Hoya chlorantha

Hoya chlorantha
Original illustration by Hoya chlorantha (from Rechinger (1910): plate 12)
Systematics
Order : Enzianartige (Gentianales) Family : Dog poison family (Apocynaceae) Subfamily : Silk plants (Asclepiadaceae) Tribe : Marsdenieae Genre : Wax flowers ( hoya ) Type : Hoya chlorantha
Scientific name
Hoya chlorantha
Right

Hoya chlorantha is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae).

features

Hoya chlorantha is an epiphytic , climbing plant with thin, 2 mm thick shoots. The light green leaves are stalked, the petioles are 8 to 10 mm long. The internodes are more than 10 cm long. The thick, leathery leaf blades are elliptical-lanceolate, 7 to 10 cm long and 1.5 to 2 cm wide. The apex is pointed, the base is wedge-shaped to pointed. The blades have a glossy top and bottom. The lighter leaf veins are feathery. The secondary veins (4 to 5 on each side) and the lower-order veins form a net-like network, which, like the secondary veins, is only a little more prominent on the underside of the leaf. The midrib is deepened.

The umbel-shaped inflorescence contains 12 to 25 flowers and hangs downwards. The top is only slightly arched. The inflorescence stalk is 5 to 6 cm long. The flower stalks are 3 to 4 cm long, both stalks are quite thin. The inflorescence stalks of this species only bear flowers (and possibly fruit) once and are then thrown off. New peduncle form immediately next to the stigma of the discarded peduncle. Over the years, the stigmas of the fallen inflorescence stalks develop into an elongated, nodular thickening. The shoots with new inflorescences develop axially, form a few pairs of leaves and the new inflorescence forms at the end. In the next vegetation period, the top pair of leaves creates a shoot, which in turn forms a new inflorescence. The wheel-shaped, greenish-yellow corolla has a diameter of 15 to 20 mm when spread out, and 12 mm in diameter when closed (bud). There is also said to be a variation with a brownish corolla (Somadee & Kühne). The sepals are lanceolate and ciliate on the edges. The petals are fused in the lower half. The corolla lobes are 7 mm long, triangular with a strongly bent, pointed tip. They are bald on the outside and hairy on the inside. The secondary crown is yellowish. The corolla lobes are ovate. The flowers are very fragrant.

Geographical distribution and habitat

The range of the species are the islands Upolu and Savaiʻi , Samoa . She climbs high in trees. It was found in the distribution area up to 750 meters above sea level.

Taxonomy

The taxon was described by Karl Rechinger in 1908. The types were collected by Rechinger in May 1905 (No. 356, Rechinger) and July 1905 (No. 1874, Rechinger). They are kept in the Natural History Museum Vienna . W. Arthur Whistler synonymized the taxon with Hoya betchei Schltr. Other authors have not followed him in this. Plants of the World online accepts Hoya chlorantha as a valid taxon.

literature

• Erling Christopherson: Flowering Plants of Samoa. Bernice P. Bishop Museum Bulletin 128: 1–221, 1935 PDF , here p. 189.
• Surisa Somadee, Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 37)

Individual evidence

1. ^ Karl Rechinger: Botanical and zoological results of a scientific research trip to the Samoan Islands, the New Guinea Archipelago and the Solomon Islands from March to December 1905. Memoranda of the Imperial Academy of Sciences / Mathematical-Natural Science Class, 85: 1–65, Vienna 1910 p. 334 . Plate 12 (online at Biodiversity Heritage Library)
2. ^ Karl Rechinger: Plantae novae pacificae. II. Repertorium specierum novarum regni vegetabilis, 5: 130-133, 1908. Online at Biodiversity Heritage Library , p. 131.
3. ^ W. Arthur Whistler: Notes on the flora of Samoa. Phytologia, 38 (4): 409-410, 1978. Online at Biodiversity Heritage Library
4. ↑ Kew Science - Plants of the World online: Hoya chlorantha Rech.