Hoya anulata
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Hoya anulata is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya anulata grows epiphytically , more rarely also lithophytically on stones. The twisting, mostly bald, rarely slightly hairy shoots are cylindrical with a diameter of up to 5 mm. The pale green to bronze colored, fleshy leaves are stalked; the stem is 2 to 12 mm long with a diameter of 2 to 4 mm. The leaf blades are ovate, obovate or rhombic and up to 9 cm long and 4 cm wide. The base is heart-shaped to rounded, the apex is long pointed. The edges are bent back; the light green blades show no recognizable veins .
The hanging, umbel-shaped inflorescence consists of up to twelve flowers (10 to 16 flowers) and ends straight. The bald inflorescence stalk measures 4 to 9 mm in length and about 2 mm in diameter. The corolla is spread out in a star shape and measures up to 1.5 cm in diameter. The individual flowers sit on 16 to 25 mm long, little hairy flower stalks that have a diameter of about 1 mm. The approximately 1 mm long sepals are triangular-egg-shaped and taper to a point. The pale pink to almost white, at the base reddish corolla lobes are triangular in shape and tapering to a point. They are about 4 to 5 mm long and 5 mm wide at the base, glabrous on the outside and densely hairy on the inside. They are only slightly bent back. A characteristic ring-like thickening is formed at the base of the secondary crown (name!). The yellow, light pink to dark red secondary crown measures 6 to 7 mm in diameter and is 2 mm high. The staminal corolla lobes are oblong-linear and 3 mm long, at the base 1 to 1.5 mm wide. The outer extension is moderately pointed, the inner extension long and pointed and ascending. It is usually also darker than the outer process. The extensions of the stamens are 0.5 mm long and just as wide. The stylus head has a diameter of 1 mm. The pollinia are elongated and upright. They are 0.35 to 0.4 mm long and 0.15 mm wide. The apex is beveled slightly inwards. At the outer edge there is a transparent border that extends almost to the apex. The winged caudiculae are 0.1 to 0.13 mm long and 0.1 to 0.13 mm wide (0.1 mm long, 0.08 mm wide). The light yellow corpusculum is elongated rhombic and measures 0.13 to 0.14 mm (0.2 mm) in length and 0.06 to 0.1 mm in width. The flowers smell of coconut and produce plenty of nectar. They last about 8 days before they go away. The spindle-like follicles are 7 to 14 cm long, with a thickness of 0.7 to 1.2 cm.
Geographical distribution and habitat
The species occurs in Papua New Guinea, Indonesia and Australia. It grows there in the tropical rainforest.
Taxonomy
Hoya anulata was described for the first time in 1905 by Rudolf Schlechter in his addendum (s) to the flora of the German protected areas in the South Seas (excluding Samoa and the Carolines) on p. 362. As a type locality he indicated the upper Nuru River, "on the way from the Ramu (-River) to the coast" at about 400 m above sea level. Worse found the species blooming in February 1902.
Hoffmann, van Donkelaar and Albers give the following species as synonyms: Hoya pooriana S.Moore , Hoya poolei C.T. White & Francis , Hoya pseudolittoralis C. Norman and Hoya alata K.D. Hill .
The name is derived from the characteristic ring-like thickening at the base of the secondary crown.
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 (here p. 148).
- Paul Irwin Forster, David J. Liddle: Taxonomic studies on the genus Hoya (Asclepiadaceae) in Papuasia, 1-5. Austrobaileya, 3 (4): 627-641, 1992 JSTOR
- Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 25)
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (here p. 25)
Individual evidence
- ↑ Somadee & Kühne (2011: p. 28)
- ↑ a b Livia Wanntorp: Pollinaria of Hoya (Marsdenieae, Apocynaceae): Shedding Light on Molecular Phylogenetics. Taxon, 56) (2): 465-478, 2007 online at JSTOR
- ↑ www.simones-hoyas.de - website of Simone Merdon-Bennack: Hoya anulata Schlechter 1905
- ↑ Rudolf Schlechter: Metachlamydeae. In: Karl Schumann & Karl Lauterbach: Supplements to the flora of the German protected areas of the South Seas (excluding Samoa and the Carolines). Volume IV. 335-403, Leipzig 1905 (p. 362) online at archive.org