Hoya brevialata
| Hoya brevialata | ||||||||||||
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| Hoya brevialata | ||||||||||||
| Kleijn & Donkelaar |
Hoya brevialata is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).
features
Hoya brevialata is an epiphytic , climbing plant with thin, meter-long shoots. The shoots are glabrous with short internodes. The leaves are stalked, the petioles are curved and 0.5 to 1 cm long. The leaf blades are approximately rounded to elliptical, up to about 2 to 3.2 cm long and 2 to 3.2 cm wide. They are light green, but also yellowish to red when exposed to direct sunlight. The leaf veins are not visible.
The umbel-shaped inflorescences have a diameter of 3 to 6 cm and are concave on top. The terminal inflorescences hang down, and contain 15 to 25 flowers per inflorescence. The inflorescence stalks are 3 to 6 cm long. The color of the corolla ranges from almost white to deep red. The side crown is usually a little darker. The petal tips are completely turned back and give the flower a button-like appearance. The diameter of the corolla is therefore only 5 to 6 mm. The petal lobes are bare inside and out. The corolla lobes do not quite reach the sinuses, which are formed by the corolla lobes that have grown together at the base. The top of the corolla lobes is keeled. The inner appendages are blunt and curved upwards, and meet in the middle above the stylus head. The outer process is pointed. The Pollinia are 370 µm long and 125 µm wide. They are bevelled strongly inwards at the top. The outer edge is reinforced like a keel. The corpusculum is 160 µm long and constricted in the upper half. The head and hips are approx. 75 µm wide. The waist is approx. 30 µm wide. The outside winged caudiculae are about 80 µm long and strongly curved. They start at the waist of the corpusculum.
Geographical distribution and habitat
The species occurs on the island of Sulawesi (Indonesia) in the tropical lowland rainforests, but increases to about 600 meters above sea level. They are also found there in agricultural areas. The plants are often associated with ants (mostly Iridomyrmex cordatus ). They germinate from ant nests and attach themselves to the bark of trees with adhesive roots, often and very conspicuously in fruit and ornamental trees in gardens, in plantations on clove trees ( Syzygium aromaticum ) or simply in street trees. In natural habitats they are less noticeable, but still very common, especially along rivers and lakes where they inhabit all kinds and sizes of trees.
Taxonomy
The taxon was described by David Kleijn and Ruurd van Donkelaar in 2001. The holotype IPPS 8836 is kept in the Naturalis in Leiden , the Netherlands. He came from a clove plantation near Tentena, Sulawesi Tengah , Indonesia. The species name brevialata refers to the typically short anthers wing, from Latin brevis = short and Latin ala = wing. The taxon is accepted as a valid taxon by the Plants of the World online database .
literature
- 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, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 32, probably not Hoya brevialata, since the tips of the petals are densely covered with hairs)
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 33, the corolla in this picture is also very hairy on the inside)