Hoya longifolia
| Hoya longifolia | ||||||||||||
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| Scientific name | ||||||||||||
| Hoya longifolia | ||||||||||||
| Wall. ex Wight |
Hoya longifolia is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya longifolia is a perennial , epiphytic or epilithic plant with climbing and twisting shoots. They are branched, the side shoots hang down. The shoots are up to about 3 m long and are hairless or hairy. The leaves are stalked, the thick petioles are 8 to 13 mm long. Leaf blades are narrowly lanceolate to linear, 5 to 20 cm long and 1.2 to 2.6 cm wide. The bottom is convex, the top has a longitudinal furrow. They are thick, dark green with a glossy top and a slightly lighter underside. The apex is pointed long, the base is narrowly pointed or rounded. The leaf veins are barely visible.
The umbel- shaped inflorescences develop extraxillary and contain up to 12 flowers. The surface of the inflorescence is convex. The thick and bare inflorescence stalks are 1.2 to 5 cm long. The flower stalks are 1.2 to 2.6 cm long. The sepals are ovate, 1 to 1.5 mm long; they are bald and tapered to a point. The whitish, also slightly pink-tinted corolla is spread out in a star shape and has a diameter of 1 to 2.5 cm. The petal lobes are triangular. They are hairy on the inside, the edges are covered with eyelashes. The secondary crown is cream-colored to slightly reddish. The tips are obovate, broadly ovoid, slightly depressed in the middle and convex on the outside. The outer process is broad and round and slightly ascending, the inner process pointed and ascending. The spindle-shaped, smooth outside follicle is 10 to 30 cm long and measures 0.5 to 0.8 cm in cross section. The seed is egg-shaped, 1 to 3 mm long with a 1.2 to 1.5 cm long tuft of hair.
At its natural habitat in Yunnan (China), the species blooms in July / August. 2n = 22.
Similar Art
The shape and size of the leaves of Hoya longifolia vary considerably, and the size of the corolla is also variable. According to Wanntorp et al. (2011) Hoya longifolia forms a small monophylum together with Hoya thomsonii , Hoya serpens and Hoya polyneura , with Hoya serpens being the presumed sister species.
Geographical distribution and habitat
The range of the species extends from Kashmir over Bhutan, Nepal, northern India (Uttar Pradesh, Sikkim, West Bengal, Assam, Meghalaya, Tripura, Nagaland, Manipur, Mizoram), Myanmar, Thailand, the Nicobaren up to Yunnan (China). In Yunnan the species grows in subtropical mountain forests at 1400 to 2400 m above sea level. Kloppenburg & Wayman give an elevation distribution of 1000 to 4500 feet (approx. 300 to 1570 m).
Taxonomy
The taxon Hoya longifolia was established by Robert Wight in 1834 , based on material collected by Nathaniel Wallich near Mussooree (Uttar Pradesh). The herbarium records are kept in the Kew Gardens Herbarium (K000873074) and in the Herbarium of the Royal Botanic Garden Edinburgh .
literature
- Christiane Hoffmann, Ruurd van Donkelaar, Focke Albers: Hoya. In: Focke Albers, Ulli Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 147-160, Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (p. 155).
- Robert Dale Kloppenburg, Ann Wayman: The World of Hoyas - a pictorial guide. A revised version. 248 pp., Orca Publishing Company, Central Point, Oregon, 2007 ISBN 0-9630489-4-5 (pp. 150/51)
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 89)
Individual evidence
- ↑ Livia Wanntorp: Pollinaria of Hoya (Marsdenieae, Apocynaceae): Shedding Light on Molecular Phylogenetics. Taxon, 56) (2): 465-478, 2007 online at JSTOR
- ^ Kew Science - Plants of the World online: Hoya longifolia
- ↑ www.eFloras.org Flora of China: Hoya longifolia Wallich ex Wight
- ^ Robert Wight: Contributions to the botany of India. Parbury, Allen & Co., London 1834. Online at Google Books , p. 36.