Ceropegia hookeri
| Ceropegia hookeri | ||||||||||||
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| Ceropegia hookeri | ||||||||||||
| CBClarke ex Hook. f. |
Ceropegia hookeri is a species of plant from the subfamily of the asclepiadoideae (Asclepiadoideae). It occurs in the mountain forests of the Himalayas .
features
Appearance, root, stem and leaf
Ceropegia hookeri is a perennial , herbaceous plant . The roots are spindle-shaped and fleshy. The stiff, soft woody, 20 to 60 cm long, weakly, on one side finely or downy hairy shoot axes have a diameter of 2 to 3 mm, grow upright, sometimes twisting or lying on the ground. In the natural habitat, this species grows both upright and lying flat, but often only upright in culture.
The leaves are divided into a petiole and a leaf blade. The 1 to 15 mm long petiole is finely hairy. The relatively thin, membranous leaf blades are egg-shaped or lanceolate with a length of 2 to 4 cm and a width of 0.5 to 3 cm, rarely kidney-shaped with a wedge-shaped to rounded blade base and a pointed upper end. The petioles and the upper and lower surfaces of the leaves are sparsely hairy.
Inflorescence and flower
The inflorescences contain one or two to seven flowers. The inflorescence stem is up to 1 cm long and finely haired on one side. The flower stalk is about 5 mm or 7 to 8 mm long and glabrous.
The hermaphrodite flowers are zygomorphic and five-fold with a double flower envelope . The five sepals are lanceolate with a length of 1.5 mm or linear-lanceolate and glabrous with a length of 3 to 4.5 and a width of 0.6 to 1 mm. The corolla is 1 to 2 cm long and bare on the outside. In the lower part the five petals are fused into a straight corolla tube ( sympetalie ). The 1 to 1.2 cm long corolla tube is green or purple in color. The corolla tube is thickened at the base, the "coronet" has a maximum diameter of 6 mm. The diameter decreases continuously from the "crown bowl" to the mouth of the flower to 3 to 5 mm. The corolla tube is hairy inside. The corolla lobes are 3 to 15 mm long and ovate to broadly lanceolate-spatulate. The two leaflets (laminae) of the tip are only slightly curved along the central axis to the outside. The ends of the tips are fused together and form a flattened, spherical, cage-like structure. The inlets are only slit-shaped due to the low degree of curvature of the leaflets. The secondary crown has a short stalk and only fused in a bowl-shaped manner at the base. The short tips of the interstaminal , outer corolla are shaped into pockets and laterally fused with the base of the staminal corolla like wings. The ends are blunt and hairy at the edges. The tips of the staminal , inner secondary crown are narrowly linear-cylindrical in shape, stand upright and then bend together. The pollinia are D-shaped. At the natural site, the flowering period extends from June to September.
Fruit and seeds
The paired follicles are cylindrical, round in cross section, and 4 to 6 cm (2 to 5 cm) long.
Occurrence
Ceropegia hookeri occurs in India ( Sikkim ), Nepal , Bhutan and in China ( Sichuan Province ? And the autonomous region of Xizang = Tibet). It grows there in the highlands at altitudes of around 2300 to 3300 meters. Nautiyal, Sharma & Pandit (2009) found a population of this species in northern Sikkim at altitudes of 2700 meters in the grasslands, together with other herbaceous plants such as Anaphalis contorta (D.Don) Hook. f., Anemone obtusiloba D. Don, Drosera peltata Thunb., Eulalia mollis (Griseb.) Kuntze, Euphorbia wallichii Hook. f., Polygonatum cirrhifolium (Wall.) Royle, Pteris nepalensis H.Ito, Roscoea purpurea Sm. and Vincetoxicum hirundinaria Medik. Between bushes was Ceropegia hookeri with Eurya acuminata DC, Gauliheria nummularioides D.Don, Pierisformosa (Wall.) D.Don, Rhododendron arboreum Sm. Socialized. The area receives around 2500 mm of rainfall from June to August . There is a lot of snow in winter and the area is covered in snow intermittently from late December to February. Despite an intensive search, the authors of this work only found this one population, which consisted of eight to ten specimens.
Taxonomy
The first description of Ceropegia hookeri was in 1883 by Joseph Dalton Hooker in the 4th volume of the Flora of British India . He used a manuscript (or even a manuscript name) by Charles Baron Clarke . The holotype was from Lachen , Sikkim , India.
Herbert Huber described the variety Ceropegia hookeri var. Mollis H.Huber from Nepal in 1955 , which today is generally valued as a younger synonym of Ceropegia hookeri .
supporting documents
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 (pp. 80–81)
- DC Nautiyal, SK Sharma, MK Pandit: Notes on the taxonomic history, rediscovery and conservation status of two endangered species of Ceropegia (Asclepiadaceae) from Sikkim, Himalaya. In: Journal of the Botanical Research Institute of Texas , Volume 3, 2009, pp. 815-822 online at www.archive.org .
- Herbert H. Huber: Revision of the genus Ceropegia. In: Memórias da Sociedade Broteriana , Volume 12, 1957, pp. 1–203, Coimbra (description of Ceropegia hookeri, pp. 47–48)
- Bingtao Li, Michael G. Gilbert, W. Douglas Stevens: Asclepiadaceae : Ceropegia hookeri , p. 270 online with the same text as the printed work In: Wu Zheng-yi, Peter H. Raven (ed.): Flora of China. Volume 16: Gentianaceae through Boraginaceae. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 1995. ISBN 0-915279-33-9 (Description section)
Individual evidence
- ↑ a b c d e f g h Bingtao Li, Michael G. Gilbert, W. Douglas Stevens: Asclepiadaceae : Ceropegia hookeri , p. 270 online with the same text as the printed work In: Wu Zheng-yi, Peter H. Raven (Ed.) : Flora of China. Volume 16: Gentianaceae through Boraginaceae. Science Press and Missouri Botanical Garden Press, Beijing and St. Louis, 1995. ISBN 0-915279-33-9
- ↑ a b Arun Chettri, Saroj K. Barik, Mark K. Lyngdoh, Harendra N. Pandey: Plantae, Magnoliophyta, Gentianales, Apocynaceae, Asclepiadoideae, Ceropegia hookeri: Distribution and rediscovery in eastern Himalayas, Sikkim, India. In: Check List , Volume 5, No. 3, 2009, pp. 695-698 PDF
- ^ Alan Hart: Some Nepali Ceropegias. In: Asklepios , Volume 47, 1988, pp. 71-74.
- ^ Joseph Dale Hooker (assisted by various botanists): The Flora of British India. Volume 4, Asclepiadeae to Amarantaceae. London, Reeve 1883, published under the authority of the secretary of state for India in Council (p. 73) Online at www.biodiversitylibrary.org
- ^ A b 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.
Web links
- Alexander Lang's website
- Ceropegia hookeri (photo of the flower)