Hoya hypolasia
| Hoya hypolasia | ||||||||||||
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Hoya hypolasia , original illustration by Schlechter: 1913, Fig. 4, A flower B calyx tips C gynostegium with corona D, E, F corona scales G pollinarium |
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Hoya hypolasia is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya hypolasia is a perennial , climbing, twisting plant with thin, thread-like shoots. The sparsely branched shoots have a diameter of up to 2 mm and are only sparsely leafed. They are covered with numerous, warty lenticels. Fresh shoots are finely hairy, older shoots are more or less glabrous. The leaves are short stalked, the petioles are up to an inch long and furrowed on the top of the stalk. The leaf stalks are also very short and softly hairy. The leaf blades are spread out, lanceolate in shape, and 12 to 20 cm long and 3.3 to 5.3 cm wide. The apex is pointed long, the base is weakly heart-shaped. They are leathery with a dark green, shiny top. The upper side is glabrous, the underside very short and densely hairy, weakly downy. The lighter leaf veins emerge clearly. About six pairs of secondary ribs branch off from the strong central rib. The pairs are not exactly opposite each other, but are slightly offset from one another.
The umbel-shaped inflorescence contains 8 to 25 flowers. The surface of the inflorescence is flat convex. The inflorescence stalk measures 5 cm in length and is slightly downy hairy. The thin flower stalks are about 5 cm long and bare. The sepals are egg-shaped and about 2 mm long. They run out bluntly and have short hair at the edge. The corolla has a diameter of 2.1 cm. It is yellowish-white, with a slightly reddish tint on the outside. It is bare on the outside and covered with tiny papillae on the inside. The corolla lobes are broad, rhombic-egg-shaped and tapering to a point. The tips of the staminal secondary crown are obliquely square, 3.5 mm long and 3 mm wide, when viewed from the side. They incline to the edge of the stylus head together. The pollinia are obovate-elongated. The caudiculae are very short. The corpusculum is very small and rhombic-elongated. Rudolf Schlechter found the holotype blooming in July 1908. The flowers do not smell and stay open for about 5 days.
Geographical distribution and habitat
The range of the species is Papua New Guinea. The holotype was found there in tropical forests about 400 m above sea level.
Taxonomy
The taxon Hoya hypolasia was established by Rudolf Schlechter in 1913 . The holotype is kept in the herbarium of the Botanical Garden Berlin ( Schlechter 18075 ).
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. 153.
- Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 , p. 54.
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 , p. 69.
Individual evidence
- ^ Rudolf Schlechter: The Asclepiadaceen of German New Guinea. Botanical Yearbooks for Systematics, Plant History and Plant Geography, 50: 81-164, 1913. Online at Biodiversity Heritage Library