Hoya parviflora
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| Wight |
Hoya parviflora is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). With a diameter of only 3 to 5 mm, the flowers of Hoya parviflora (name! Small-flowered) are among the smallest flowers in the genus Hoya .
features
Hoya parviflora is a perennial , climbing plant with twisting shoots. The thin shoots are round in cross-section, about 1 mm in diameter, fresh shoots are often reddish. It attaches itself to branches and trees with fine adhesive roots that arise above the leaf nodes. The opposite, dark green leaves are stalked, the thick stalks are up to 4 mm long. The fleshy leaf blades are lanceolate, 6 to 11.5 cm long and 1 to 2.2 cm wide and glabrous. Base and apex are pointed. The slightly darker edges are slightly bent back. Some shapes also have silver spots. the midrib thin and not very pronounced. The leaf veins are barely recognizable. There are 5 to 6 pairs of secondary ribs starting at an acute angle (approximately 10 °) from the central rib.,
The umbel-shaped inflorescence arises from the internodes or is terminal. It usually contains 35 to 40 flowers. The surface is concave and hangs down. The thick, stiff, and persistent inflorescence stalk is curved back and 4.4 to 5.1 cm long. The thin flower stalks are curved and 0.3 to 3 cm long. The sepals are very small, ovate and membranous. The white, pink to light pink corolla is button-shaped with a diameter of 3 to 5 mm. It is covered with coarse hair on the inside at the base. The petal lobes are triangular and strongly bent back. The secondary crown is broadly conical. The tips of the secondary crown are inverted-egg-shaped or inverted-heart-shaped and folded lengthways. The outer extension is in three parts, the inner extension is pointed. The anther process is very thin and membranous. The stylus head is conical. The flower smells strongly sweet like perfume.
The pollinia are elongated and sloping inward at the apex. They are 275 µm long and about 140 µm wide. They are flat and winged on the outside. The wings are narrow, becoming wider towards the base. The caudiculae are short club-shaped, about 90 µm long and winged. The wings are approx. 190 µm long and start in the lower half of the corpusculum. The corpusculum is elongated triangular. The base ends in an obtuse-angled base, the apex ends at an acute angle. The spindle-shaped follicle fruit is 11.5 to 16 long and has a diameter of 0.6 cm. The fruit shell is thin, the outside is smooth. The smooth seed is elongated, about 7 mm long and pale brown. The head of hair is 2.5 cm long and white.
Geographical distribution and habitat
The distribution area of the species extends from Myanmar and Thailand to the Malay Peninsula (Malaysia) and Sumatra (Indonesia). It occurs there in lowland rainforests. It was found in bloom in November in its natural habitat on the Malay Peninsula.
Taxonomy
The taxon was first described by Robert Wight in 1834 in his work Contributions to the Botany of India (p. 37). Rahayu & Rodda (2019) identified the specimen Wallich 8156A in the Kew Gardens herbarium as the lectotype .
A more recent synonym is Hoya variifolia Ridl. (1926). The type material comes from Sipora, Sumatra.
literature
- Christiane Hoffmann, Ruurd van Donkelaar, Focke Albers: Hoya. In: Focke Albers, Ulli Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 147-160, Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 , p. 157.
- George King, J. Sykes Gamble: Materials for a Flora of the Malayan Pensinsula. Journal and Proceedings of the Asiatic Society of Bengal, 74 (2): 387-728, 1908 Online at Biodiversity Heritage Library , p. 576.
- Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 , p. 72,
- Anders Wennström, Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 , p. 108,
Individual evidence
- ↑ a b Sri Rahayu, Michele Rodda: Hoya of Sumatra, an updated checklist, three new species, and a new subspecies. European Journal of Taxonomy, 508: 1–23 doi : 10.5852 / ejt.2019.508
- ^ Robert Wight: Contributions to the botany of India. Parbury, Allen & Co., London 1834. Online at Google Books , p. 37.