Hoya Lauterbachii
| Hoya Lauterbachii | ||||||||||||
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Hoya lauterbachii (Fig. 429 from E. Gilg and K. Schumann, "Das Pflanzenreich. Hausschatz des Wissens.", Approx. 1900) |
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| Scientific name | ||||||||||||
| Hoya Lauterbachii | ||||||||||||
| K. Schum. |
Hoya lauterbachii is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). With a diameter of up to 7.5 cm, the flat, bell-shaped single flower is one of the largest single flowers in the wax flower genus.
features
Hoya lauterbachii is a perennial, climbing plant; the vegetative parts contain a white milky sap. The shoots are round in cross-section with a diameter of up to 5 mm. The indument consists of uniserially arranged hairs or stiff black bristles. The internodes are very different in length, up to a maximum of 8 cm. The leaves are stalked. The leaf blades are ovate to oblong; they are up to 13 cm long and 7.5 cm wide. The base is heart-shaped and abruptly cut off, the apex somewhat spiky. The top is fine and sparsely hairy to bald. The underside is densely hairy to bald. The top is yellowish green, light green or dark green, the bottom is lighter than the top. The leaf nerve is clearly visible and consists of up to six anastomosing secondary veins that form loops with one another. The leaf stalks are 1 to 4 mm long with a diameter of 3 to 4 mm and have a dense indument . Two nectar glands (nectaria) sit at the transition from the petiole to the leaf blade .
The hanging or downwardly curved inflorescences contain one to eight flowers. The shafts of the inflorescences are 4.5 cm long, with a diameter of 4 to 6 mm. They are green and have a dense indument. The five-fold, zygomorphic flowers have a double flower envelope and are hermaphroditic . The corolla has a diameter of up to 7.5 cm. The flowers sit on 2 to 3.5 cm long and 2 to 3 mm thick pedicels with a dense indument. The yellowish-green sepals are lanceolate-ovate to ovate, 5 to 7 mm long and 2 to 4 mm wide, each with a gland in the sinus between the sepals. The petals are largely fused laterally ( sympetalie ), the flower broadly bell-shaped or broad-calyx-shaped and about 1 cm long (high). At the outer edge of the "bell" there are only five short wedge-shaped notches and small triangular tips. The tip and edge of the bell are curved outwards; the tips can also be stretched out horizontally or bent slightly inward. They are 8 to 15 mm long (high) and 12 to 17 mm wide. It is finely hairy on the inside with white hair. The petals are very variable in color; the variation ranges from deep red, red, brown, pink, yellow or yellow with pink stripes that alternate with the corolla lobes. The staminale secondary crown sits on a 3 mm high stem, which has a diameter of 0.8 to 1.5 mm. The tips of the secondary crown are egg-shaped and end broadly pointed. The top is slightly indented. The inner process is pointed like a beak. They are 4 to 5 mm long and 2.5 to 4 mm wide. They are yellowish with a different colored border; this color vary with the same width as the petals. The fruits are 14 to 16 cm long and 3 cm in diameter. The seeds are elongated, 7 to 8 mm long and 2 to 3 mm wide. The white head of hair is 18-20 mm long.
Geographical distribution and habitat
The species occurs in New Guinea ( Papua New Guinea and West New Guinea ), Solomon Islands , and in Northern Australia ( Queensland ).
Taxonomy
The taxon was first described by Klaus Moritz Schumann in 1896. The holotype ( C. Lauterbach 930 ) was collected on November 10, 1890 by Carl Lauterbach on the middle reaches of the Gogol River as part of the Gogol Expedition in Papua New Guinea. It was kept in the herbarium of the Botanical Museum in Berlin and burned during World War II. The taxon is accepted as a valid species by the Plants of the World database online .
A synonym is: Hoya coronaria var. Papuana Bailey.
literature
- Paul Irwin Forster: Hoya R. Br. (Asclepiadaceae) in Australia - an alternative classification. Austrobaileya, 3 (2): 217-234, 1990
- Klaus Moritz Schumann: Hoya Lauterbachii K.Sch., A new wax flower. Monthly for Kakteenkunde, 6: 7–8, + illustration p. 9, 1896 Online at www.biodiversitylibrary.org
Individual evidence
- ^ Website on the genus Hoya by Simone Merdon-Bennack
- ↑ Kew Science - Plants of the World online: Hoya Lauterbachii K.Schum.
Web links
- Tucson Cactus and Succulent Society "An Introduction to the Hoyas and Dischidias" Presented by Ted Green (picture of an inflorescence, Ted Green as size comparison)
- www.pinterest.com (inflorescence)