Discocactus

Not to be confused with Disocactus.

Discocactus
Discocactus bahiensis (lower left)
CITES Appendix I [2]
Scientific classification Edit this classification
Kingdom: Plantae
Clade: Embryophytes
Clade: Tracheophytes
Clade: Spermatophytes
Clade: Angiosperms
Clade: Eudicots
Order: Caryophyllales
Family: Cactaceae
Subfamily: Cactoideae
Tribe: Cereeae
Subtribe: Cereinae
Genus: Discocactus
Pfeiff.[1]
Type species
Discocactus placentiformis
Species

See text.

Synonyms[1]
  • Neodiscocactus Y.Itô, without full replaced synonym ref.

Discocactus is a genus of tropical cacti. Discocactus plants are endemic to southern Brazil, eastern Bolivia, and northern Paraguay.[3] These species are in the risk of extinction in the wild.

Description

The species of the genus Discocactus are depressed spherical to spherical and usually solitary plants, with mostly numerous, at the base somewhat broadened ribs and well-developed warts. The areoles are usually covered by strong thorns. At the apex of the adult plants, there is a wooly cephalium, white or shaded with yellow or grey. The terminal cephalium, up to 4 centimeters high, is slightly depressed. It consists of white, yellowish to grayish white wool and may have bristly spines.

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

The spherical to club-shaped to oblong, white to pink to bright red fruits are glabrous and slightly fleshy. They open at a vertical slit and have a perennial flower remnant. The fruits contain broadly oval to almost spherical, shiny black seeds that are 2 to 2.5 millimeters long.[4]

Taxonomy

The genus was first described in 1837 by Ludwig Georg Karl Pfeiffer.[5] The name comes from the ancient Greek diskos (=disc) because of its shape.

Species

All species are listed under Appendix I of CITES meaning commercial international trade is prohibited and non-commercial international trade is regulated.[2]

As of September 2023, Plants of the World Online accepted the following species:[1]

Image Scientific name Distribution
Discocactus bahiensis Britton & Rose Brazil (Bahia, Ceará, Pernambuco, and Piauí)
Discocactus boliviensis Buining & Brederoo Bolivia (Santa Cruz)
Discocactus buenekeri W.R.Abraham Brazil (Bahia)
Discocactus catingicola Buining & Brederoo Brazil (Mato Grosso)
Discocactus diersianus Esteves Brazil (Goiás)
Discocactus fariae-peresii P.J.Braun Brazil (Goiás)
Discocactus ferricola Buining & Brederoo Bolivia to Brazil (Mato Grosso do Sul)
Discocactus hartmannii (K.Schum.) Britton & Rose Paraguay to Brazil (Goiás, Mato Grosso do Sul)
Discocactus heptacanthus (Barb.Rodr.) Britton & Rose Bolivia (Chuquisaca, Santa Cruz, Tarija), Brazil (Bahia, Goias, Mato Grosso, Mato Grosso do Sul, Minas Gerais), Paraguay (Alto Paraguay, Alto Parana, Amambay, Boqueron, Caaguazu, Caazapa, Canindeyu, Central Departemento, Concepcion, Cordillera, Guaira, Itapua, Misiones (Departamento), Neembucu, Paraguari, Presidente Hayes, San Pedro)
Discocactus horstii Buining & Brederoo Brazil (Minas Gerais: Mun. Grão-Mogol)
Discocactus petr-halfarii Zachar Brazil (Bahia)
Discocactus placentiformis (Lehm.) K.Schum. Brazil (Minas Gerais)
Discocactus pseudoinsignis N.P.Taylor & Zappi Brazil (Minas Gerais)
Discocactus zehntneri Britton & Rose Brazil (Bahia)

References

  1. ^ a b c "Discocactus Pfeiff." Plants of the World Online. Royal Botanic Gardens, Kew. Retrieved 2023-09-30.
  2. ^ a b "Appendices | CITES". cites.org. Retrieved 2022-01-14.
  3. ^ Machado, Marlon C.; Zappi, Daniela C.; Taylor, Nigel P.; Borba, Eduardo L. (2005). "Taxonomy and conservation of the Discocactus Pfeiff. (Cactaceae) species occurring in the state of Bahia, Brazil". Bradleya. 23 (23). British Cactus and Succulent Society: 41–56. doi:10.25223/brad.n23.2005.a7. ISSN 0265-086X.
  4. ^ Anderson, Edward F.; Eggli, Urs (2005). Das grosse Kakteen-Lexikon (in German). Ulmer. pp. 179–182. ISBN 3-8001-4573-1.
  5. ^ Dietrich, Albert; Otto, Friedrich (1837). "Allgemeine Gartenzeitung". Biodiversity Heritage Library. Retrieved 2023-08-14.

Bibliography

  • Edward F. Anderson : The Cactus Family. Timber Press: Portland (Oregon), 2001, p. 218-221 ISBN 0-88192-498-9
  • N. L. Britton, J. N. Rose: The Cactaceae. Descriptions and Illustrations of Plants of the Cactus Family. Washington, 1920
  • Wikimedia Commons logo Media related to Discocactus at Wikimedia Commons
  • Wikispecies logo Data related to Discocactus at Wikispecies
  • (in French) photos on www.AIAPS.org
  • (in English) photos on www.cactiguide.com

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