Hoya burtoniae
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| Hoya burtoniae | ||||||||||||
| Kloppenb. |
Hoya burtoniae is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya burtoniae is a relatively small, compact, epiphytic , climbing plant. The green, only sparsely branched shoots are finely hairy and finely dotted under the hair. The internodes are 3.0 to 3.5 cm long with thickened nodes, on which short aerial roots are often formed. In these areas, the shoots are brownish and corky. The thick and fleshy leaves are stalked, the stiff and curved petioles are hairy and relatively short and thin, only 0.5 cm long with a diameter of 0.2 to 0.3 cm. The leaf blades are egg-shaped, usually up to 3 cm long and 2 cm wide. Plants that are in the shade often have longer leaf blades. The base is wedge-shaped, the apex is pointed. The leaves are deep green on top, often with a lighter stripe along the midrib, which is barely visible. The edges are curved downwards, the top is slightly arched, the bottom is slightly concave. Top and bottom are densely hairy downy. The leaf veins do not emerge.
The inflorescences arise from the leaf axils or are terminal; they hang down. They contain around 15 to 20 individual flowers. The stiff inflorescence stalks are 3 cm long, rigid and have an enlarged rachis. The flower stalks are 1.2 to 2.2 cm long and curved. The sepals are egg-shaped and 0.12 cm long. The apex is blunt and they are downy hairy. The tips of the petals are strongly bent back, quasi rolled up and give the flower a spherical appearance with a point (secondary crown). The corolla therefore has a diameter of only 4 mm, with spread tips of about 1.1 cm. The tips are fused at the base, the free tips are egg-shaped, 0.5 cm wide and about 0.5 cm long. They are bald on the outside, downy hairy on the inside; the exception is a triangular area at the tip of the tip. The apices are sharpened, the secondary crown extends beyond the corolla slightly in diameter. The corolla lobes are narrow-elliptical. The outer process is split at the apex (bilobat). The end of the inner extension curves over the stylus head, the tips curve slightly outwards. The underside is partly guttural. The pollinia are keeled on the outer edge. The upper half of the corpusculum is constricted. It has an obtuse-angled point at the top and two long points at the bottom. Transparent membranes are applied at the edge. The caudiculae start in the area of the constriction on the corpusculum. They have large wings. The spindle-shaped fruits are 10 to 15 cm long. The flowers smell intensely of warm honey.
Geographical distribution and habitat
The range of the species is limited to the former Montalban, today Rodriguez , province of Rizal , Luzon , Philippines.
Taxonomy
The taxon Hoya burtoniae was described by Robert Dale Kloppenburg in 1990. The taxon was originally discovered from herbarium in the herbarium of the University of California at Berkeley. This material had been collected by August Loher at Montalban in the province of Rizal, island of Luzon, Philippines and had found its way into the herbarium in Berkeley. The species was later discovered among commercially distributed plants. These plants come from a plant in the Manila Memorial Garden. This original plant was later destroyed.
The species is part of the Acanthostemma section of the genus Hoya R.Br. posed. The taxon is recognized as a valid taxon by the Plants of the World online database .
literature
- Robert Dale Kloppenburg: Philippine Hoya Species. A monograph. Orca Publishing Co., Medford, Oregon, 2004 Online at Biodiversity Heritage Library , pp. 33/34.
- 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. 70/71)
Individual evidence
- ^ Website on the genus Hoya by Simone Merdon-Bennack
- ^ Robert Dale Kloppenburg: Hoya burtoniae Kloppenburg . The Hoyan, 12 (1 pt.2): pp. I 1990.
- ↑ Kew Science - Plants of the World online: Hoya burtoniae Kloppenb.