Hoya camphorifolia
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Hoya camphorifolia is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya camphorifolia is a twisting , climbing, epiphytic plant with bare shoots. Older shoots thicken and lignify. The stalked leaves are opposite. Fresh leaves are rather leathery and thin. Older leaves become thicker, fleshier, and increasingly succulent. The bare, often slightly purple petioles are 7 mm long and 1.5 mm thick. The leaf blades are ovate-elliptical, 6 to 8 cm long and 3 to 3.5 cm wide. The base is rounded, the apex slightly pointed, the tip is curved downwards. They are green with a lighter leaf vein consisting of three slightly protruding main veins.
The umbel-shaped inflorescences , usually hanging down, are formed in the leaf axils. The inflorescence stalks are thin and 5 to 11 cm long. The top of the inflorescence is convex; it contains 20 to 40 flowers. The corolla is whitish-pink to orange-reddish. It measures about 6 mm in diameter. The sepals are lanceolate and 1 mm long. The petal lobes are triangular-egg-shaped and curved upwards. They are finely hairy on the inside. The corona is darker in color than the corolla. The tips of the secondary crown are lanceolate, with a concave top. The undersides have a wide pit. The external processes are higher than the internal, erect and pointed processes. The flowers open in the early morning and close in the evening of the same day. They then open up again the next morning and fade over the course of the day.
The pollinia are broadly ovate with an apically inwardly sloping end. They are 300 µm long and 100 µm wide. A transparent membrane extends over half the length on the outside. The corpusculum is rhomboid, short and thick. The apical part of the corpusculum has three points, the middle point is higher. The corsus pusculum measures 100 µm × 80 µm. The basal part of the corpusculum ends in two narrow, wing-shaped supports. The caudiculae (translator arms) measure 70 µm × 20 µm and also have wings. Fruits and seeds are not known.
Geographical distribution and habitat
The distribution area extends over the Philippines to Sulawesi (Indonesia). The plants grow as epiphytes on trees and hang down from the primary branches of the trees. But they also grow in the undergrowth on bushes, also in anthropogenically influenced habitats, such as bushes on the edges of plantations. Hoya camphorifolia is common from about 0 to 600 m above sea level.
Taxonomy
The taxon was first described by Otto Warburg in 1904. The holotype came from Sampaloc, Tayabas Province, Luzon, Philippines and has been lost.
The specimens that David Kleijn and Ruurd van Donkelaar from Sulawesi describe differ somewhat in that they have narrower tips of the secondary crown and more or less flatly spread out petal tips.
literature
- Robert Dale Kloppenburg, Ann Wayman: The World of Hoyas - a book of pictures. A revised version. Orca Publishing Company, Central Point, Oregon 2007, ISBN 0-9630489-4-5 (pp. 74/75)
- David Kleijn, Ruurd van Donkelaar: Notes on the taxonomy and ecology of the genus Hoya (Ascepiadaceae) in Central Sulawesi. Blumea, 46: 457-483, 2001, pp. 469-473
- Surisa Somadee and Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 34)
Individual evidence
- ↑ Livia Wanntorp: Pollinaria of Hoya (Marsdenieae, Apocynaceae): Shedding Light on Molecular Phylogenetics. Taxon, 56) (2): 465-478, 2007 online at JSTOR
Web links
- Hoya camphorifolia at Paheka's Hoyas (pictures of inflorescences and leaves)
- myhoyas.com (picture of the inflorescence)