Hoya callistophylla
| Hoya callistophylla | ||||||||||||
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| Hoya callistophylla | ||||||||||||
| T. Green |
Hoya callistophylla is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). The species is so far only known from Sabah (Borneo, Malaysia).
features
Hoya callistophylla is a climbing climbing plant that takes root on the entwined trees. The shoots are bare and up to about 5 m long. The leaves are opposite and petiolate. The often curved petioles are 10 to 3 cm long and 5 mm in diameter. They are brownish and have a rough surface. The elliptical to lanceolate leaf blades are 15 to 25 cm long and 4 to 9 cm wide. The apex is pointed, the base wedge-shaped. They are leathery, hard and thin with a matt surface. The veins are dark green while the leaf is light green. The nerve therefore appears prominently. The 8 to 10 secondary ribs are at an angle of about 60 ° to 80 ° on the central rib. The edges are strong, sharp and somewhat irregular. When injured, shoots and leaves separate a white milky sap.
The umbel-shaped inflorescences stand upright, are hemispherical on top and contain 20 to 40 flowers. The peduncle becomes 1 to 3 cm long (at the beginning of the flower opening) with a diameter of up to 3 mm. The greenish-brownish inflorescence stalks persist, on them an inflorescence forms again in the next flowering period. The flower stalks are 1 mm in diameter and 0.5 to 2 cm long. The flat to slightly curved back corolla has a diameter of 0.8 to 1 cm. The sepals are 1 mm wide, 2 mm long and pointed. They are papilous and yellowish in color with reddish spots. The corolla lobes are ovate-triangular with a pointed apex. They are yellowish in the inner half, the outer half is red. The tips of the tips and the edges are usually a little rolled up. They are bare on the inside and outside or finely papillary. The whitish secondary crown measures 5 mm in diameter. The tips of the secondary crown are triangular, the tips are slightly curved upwards. Fruits and seeds have not yet been observed. The flowers only stay open for one day during daylight. They have a pleasant or mild fragrance. The fruits are 11 to 12 cm long with a diameter of 5 to 6 mm.
Similar Art
The species is probably more closely related to Hoya finlaysonii Wight from Penang (Malaysia), which has a similarly prominent leaf vein. However, the pattern of leaf veins differs from this species, and the corolla lobes are also triangular and slightly bent downwards at the tips.
Geographical distribution and habitat
The species is so far only known from the Malaysian states of Sabah and Sarawak and from Brunei and Kalimantan (Indonesia) on the island of Borneo . It occurs there in open dipterocarp and mountain heather rainforests on Podsolen at 300 to 600 m above sea level and in forests on ultramafic rocks up to 1000 m above sea level.
Taxonomy
The species was first described by Ted Green in 2000. The holotype is kept in the Bishop Museum, Honolulu, Oahu, Hawaii under the number Ted Green No. 201 ex hort. The original cutting came from Nabawan , Sabah (Eastern Malaysia).
The Plants of the World online database accepts Hoya callistophylla as a valid taxon.
literature
- Robert Dale Kloppenburg: Malaysian Hoya Species. A monograph. 2004 Online at Biodiversity Heritage Library
- Anthony Lamb, Michele Rodda (with contributions by Linus Gokusing, Steven Bosuang and Sri Rahayu): A Guide to the Hoyas of Borneo. Natural History Publications (Borneo), Kota Kinabalu, 2016 ISBN 978-983-812-170-5 , pp. 48/49.
- Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011, ISBN 978-3-934733-08-4 (p. 33)
Individual evidence
- ↑ a b Ted Green: Hoya callistophylla, Green sp. nov. (Asclepiadaceae). Fraterna, 13 (4): 2, 2000 Online at Biodiversity Heritage Library
- ↑ Kew Science - Plants of the World Online: Hoya calistophylla T.Green
Web links
- www.pakehas-hoya.com (pictures of the inflorescence!)