Cybebus grandis
| Cybebus grandis | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Cybebus | ||||||||||||
| Garay | ||||||||||||
| Scientific name of the species | ||||||||||||
| Cybebus grandis | ||||||||||||
| Garay |
The orchid Cybebus grandis is the only species in the genus Cybebus . The perennial plants grow terrestrially in the Andes, the distribution area is a small area in Ecuador and Colombia.
description
Cybebus grandis forms a basal rosette of five to six spirally arranged leaves on a strongly compressed shoot . The hairy roots are thick and fleshy, cylindrical or cigar-shaped. The fleshy leaf blade is oval in shape, the tip of the leaf is blunt. The leaf base merges into a wedge-shaped leaf stalk that is rutted on top. The petiole includes the stem axis at the base. The petiole and blade each measure about ten centimeters. The whole plant is about 50 centimeters high with the inflorescence .
The racemose inflorescence appears terminal. In the lower, smooth area it has some leaf-like, lanceolate bracts. In the upper area, the stem is slightly hairy, there are the few, white, resupinated flowers . The bracts are lanceolate and longer than the ovary . The ovary stands upright, the lower part of the flower is bent by about 90 ° and points horizontally or slightly downwards. The petals are oval-lanceolate, somewhat papillae on the outside, about 3.5 centimeters long and 0.5 centimeters wide. The sepals are fused together at the base, the free part of the two lateral sepals is spread apart, while the upper sepal forms a tube with the petals and the lip inclined together. At the base, the lip is strongly narrowed, with two lateral, rearward-facing appendages that secrete nectar. The center of the lip is slightly yellow in color. The front part is bent down and a little crinkled at the edge. The slender column is studded with backward-facing hair. At the base it is fused with the sepals and the upper petal. The stamen contains two soft pollinia , which are connected on the underside (ventral) with an adhesive tissue ( Viscidium ). The scar consists of an area that is hidden under the separating tissue between the scar and the stamen ( rostellum ). The rostellum is split into two oval lobes at the top; after removing the pollinia a small point remains between these lobes.
The shape of the flower with the difficult-to-reach nectarium suggests bees with long tongues as pollinators.
distribution
Cybebus grandis is native to the border region between Ecuador and Colombia. It occurs at altitudes from 1500 to 1900 (2300) meters. It grows in very damp, swampy terrain.
Systematics and botanical history
The first description of Cybebus grandis comes from Leslie Andrew Garay in 1978. The generic name Cybebus comes from the Greek "kybebos" and means "bent"; it refers to the flowers curved at the base. The species is classified in the subgenus Orchidoideae and there in the tribe Cranichideae . Closely related species are assumed to be in the genus Stenorrhynchos or Brachystele . Other related species are summarized in the Subtribus Spiranthinae .
supporting documents
- CH Dodson, CA Luer (2005): Orchidaceae part 2 (Aa-Cyrtidiorchis) . In: G. Harling, L. Andersson (Eds.): Flora of Ecuador . Vol. 76, pp. 300-302. Botanical Institute, Göteborg University, ISBN 91-88896-51-X
- Alec M. Pridgeon, Phillip J. Cribb, Mark W. Chase, Finn N. Rasmussen (Eds.): Genera Orchidacearum . Vol. 3: Orchidoideae (Part two). Vanilloideae . Pp. 185-188. Oxford University Press, 2003. ISBN 0198507119