Vanilla acuminata

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Vanilla acuminata
Systematics
Order : Asparagales (Asparagales)
Family : Orchids (orchidaceae)
Subfamily : Vanilloideae
Tribe : Vanilleae
Genre : Vanilla ( vanilla )
Type : Vanilla acuminata
Scientific name
Vanilla acuminata
Rolfe

Vanilla acuminata is a species of the genus Vanilla ( Vanilla ) in the orchid family (Orchidaceae). It grows as a climbing plant in tropical Africa.

description

Vanilla acuminata is an evergreen climber with a thin, flexible stem. The leaves are at intervals of six to ten centimeters on the shoot, they are lanceolate, with a 1.5 to two centimeter long petiole at the base, ending with a long tip at the front. They are ten to 25 inches long and two to three inches wide.

The unbranched inflorescence is 2.5 to four inches long. The bracts are elongated-oval, usually only 0.2 to 0.5 centimeters in size, rarely also like leaves and up to one centimeter in size. The flowers are creamy white to yellowish. The sepals are lanceolate and 1.2 to 1.5 centimeters long; the dorsal sepal measures 3.5 to four millimeters in width, the lateral sepals are slightly wider. The also lanceolate petals remain smaller with 1.2 × 0.3 centimeters, they are keeled on the outside. The lip is three-lobed, about an inch long, in the middle with a weakly developed, brown appendage. The shape of the lip is elongated, it ends bluntly with an attached tip. The club-shaped column is 0.7 to 0.8 inches long, it is fused with the side lobes of the lip. The capsule fruit is narrow and about five centimeters long. The fruits of Vanilla acuminata ripen from May to July.

distribution

Vanilla acuminata inhabits a small area in western tropical Africa, it occurs only in Gabon and the Democratic Republic of the Congo. The sites are in the shade of damp forests.

Systematics and botanical history

Vanilla acuminata was first described by Robert Allen Rolfe in 1896 .

Within the genus Vanilla , Vanilla abundiflora is classified in the subgenus Xanata and there in the section Thethya , which contains all species of the paleotropic plants . Soto Arenas and Cribb compare them with Vanilla africana , especially strong specimens of Vanilla acuminata can hardly be distinguished from Vanilla africana . The lip, which is important for differentiation, is missing from the type specimen . According to Portères , it is similar to other African vanilla species, in addition to Vanilla africana , Vanilla cucullata and Vanilla ramosa .

literature

  • Le Vanillier et la Vanille dans le Monde . In: Gilbert Bouriquet (ed.): Encyclopédie Biologique . tape XLVI . Paul Lechevalier, Paris 1954.

Individual evidence

  1. ↑ a b c d Roland Portères: Le Genre Vanilla et ses Espèces. In: Le Vanillier et la Vanille dans le Monde. P. 201.
  2. ↑ a b Miguel A. Soto Arenas, Phillip Cribb: A new infrageneric classification and synopsis of the genus Vanilla Plum. ex Mill. (Orchidaceae: Vanillinae) . In: Lankesteriana . tape 9 , no. 3 , 2010, p. 367 ( ucr.ac.cr [PDF]).
  3. ↑ Rafaël Govaerts (ed.): Vanilla acuminata. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved May 18, 2020.
  4. ↑ In: J. Linn. Soc. (Bot.). Volume 32, 1889, p. 456.
  5. ↑ Rafaël Govaerts (ed.): Vanilla acuminata. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew .