Hoya pottsii

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Hoya pottsii
Hoya pottsii, Habitus (from Curtis Botanical Magazine, Vol. 62, Plate 3425)

Hoya pottsii , Habitus (from Curtis Botanical Magazine, Vol. 62, Plate 3425)

Systematics
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Marsdenieae
Genre : Wax flowers ( hoya )
Type : Hoya pottsii
Scientific name
Hoya pottsii
J. Trail

Hoya pottsii (Ch.铁草鞋mai san Qiu lan) is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). The distribution area is limited to southern China and Taiwan.

features

Hoya pottsii has bare, branched, twisting shoots that can be up to 4 m long and more. They are round in cross-section with a diameter of 3 to 4 millimeters. The leaves are stalked, the very thick, round stems are 2 to 2.5 cm long. The leaf blades are (inverted) heart-shaped, ovate, oblong-ovate to lanceolate with a heart-shaped, rounded, wedge-shaped to triangular base and a pointed apex. They are leathery to fleshy, pale green on top and dark green on the underside. The relatively very large leaf blades are 5 to 20 cm long (6 to 12 cm), with a width of 5 to 10 cm (3 to 6 cm). The edges are slightly bent back.

The spherical inflorescence has up to 25 individual flowers; it does not arise in the leaf axils . The stalk of the inflorescence is 5 to 8 cm long (up to 10 cm) long, relatively thin and hairless. The sepals are broadly ovate, 1.5 mm long and 0.8 mm wide and thus relatively short. The corolla is spread out like a star with slightly bent back corolla lobes and measures about 1 cm in diameter. The pale yellowish green to white corolla lobes are broadly ovate and pointed at the outer end. They are bare on the outside and faintly covered with tiny, downy hairs on the inside. The side crown is white, spread out in a star shape with a yellowish to slightly reddish center. The staminal corolla lobes are egg-shaped and sunk in the middle. The outer processes are elongated and pointed. The edges are strongly bent back and thus enclose a cavity. The inner processes are pointed and meet over the stylus head . The follicles are long spindle-shaped with a length of 11 cm and a thickness of 0.8 cm. The seeds are elongated-lanceolate in plan view, approx. 4 mm long and 1 mm wide and provided with an approx. 3.5 cm long head of hair. The flowering time at the natural site is from April to May. The fruits ripen from August to October. While Wennström and Stenman write that the species has little or no scent, the description in Curtis Botanical Magazine already speaks of a scent of old and bad honey.

Geographical distribution and habitat

The geographical distribution of the species depends on whether Hoya nicholsoniae is recognized as a synonym of Hoya pottsii or not. While Forster & Liddle (1992) see the two species as synonyms, Hoya pottsii and Hoya nicholsoniae are listed as independent species in the succulent lexicon . The "Flora of China" also lists the two species separately. The latter view is followed here. Thus the distribution area of Hoya pottsii is limited to southern China (Prov. Guangdong , Guangxi , Hainan , Yunnan ) and Taiwan . The species grows there in dense forests on tree stumps and rocks from sea level to 500 m above sea level.

Taxonomy

Hoya pottsii was first described in 1827 by James Traill in Volume 7 of the Transactions of the Horticultural Society of London, p. 25. The date of publication of this volume is given differently in the Succulents Lexicon and in the International Plant Names Index (1827 vs. 1830). Generally accepted synonyms are Hoya angustifolia Traill (1830), Hoya trinervis Traill (1830) and Hoya obscurinervia Merrill (1923). Forster & Liddle (1992) consider Hoya nicholsoniae (and Hoya hellwigiana Warb. And Hoya sogerenesis S. Moore) to be synonymous (s) of Hoya pottsii . Hoffmann, van Donkelaar and Albers in the succulent lexicon treat Hoya pottsi and Hoya nicholsoniae as separate species again.

The type specimen was brought to England from the area around Macau by John Potts in August 1822 . The plant bloomed for the first time in the spring of 1825 and was named in honor of John Potts, who had since passed away.

supporting documents

literature

  • Focke Albers, Ulli Meve (Hrsg.): Succulent lexicon Volume 3 Asclepiadaceae (silk plants) . Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (p. 157/8).
  • Anders Wennström and Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 112)

Individual evidence

  1. ↑ a b c Flora of China, vol. 16, p.230 - Hoya pottsii
  2. ^ Forster, PI, & Liddle, DJ (1992): Taxonomic studies on the genus Hoya R. Br. (Asclepiadaceae: Marsdeniae) in Papuasia, 1-5. Austrobaileya 3: 627-641.

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