Hoya chinghungensis

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Hoya chinghungensis
Systematics
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Marsdenieae
Genre : Wax flowers ( hoya )
Type : Hoya chinghungensis
Scientific name
Hoya chinghungensis
( Tsiang & PTLi ) MGGilbert & PTLi & WDStevens

Hoya chinghungensis (Ch.景洪球兰Jing hong Qiu lan) is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). It occurs in southern China and Myanmar.

features

Hoya chinghungensis grows pendulous epiphytically; the downy, hairy shoots are up to 2 m long and branch predominantly at the base. The leaves have short, about 1.5 mm long, downy hairy stems. The lush green leaf blades are broad-egg-shaped to rounded-triangular 1 to 1.5 cm long and 0.7 to 1.1 cm wide. The base is rounded to straight, the outer end tapering to a point. The central vein can be seen, the lateral veins are obsolete.

The terminal inflorescence is 4 to 5-flowered (4 to 7-flowered) and drooping. The stalks of the inflorescence are very short (shorter than the flower stalks), often they are even absent. Three to four (six) individual flowers are grouped around a central flower. The flower stalks vary in length from 0.8 to 1.2 cm. The single flower has a diameter of about 1 to 1.2 (1.3) cm. The densely hairy sepals are more or less egg-shaped, 1.5 to 2 mm long and about 1.2 mm wide. The outer end is blunt. The corolla is white and star-shaped, or with slightly curved corolla lobes. These are triangular-ovoid, approx. 3.5 long and 4.5 mm wide at the base with a slightly rounded apex. They are bald on the outside and very finely hairy on the inside. The secondary corolla are glassy pink and triangular. The outer extension is pointed, the inner extension lies against the stamen and reaches the extensions of the stamens. These overlap slightly in the center above the stylus head. The oblong-lanceolate Pollinia are 0.4 to 0.5 mm long and approx. 0.2 mm wide and light yellow. The hanging follicles are narrow-spindle 7 to 9 cm long, with a diameter of 3 to 4 mm; the surface is smooth. The seeds are elongated about 2.5 mm and 0.3 mm thick. The white head of hair measures approx. 2 cm. The species blooms in its natural habitat in June and produces fruits from July to October.

Similar species

Hoya chinghungensis is closely related to Hoya bella , Hoya lanceolata and Hoya engleriana . The leaves are smaller than those of these species. The corolla lobes are also more bent back than in the other three species.

Geographical distribution and habitat

The species occurs in the south of the province of Yunnan (southern China), in Myanmar and Thailand (near the Tee Lao Su waterfall, Mae Sod district, Tak province, near the border with Myanmar). It grows in dense forests at 1500 to 2000 m above sea level.

Taxonomy

The species was originally described as Dischidia chinghungensis by Ying Tsiang and Ping-tao Li in 1974 . It was founded in 1995 by Michael Gilbert et al. reclassified and placed in the genus Hoya . The holotype was collected in September 1936 by CW Wan at Che-li Hsien, Meng-soong, Dah-Meng-Lung (Yunnan, China) at 1900 m above sea level. Gilbert et al. (1995) suggest the possibility that Hoya bella and Hoya chinghungensis are merely subspecies of Hoya lanceolata . However, the Flora of China treats Hoya chinghungensis again as a separate species, as does Somadee & Kühne (2011).

literature

  • Michael G. Gilbert, WD Stevens & Li Ping-tao: Notes on the Asclepiadaceae of China. Novon, 5 (1): 1-16, 1995 online at JSTOR
  • Surisa Somadee and Jens Kühne: Hoya 200 different wax flowers. 96 p., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 36)

Individual evidence

  1. ↑ Somadee & Kühne (2011: p. 36)
  2. ↑ Hoya chinghungensis - Flora of China

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