Acrorchis roseola
| Acrorchis roseola | ||||||||||||
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| Systematics | ||||||||||||
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| Scientific name of the genus | ||||||||||||
| Acrorchis | ||||||||||||
| Dressier | ||||||||||||
| Scientific name of the species | ||||||||||||
| Acrorchis roseola | ||||||||||||
| Dressier |
The orchid Acrorchis roseola is the only species in the genus Acrorchis . It was not until 1990 Robert Louis Dressler described . The small plants grow epiphytically or lithophytically in Costa Rica and Panama.
description
The sprouts of Acrorchis roseola stand at intervals on a creeping rhizome and form a loosely clumpy plant. The shoots are not thickened, they consist of several internodes and are nine to 13 centimeters long. The six to ten leaves are in two lines on the stem. They are elongated-oval, gray-green underneath with a dark central rib, and dark green above.
The inflorescence appears at the top of the shoot. The flowers appear between several small bracts one after the other , they are located on a strongly compressed inflorescence axis. The resupinated flowers are white to pink in color. The sepals and petals are almost the same: narrow, about eight to ten millimeters long and three millimeters wide. The three outer petals are fused together a short distance at the base. The lip is only indistinctly three-lobed, the side lobes are turned up a little. At the base of the lip this forms a small bulge; from there to the middle of the lip a yellow callus extends. The approximately three millimeter long column is half fused with the lip. The rostellum separates stigma and stamen , but does not produce an adhesive disc. The stamen contains four pollinia .
The fruit is an oval, six-ribbed capsule , about ten by six millimeters in size.
distribution
Acrorchis roseola grows in Costa Rica and Panama at altitudes of 900 to 1800 meters. It occurs as an epiphyte in damp forests. In the higher altitudes and in exposed places where hardly any trees grow, it can be found lithophytically on rocks overgrown with moss or on the ground.
Systematics
Within the subfamily Epidendroideae , the genus Acrorchis is classified in the tribe Epidendreae and there in the subtribe Laeliinae . Acrorchis is closely related to Jacquiniella .
The name Acrorchis is made up of the ancient Greek άκρος "acros" (mountain peak) and όρχις "orchis" (here: orchid) and refers to the high-altitude sites. The specific epithet roseola refers to the pink flowers.
literature
- Robert L. Dressler: Acrorchis, a new genus from the mountains of Panama and Costa Rica . In: Orquídea (Mexico City) 12 (1): 11-17. 1990 Online, accessed January 1, 2014
- Alec M. Pridgeon, Phillip Cribb, Mark W. Chase: Genera Orchidacearum . Vol. 4/1: Epidendroidae (Part one) . P. 187f. Oxford University Press, 1999. ISBN 0-19-850712-7
Individual evidence
- ^ Cássio van den Berg et al. (2000): A phylogenetic analysis of Laeliinae (Orchidaceae) based on sequence data from internal transcribed spacers (ITS) of nuclear ribosomal DNA. Lindleyana 15 (2): 96-114. Online, accessed on December 14, 2007 ( Memento of the original from September 26, 2007 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice.
