Hoya inconspicua

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Hoya inconspicua
Systematics
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Marsdenieae
Genre : Wax flowers ( hoya )
Type : Hoya inconspicua
Scientific name
Hoya inconspicua
Hemsl.

Hoya inconspicua is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).

features

Vegetative characteristics

The species is an epiphytic, climbing creeper that anchors itself to the ground with adventitious roots. The adventitious roots form in the internodes , directly below the nodes . The thread-like shoot axes have a diameter of 1.5 to 3 mm (up to 4 mm), are light green and only sparsely hairy. The internodes are 3 to 8 cm long, in exceptional cases up to 10 cm long. The fleshy (to leathery) leaf blades are very variable in shape; from ovate to narrow-lanceolate. The base is wedge-shaped to a point, the outer end is pointed. They measure 2.5 to 10 cm in length and 1 to 2.5 cm (1.5 to 3 cm) in width. The glossy green leaf blades are flat, smooth, and glabrous or hairy. The pinnate-shaped leaf veins are inconspicuous. The round, dark green leaf stalks are 3 to 8 mm long and 1.5 to 2 mm in diameter. They are sparsely hairy and downy. The basal colleters are short and lie close to the surface in a small concave depression.

Generative characteristics

The hanging inflorescences are umbel-shaped with up to 30 (up to 20) individual flowers, and have a flat or slightly convex flower surface. The inflorescence stalks grow positively geotropically , are 3 to 10 cm (up to 7 cm) long and only slightly hairy. The rachis becomes up to 2 cm long. The pointed, pale pink sepals measure 1 × 1 mm, and are finely haired on the outside. The corollas sit on 1 to 2.5 cm long and up to 1 mm long, bare stalks, which are short and straight in the middle of the umbel-shaped inflorescence, and are much longer and strongly curved at the edge. The petal tips are strongly rolled up, the shape of the flower is button-like. The corolla has a diameter of 7 to 8 millimeters with rolled-up tips, or 10 to 12 millimeters if the tips are spread out flat. The corolla is yellow-pink to red-brown. The corolla lobes are triangular (egg-shaped) with bent edges, 3.5 to 4.5 mm long and 2.7 to 3.2 mm wide at the base. The outer end is narrow. The outside of the tips are bald, the inside predominantly downy hairy, and becoming bald towards the tips. The hair is about 0.5 mm long. The light pink to dark purple secondary crown is 2.5 mm high and 5 to 7 mm wide. The flattened staminal lobes measure 3 to 3.5 millimeters in length and 1 to 1.4 millimeters in width. The outer extension is split in the middle at the outer end in a wedge shape, the inner extension subphrate and as high as the stamens . The pollinia are elongated, about 350 to 450 μm long and 110 to 180 μm. The extended edges ("wings") are transparent. The corpusculum (also called retinaculum) is elongated 120–130 × 60–90 μm. The caudiculae are broad-spatulate with broad wings and measure 0.16 × 0.13 mm. The flowers produce a lot of nectar that is said to taste like honey. The spindle-shaped, bare fruits are up to 10 cm long with a diameter of only about 6 millimeters.

Geographical distribution and ecology

The species occurs in New Guinea , the Solomon Islands , Australia ( Queensland ) and Vanuatu . The epiphytic, or lithophytic, climbing loops grow in the lowlands, usually along the coasts. The abundantly produced nectar attracts butterflies that drink the nectar. However, it was not observed whether they are also the pollinators.

Taxonomy

Hoya inconspicua was published by William Botting Hemsley in the Bulletin of miscellaneous information Royal Botanic Gardens, Kew 1894, p. 213. The holotype was collected by Henry Brougham Guppy in the Solomon Islands. The exact location is not known. The following are treated as synonyms:

  • Hoya dodecatheiflora Fosberg, Solomon Islands, Santa Cruz Islands Vanikoro , Tevia Bay (growing on trees), collected on May 6, 1933 by the Templeton Crocker Expedition. The holotype is in the herbarium of the Bernice P. Bishop Museum in Honolulu , Oahu , Hawaii .
  • Hoya litoralis Schltr., Papua New Guinea , Madang Province (collected on October 16, 1901 by Rudolf Schlechter ), “On trees on the beach at Potsdam Hafen” (today Monumbo). A lectotype ( Schlechter 13675 ) was only determined by Rodda & Simonsson (2013); it is in the Herbarium of the Botanical Garden, Berlin.

Hoya inconspicua was treated as a synonym of Hoya revoluta by Forster & Liddle (1992) .

supporting documents

literature

  • Paul Irwin Forster, David J. Liddle: Taxonomic studies on the genus Hoya R.Br. (Asclepiadaceae) in Papausia. 4. Typification and synonymy of Hoya revoluta Wight ex JD Hook. Austrobaylea, 3: 638-639, 1992.
  • 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 .
  • 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
  • Richard E. Rintz: The Peninsular Malaysian species of Hoya (Asclepiadaceae). Malayan Nature Journal, 30: 467-522, 1978.
  • Michele Rodda, Nadhanielle Simonsson Juhonewe: The taxonomy of Hoya micrantha and Hoya revoluta (Apocynaceae, Asclepioideae). Webbia: Journal of Plant Taxonomy anf Geography, 68 (1): 7-16, 2013 doi : 10.1080 / 00837792.2013.802937

Individual evidence

  1. ↑ a b c d e f Hoffmann, Donkelaar & Albers, Sukkulenten-Lexikon, p. 158.
  2. ↑ a b Kloppenburg & Wyman, World of Hoyas, p. 128.
  3. ^ William Botting Hemsley: Flora of the Solomon Islands. Bulletin of miscellaneous information, Royal Gardens, Kew, 1894: 211-215, London 1894. Online at www.biodiversitylibrary.org (p. 213)
  4. ^ Francis Raymond Fosberg: Melanesian Vascular Plants. In: Lloydia , 3: 109-124, 1940.
  5. ^ Rudolf Schlechter: Family Asclepiadaceae. In: Karl Schumann and Karl Lauterbach (eds.): Supplements to the flora of the German protected areas in the South Seas: excluding Samoa and the Carolines. Pp. 353–369, Leipzig, Verlag von Gebrüder Borntraeger, 1905 Online at www.biodiversitylibrary.org (p. 363/4)

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