Hoya verticillata

Hoya verticillata
	Hoya verticillata
Systematics
Order :	Enzianartige (Gentianales)
Family :	Dog poison family (Apocynaceae)
Subfamily :	Silk plants (Asclepiadoideae)
Tribe :	Marsdenieae
Genre :	Wax flowers ( hoya )
Type :	Hoya verticillata
Scientific name
	Hoya verticillata
	( Vahl ) G. Don

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

features

Hoya verticillata is an epiphytic evergreen plant whose strong, fleshy shoots are creeping, twining or climbing. They are pale green and bare, the diameter is about 3 mm. The succulent, firm leaves sit on a 5 to 25 mm long, thick stem. The leaf blades are about 10 cm long and 4 cm wide. They are oblong-ovoid to oblong-elliptical in shape, long to short pointed, the base is rounded to broadly wedge-shaped. The blades are green with more or less clearly visible leaf veins; the surface is bare.

The upright, umbel-shaped inflorescence is rarely only 1, usually more than 40-flowered. The top of the umbel is convex, the rigid inflorescence stalk measures 3 to 5 cm in length. The flower stalks are 3 mm long, quite thin and glabrous. The sepals are oblong and end blunt. The flower has a diameter of 1.5 cm. The white petal lobes are ovate, tapering to a point and curved back. The edges are curved outwards. They are hairless inside or only slightly downy. The tips of the secondary crown are egg-shaped and pointed. The outer extension is white, the inner extension deep pink. The stamen processes are membranous and tapered to a point. The stylus head is conical-pointed. The flowers have a strong citrus scent and last for five days.

The pollinarium consists of a central corpusculum, two lateral pollinia and the connecting caudiculae ( translator arms ). The pollinia are elongated with lateral outgrowths ( wings ). The corpusculum is conical, the caudiculae are short and thick. The spindle-shaped, paired follicles are up to 12 cm long with a diameter of 0.4 cm.

Geographical distribution and habitat

Hoya verticillata occurs in India ( Assam ), Nepal , Andamans , Myanmar , Cambodia , Laos , Vietnam , Indonesia ( Borneo , Java , Sulawesi , Sumatra ), Brunei , Malaysia , Thailand and Singapore . It grows there in evergreen lowland rainforests.

Taxonomy and systematics

The taxon was first described in 1810 by Martin Vahl as Sperlingia verticillata . George Don transferred the species to the genus Hoya in 1838 . The genus Sperlingia Vahl (1810) is generally regarded as a synonym of Hoya Brown (1810) (see Veldkamp & Hansen, 1996).

There are a number of synonyms, such as Hoya parasitica (Roxburgh) Wallich ex Wight (1834), Hoya hookeriana Wight (1834), Hoya pallida Lindley (1839), Hoya albens Miller ex Steudel (1841), Hoya ridleyi King & Gamble ( 1903), Hoya parasitica var. geoffrayi Costantin (1912), Hoya parasitica var. Spirei Costantin (1912), Hoya globifera Ridley (1915), Hoya citrina Ridley (1922) (= Hoya acuta var. citrina (Ridley) DH Kent (1989 )), Hoya verticillata var. citrina (Ridley) Veldkamp (1996), Hoya amoena Bakhuizen van den Brink fil. & Backer (1950), Hoya parasitica var. Citrina Rintz (1978), Hoya parasitica var. Hendersonii Kiew (1995) = Hoya verticillata var. Hendersonii (Ridley) Veldkamp (1996), Hoya acuta Haw. (1821), Hoya bawanglingensis S.Y. He & PTLi (2009), Hoya cochinchinensis (Lour.) Schult. (1820), Hoya hellwigiana Warb. (1907), Hoya nicholsoniae F. Mueller (1866), Hoya pottsii Lindl. (1829), Hoya wibergiae Kloppenb. (2001). The species name verticillata = whorled is misleading, because the leaves are not arranged whorled.

One can distinguish between three varieties:

Hoya verticillata var. Citrina (Ridl.) Veldkamp : It occurs from Indochina to the Malay Peninsula.
Hoya verticillata var. Hendersonii (Kiev) Kloppenb. : It occurs on the Malay Peninsula.
Hoya verticillata var. Verticillata : It occurs from tropical and subtropical Asia to Samoa.

literature

Focke Albers, Ulli Meve (Hrsg.): Succulent lexicon Volume 3 Asclepiadaceae (silk plants) . Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (p. 159).
Jan Frederik Veldkamp, Bertel Hansen: New combinations under Hoya verticillata (Asclepiadaceae) and a bibliographical note on Sperlingia. Blumea, 41: 439-442, 1996 PDF
Anders Wennström and Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 132)

Individual evidence

↑ www.simones-hoyas.de - Simone Merdon-Bennack's website ( Memento from April 18, 2009 in the Internet Archive )
^ Martin Vahl: Beskrivelse over nye Plantegeslægter. Skrivter af Naturhistorie-Selskabet Kiøbenhavn, 6: 84-128, Copenhagen, 1810 Online at Google Books (p. 113) (published posthumously). vi. (1810) 112/13.
↑ George Don: A General History of the Dichlamydeous Plants: comprising complete descriptions of the different orders; together with the characters of the genera and species, and an enumeration of the cultivated varieties ... the scientific names accentuated, their etymologies explained, and the classes and orders illustrated by engravings, and preceded by introductions to the Linnaean and natural systems, and a glossary of the terms used. Volume 4, p. 128, London 1838 Online at Google Books
↑ ^a ^b ^c ^d Rafaël Govaerts (Ed.): Hoya - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 16, 2018.

[Merdon-Bennack-1] www.simones-hoyas.de - Simone Merdon-Bennack's website ( Memento from April 18, 2009 in the Internet Archive )

[Vahl-2] Martin Vahl: Beskrivelse over nye Plantegeslægter. Skrivter af Naturhistorie-Selskabet Kiøbenhavn, 6: 84-128, Copenhagen, 1810 Online at Google Books (p. 113) (published posthumously). vi. (1810) 112/13.

[Don-3] George Don: A General History of the Dichlamydeous Plants: comprising complete descriptions of the different orders; together with the characters of the genera and species, and an enumeration of the cultivated varieties ... the scientific names accentuated, their etymologies explained, and the classes and orders illustrated by engravings, and preceded by introductions to the Linnaean and natural systems, and a glossary of the terms used. Volume 4, p. 128, London 1838 Online at Google Books

[WCSP-4] Rafaël Govaerts (Ed.): Hoya - World Checklist of Selected Plant Families of the Royal Botanic Gardens, Kew. Last accessed on November 16, 2018.