Tanquana

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Tanquana
Tanquana prismatica

Tanquana prismatica

Systematics
Eudicotyledons
Nuclear eudicotyledons
Order : Clove-like (Caryophyllales)
Family : Midday flowers (Aizoaceae)
Subfamily : Ruschioideae
Genre : Tanquana
Scientific name
Tanquana
HEKHartmann & Liede

Tanquana is a genus of plants fromthe afternoon flower family (Aizoaceae). The botanical name refers to the Tanqua- Karoo , the main distribution area of ​​the plants.

description

The plants of the genus Tanquana grow compact and can be sunk into the ground. They cannot be branched ( Tanquana hilmarii ) or branched and survive during the resting phase with a single pair of leaves. The thick leaves of a pair of leaves are uneven and end in rounded tips. They have a smooth, bright green to purple surface. Due to the idioblasts located below the crystal-free outer epidermis wall , which are plant cells that differ significantly in shape from the surrounding cells, the leaves look spotted.

The flower stands individually above the bracts . The calyx is four to five lobed. Your 30 to 70  petals are colored yellow. The stamens are papillary at the base . In their homeland, the flowering period extends from around April to May. The strongly fragrant flowers open in the afternoon and close again in the evening.

The light brown fruits , funnel-shaped at the base, reach a diameter of up to 10 millimeters and are similar to those of the genus Titanopsis . The nine to ten compartment capsules have tiny endocarpic closing bodies . The light brown seeds are less than 1 millimeter long. Their outer seed coat (testa) has slightly raised cells.

Systematics and distribution

The distribution area of ​​the genus Tanquana is in the central part of the South African province of Western Cape . It extends over the Tanqua- Karoo and Great Karoo to the south of the Little Karoo near Laingsburg . The plants grow on Dwyka - and Ecca - shale near the southeastern border of the winter rainfall region with an annual rainfall of less than 200 millimeters.

The first description was made in 1986 by Heidrun Hartmann (* 1942) and Sigrid Liede (* 1957). The type species is Tanquana archeri . According to Hartmann (2001), the genus includes the following species:

The genus Tanquana is often still regarded as part of the genus Pleiospilos . They differ from the genus Pleiospilos by the non-keeled leaves and the much smaller, convex seed capsules only have tiny closing bodies.

Tanquana hilmarii can easily be taken for a species of the genus Lithops and was initially associated with this genus by its discoverer Hilmar Lückhoff.

proof

literature

  • PS Green, Klaus Kubitzki, E. Götz, KU Kramer: The Families and Genera of Vascular Plants . Volume 1, p. 59, Springer, 1990, ISBN 3540555099
  • Heidrun EK Hartmann: Illustrated Handbook of Succulent Plants: Aizoaceae AZ , Springer Verlag, Berlin / Heidelberg / New York 2001, p. 315, ISBN 3-540-41691-9
  • Gideon Smith et al. a .: Mesembs of the World: Illustrated Guide to a Remarkable Succulent Group . Briza Publications 1998, pp. 128-129. ISBN 1-875093-13-3

Individual evidence

  1. ↑ HEK Hartmann, S. Liede: The genus Pleiospilos s. Latin (Mesembryanthemaceae) In: Botanical yearbooks for systematics, plant history and plant geography . Volume 106, No. 4, p. 479, Leipzig 1986
  2. Jump up ↑ Heidrun EK Hartmann: Illustrated Handbook of Succulent Plants: Aizoaceae AZ , Springer Verlag, Berlin / Heidelberg / New York 2001, p. 315

Web links

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