ceropegia. Published in: The Plant List. A working list of all plant species. Royal Botanic Gardens Kew, Missouri Botanical Garden, accessed February 5, 2014.
- ↑ 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.
