Discocactus

from Wikipedia, the free encyclopedia
Discocactus
Discocactus horstii

Discocactus horstii

Systematics
Nuclear eudicotyledons
Order : Clove-like (Caryophyllales)
Family : Cactus family (Cactaceae)
Subfamily : Cactoideae
Tribe : Trichocereeae
Genre : Discocactus
Scientific name
Discocactus
Whistle.
Discocactus fariae-peresii with many ribs, near Brasilia, at the type site
Discocactus placentiformis Diamantina
Discocactus zehntneri ssp. araneispinus
Discocactus bahiensis ssp. subviridigriseus , in the habitat, Sobradinho
Discocactus horstii , in the habitat, Grao Mogol
Discocactus heptacanthus , south of Cuiaba
Discocactus pseudoinsignis , Grao Mogol
Discocactus ferricola , Corumba

Discocactus is a genus of plants inthe cactus family (Cactaceae). The botanical name is derived from the Greek noun "δίσκος" (discos) for discus in the sense of flat and refers to the flattened, discus-like shape of the plants.

description

The species of the genus Discocactus are pressed-spherical to spherical and usually individually growing plants, with mostly numerous ribs, somewhat broadened at the base, and well-developed warts. The areoles are usually covered by mostly strong thorns . The terminal, up to 4 centimeters high cephalium is somewhat depressed. It consists of white, yellowish to grayish white wool and can have bristle thorns.

The fragrant, white, funnel-shaped or tray-shaped flowers arise on the edge of the cephalium and open at night. Your pericarpel, which is bare at the base, is covered with scales further up. There is no wool or hair . The slender flower tube is also covered with scales.

The spherical to club-shaped to elongated, white to pink to bright red fruits are glabrous and slightly fleshy. They open at a vertical gap and have a perennial remnant of flowers. The fruits contain broadly oval to almost spherical, glossy black seeds that are 2 to 2.5 millimeters long.

Systematics and distribution

Discocactus is common in Brazil , eastern Bolivia, and northern Paraguay .

The first description of the genus was made in 1837 by Ludwig Georg Karl Pfeiffer . The type species of the genus is Discocactus insignis . The genus includes the following species:

A synonym of the genus is Neodiscocactus Y.Itô .

proof

literature

  • Edward F. Anderson : The Great Cactus Lexicon . Eugen Ulmer, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 179-182 .
  • Curt Backeberg : Die Cactaceae: Handbuch der Kakteenkunde . 2nd Edition. tape IV . Gustav Fischer Verlag, Stuttgart / New York 1984, ISBN 3-437-30383-X , p. 2619-2629 .
  • NL Britton , JN Rose : The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family . tape III . The Carnegie Institution of Washington, Washington 1922, p. 216-220 .

Individual evidence

  1. ↑ Dr. Pfeiffer: Discocactus insignis. In: General garden newspaper. Volume 5, Number 31, 1837, pp. 240-241. (online) .
  2. ^ Edward F. Anderson : The great cactus lexicon . Eugen Ulmer, Stuttgart 2005, ISBN 3-8001-4573-1 , p. 179-182 .
  3. ↑ P. Braun: Discocactus fariae-peresii (Cactaceae) - a new highland species from central Brazil. In: cact. and. Sukk. Volume 67, No. 2, 2016, pp. 33-39.
  4. ↑ P. Braun: Discocactus heptacanthus subsp. goiasensis (Cactaceae) - a new clan from Goias, central Brazil. In: cact. and. Sukk. Volume 70, No. 11, 2019, pp. 341-348.

further reading

  • MC Machado, DC Zappi, NP Taylor, EL Borba: Taxonomy and conservation of the Discocactus Pfeiff. (Cactaceae) species ocurring in the state of Bahia, Brazil. In: Bradleya . Volume 23, 2005, pp. 41-56.

Web links

Commons : Discocactus  - collection of images, videos and audio files