Hoya macgillivrayi

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Hoya macgillivrayi
Hoya macgillivrayi, inflorescence

Hoya macgillivrayi , inflorescence

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

Hoya Macgillivrayi is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). The species is endemic to the Iron and McIlwraith Ranges of the eastern Cape York Peninsula in the north of the Australian state of Queensland . The specific epithet honors the physician and scientist William David Kerr Macgillivray (1867–1933).

features

Hoya macgillivrayi is an epiphytic , seldom growing, twisting plant with cylindrical, bare shoots measuring 5 mm in diameter. All parts of the plant contain a white milky sap . The egg-shaped to lanceolate leaf blades sit on a 2 to 3.5 cm long and 2 to 5 mm thick stalk. The base of the leaf blade is heart-shaped, the outer end pointed. They measure 15 to 20 cm in length and 2.5 to 8 cm in width. The leaves are opposite, glabrous and succulent. Young leaves are copper-colored, older leaves are dark green. The internodes measure about 20 cm.

The inflorescence contains up to 12 individual flowers (6 to 10). It forms at the internodes. The green to yellowish inflorescence stalks are 4 to 20 cm long and 1 to 2 millimeters thick. The cup-shaped flowers are 5.5 to 8 cm in diameter. They sit on 5.4 to 8.5 mm long, green, bare stems. The sepals are pointed, 3 to 4 mm long and about 2 mm wide at the base. The flowers are uniformly dark red or white in the center. The petal lobes are 2 to 2.5 cm long and 1.9 to 2.3 mm wide. They run out to a point, the edges are strongly bent. The secondary crown is about 1.8 to 2.4 cm in diameter and about 1 cm high. She is dark red and bald. The staminal corolla lobes are 10 to 12 mm long and 2 to 3 mm wide. The inner, pointed process is 5 - 10 mm long and ascending. The outer process is papular to pointed and only slightly ascending. The extensions of the stamens are 2.5 mm long and pointed. The stylus head measures approx. 3 mm in diameter. The elongated pollinia measure 1.4 mm in length and 0.45 mm in width. The corpusculum has the dimensions: 0.8 mm length, 0.5 mm width; the caudiculae measure 0.4 mm in length and 0.2 mm in width. The flowers have an intense scent and last about ten days. The paired fruits hang and are 15 to 19 cm long (up to 25 cm) and have a diameter of 1.5 cm.

Similar species

Hoya macgillvrayi is closely related to three species: Hoya archboldiana C. Norman, Hoya megalaster Warburg and Hoya onychoides PI Forster DJ Liddle & IM Liddle from New Guinea. All four species have very large flowers, but they differ somewhat in terms of the size and shape of the flowers.

Geographical distribution and habitat

The species is endemic to the Iron Range McIlwraith Range (National Park) of the Cape York Peninsula in the north of the Australian state of Queensland . In the monsoon rainforests there, it climbs into the canopy or into trees along open streams.

Taxonomy

Hoya macgillivrayi was published in 1914 by Frederick Manson Bailey (1827-1915) in the Queensland Agricultural Journal , New Series, Volume, p. 190 for the first time. The Claudie River near its confluence with Lloyd Bay (Queensland, Australia) was specified as the type locality . The type specimen was from the doctor Dr. William David Kerr Macgillivray. Synonyms are not known. Its spectacular flowers are among the largest in the wax flower genus. It has been in cultivation for some time, and a number of cultivars are commercially available in addition to some naturally occurring clones.

supporting documents

literature

  • Focke Albers, Ulli Meve (Hrsg.): Succulent lexicon Volume 3 Asclepiadaceae (silk plants) . Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (p. 155).
  • Anders Wennström and Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 90)
  • David Liddle: Preliminary observations on Hoya and Dischidia (Asclepiadaceae) in Australia. In: Paul Forster (Ed.): Hoya in Australia. Pp. 2–37, 1987 (pp. 18, 22)

Individual evidence

  1. ↑ a b c Hoya macgillivrayi on the website of the Australian National Botanic Gardens
  2. ↑ a b c d e f Website of Simone Merdon-Bennack ( Memento from April 11, 2005 in the Internet Archive )
  3. ↑ growinghoyas.com - website of Jeanette Karlsen

Web links