Hoya onychoides
| Hoya onychoides | ||||||||||||
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| Scientific name | ||||||||||||
| Hoya onychoides | ||||||||||||
| PIForst. , DJLiddle & IMLiddle |
Hoya onychoides is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya onychoides is an epiphytic , twisting , climbing plant with densely leafed shoots. The several meters long, bare shoots have a diameter of up to 5 mm. The internodes are up to 120 mm long. The shoots are somewhat thickened under the leaf bases. The pendulous, opposite leaves are stalked, the stems are 18 to 22 mm long, 4 to 5 mm thick and have a longitudinal groove on the upper side. The succulent leaf blades are lanceolate-egg-shaped, up to 12 cm long and a little below the middle up to 5.5 cm wide (18 cm long, 7 cm wide). The base is rounded to slightly heart-shaped, the apex is drawn out pointed. The top and bottom are bare, the top is dark green, the bottom is a little lighter green. There are glands at the base. The leaf veins are only indistinct. There are 3 or 4 glands on the leaf bases. All vegetative parts secrete a white milky juice when injured.
The umbel-shaped, hanging inflorescence contains up to 3 to 7 flowers and is up to 17 cm long. The inflorescence stalks are up to 8 to 13 cm long, 3 mm thick and glabrous. The flower stalks are about 4.5 to 6 cm long, 1 to 2 mm thick and glabrous. The sepals are lanceolate-ovate to ovate, 3.5 to 5.6 mm long and 2.6 to 3.2 mm wide, and glabrous. The corolla has a diameter of 3.2 to 4.5 cm, and is 2.5 to 2.7 cm long or high. It is continuously red or pink or red / pink with a white center. The inside and outside are bare except for an area with some trichomes at the base of the corolla and the base of the corolla. The stem is 10 to 13 mm long and 20 to 30 mm in diameter. The petals are fused together in the basal half. The triangular to lanceolate petal tips are 18 to 32 mm long, 15 to 18 mm wide and curved upwards, the tips are even curved towards the center. The edges are bent back. This gives the petal tips a claw-like or claw-like appearance (name!). The staminal secondary crown is dark red to pink, 17 mm long (high) and has a diameter of 11 mm. The corolla lobes are 12 to 13 mm long and 2 to 2.2 mm wide. The inner process is lanceolate, elongated and ascending, the outer process bluntly tapering. The appendages of the anthers are lanceolate. The stylus head is conical-rounded with a diameter of 1.9 to 2 mm. The Pollinaria are 1.85 to 1.9 mm long and 1.15 to 1.2 mm wide. The Pollinia are narrow-elongated 180 to 185 µm long, 50 to 52 µm wide with a hyaline outer edge. The corpusculum is rhombic-elongated, 70 to 75 µm long, 38 to 40 µm wide. The caudiculae are 40 to 45 mm long and 15 to 20 µm wide; they start in the upper, broad part of the corpusculum. Fruits and seeds were not observed.
Geographical distribution and habitat
The species has so far been found in the Milne Bay Province and the Morobe Province in Papua New Guinea. The habitat where the original plant grew is not known (tropical rainforest).
Taxonomy
The taxon was described in 1995 by Paul Irwin Forster , David J. Liddle and Iris M. Liddle . The type plant was originally collected on the Lae-Boana road in the Morobe Province of Papua New Guinea and cultivated in Emerald Creek, Mareeba, Queensland. The holotype comes from this plant and is stored under Oct 1990, DJ Liddle IML559 in the Queensland Herbarium in Brisbane, Queensland (Australia) (2 dried herbarium leaves and one alcohol sample). Also in the Queensland Herbarium is a specimen obtained in September 1930 by Turner in Fife Bay, Milne Bay Province. Papua New Guinea was collected. The specific epithet is derived from the Greek onyx (claw) and -oides (similar) and refers to the claw-shaped petal tips. The Plants of the World online database accepts the species as a valid taxon.
literature
- Paul Irwin Forster, David J. Liddle, Iris M. Liddle: Taxonomic studies on the genus Hoya R.Br. (Asclepiadaceae: Marsdenieae) in Papuasia, 7. Austrobaileya, 4 (3): 401-406, 1995 JSTOR
- 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 (p. 192)
Individual evidence
- ↑ Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 105)
- ↑ Kew Science - Plants of the World Online: Hoya onychoides PIForst, Liddle & IMLiddle.