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Caularthron bicornutum - infl 2.jpg
Caularthron bicornutum
Scientific classification e
Kingdom: Plantae
Clade: Angiosperms
Clade: Monocots
Order: Asparagales
Family: Orchidaceae
Subfamily: Epidendroideae
Tribe: Epidendreae
Subtribe: Laeliinae
Genus: Caularthron
Raf. (1837)

Diacrium Benth.

Caularthron Raf. (1837), abbreviated Cau.[2] in the horticultural trade, is a genus of orchids with 4 species.[3] They are epiphytic orchids with specialized hollow pseudobulbs that house ants; the genus is exclusively found in the tropical regions of southern Mexico, Central America, the West Indies, and northern South America.[1]

List of species[edit]

Species accepted as of May 2014:[1]


  1. ^ a b c Kew World Checklist of Selected Plant Families
  2. ^[permanent dead link] downloaded October 3, 2010
  3. ^ Information retrieved from on October 3, 2010, after entering "Caularthron".
  4. ^ page 251 of Leonardo P. Felix and Marcelo Guerra: "Variation in chromosome number and the basic number of subfamily Epidendroideae (Orchidaceae)" Botanical Journal of the Linnean Society 163(2010)234-278. The Linnean Society of London. downloaded October 2010 from