Hoya finlaysonii

from Wikipedia, the free encyclopedia
Hoya finlaysonii
Systematics
Order : Enzianartige (Gentianales)
Family : Dog poison family (Apocynaceae)
Subfamily : Silk plants (Asclepiadoideae)
Tribe : Marsdenieae
Genre : Wax flowers ( hoya )
Type : Hoya finlaysonii
Scientific name
Hoya finlaysonii
Wight

Hoya finlaysonii is a plant of the genus of wax flowers ( Hoya ) of the subfamily of asclepiadoideae (Asclepiadoideae). The species is unique because of its leaf veins.

features

Hoya finlaysonii is a climbing, twisting plant with sturdy, pale brown shoots. The shoots have a cross-section of up to about 3 mm. The internodes are relatively long. The mostly opposite leaves are stalked, the thick petioles are 0.6 to 13 cm. The leaf blades are elliptical, up to 21 cm and 6 cm wide (15 and 5 cm; Wennström & Stenman). They are thick and leathery to rigid with raised, dark green leaf veins that protrude very prominently from the light green upper side. The underside is dark red. The base is wedge-shaped, the apex tapering to a point. The edges are wavy.

The upright inflorescence is rounded to convex on top with 35 to 40 flowers. The inflorescences are hanging or are horizontal. The inflorescence stalk is 2 to 3 cm long. The very thin and rigid flower stalks are up to 2.5 cm long and more or less brightly reddish spotted. The corolla has a diameter of 6 mm to about 10 mm and is whitish to slightly yellowish. The tips of the petals are ovate, pointed and strongly bent back. The tips of the tips are deep red and hairy on the inside, and bare on the outside. The secondary crown is glassy-white with egg-shaped tips. The outer ovoid appendages are pointed and ascending. The inner processes are short and pointed. The appendages of the anthers are rounded and short.

The pollinia are elongated-sickle-shaped and winged. The caudiculae are very short and thick. The corpusculum is conical in shape. The follicles are slender-spindle-shaped, 12 cm long and 0.6 cm in diameter. The seeds are cylindrical, 0.75 cm long.

The species can bloom all year round. The scent of the flowers is described very differently in the literature. According to Wennström and Stenman, they smell faintly of citrus. According to Kloppenburg, on the other hand, they have a sharp, spicy scent. Wayman, on the other hand, writes of ... one of the most delicious fragrances ... The flowers are very short-lived and only stay open for a day or just a little longer. The species grows relatively slowly.

Similar species

According to Surisa Somadee and Jens Kühne, Hoya finlaysonii is said to be closely related to Hoya parasitica , which is probably a mistake, as this species has no similarity. Under Hoya callistophylla is again closely related to Hoya finlaysonii . This species actually has similar flowers and leaves. In Hoya finlaysonii the corolla lobes are triangular and slightly curved upwards at the tips. According to Wanntorp et al. is Hoya finlaysonii but closely with Hoya incrassata , Hoya vitellina and Hoya vitellinoides related.

Geographical distribution and habitat

The species is widespread in Southeast Asia. The distribution area extends from Myanmar, southern Thailand, the Malay Peninsula to Indonesia (Borneo, Sumatra). The habitat is the tropical rainforest.

Taxonomy

The taxon was established by Robert Wight in his work Contributions to the Botany of India in 1834 . The holotype is kept in the herbarium at Kew Gardens (London). It is native to Penang Island , Malay Peninsula, Malaysia.

According to Wennström and Stenman, it is a very variable species or a species complex. The leaves in particular should vary from thin or non-succulent and soft to succulent and very firm.

literature

  • Christiane Hoffmann, Ruurd van Donkelaar, Focke Albers: Hoya. In: Focke Albers, Ulli Meve (Hrsg.): Succulents Lexicon Volume 3 Asclepiadaceae (silk plants) . Pp. 147-160, Ulmer, Stuttgart 2002, ISBN 3-8001-3982-0 (here p. 152).
  • Dale Kloppenburg and Ann Wayman: The World of Hoyas - a pictorial guide. A revised version. 248 pp., Orca Publishing Company, Central Point, Oregon, 2007 ISBN 0-9630489-4-5 (p. **)
  • Anders Wennström and Katarina Stenman: The Genus Hoya - Species and Cultivation. 144 p., Botanova, Umeå 2008 ISBN 978-91-633-0477-4 (p. 58)
  • Surisa Somadee and Jens Kühne: Hoya 200 different wax flowers. 96 pp., Formosa-Verlag, Witten 2011 ISBN 978-3-934733-08-4 (p. 49).

Individual evidence

  1. ↑ Ann Wayman: Hoya finlaysonii . Fraterna, 1992 (2): 11 + title page online at Biodiversity Heritage Library
  2. ↑ Livia Wanntorp, Katherina Gotthardt. Alexandra N. Muellner: Revisiting the wax plants (Hoya, Marsdenieae, Apocynaceae): Phylogenetic tree using the matK gene and psbA-trnH intergenic spacer. Taxon, 60: 4-14, 2011 Online at JSTOR .
  3. ^ Robert Wight: Contributions to the botany of India. Parbury, Allen & Co., London 1834. Online at Google Books , p. 38.

external link