Galeoglossum thysanochilum
| Galeoglossum thysanochilum | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Systematics | ||||||||||||
|
||||||||||||
| Scientific name | ||||||||||||
| Galeoglossum thysanochilum | ||||||||||||
| ( BLRob. & Greenm. ) Salazar |
Galeoglossum thysanochilum ( Syn. Pseudocranichis thysanochila (BLRob. & Greenm.) Garay ) is a kind from the family of orchids (Orchidaceae). The small herbaceous plants are native to southern Mexico.
description
Galeoglossum thysanochilum has spindle-shaped, fleshy roots . Two to four leaves form a basal rosette. The leaves are sessile and taper at the base in a wedge shape. The leaf blade is oval, the color is a bluish green. The leaves are still present during the flowering period in October and November; they wither when the dry season sets in from December.
The terminal, racemose inflorescence is upright to slightly arched and quite slender. At intervals the peduncle is covered with a few bracts , it is hairless over its entire length. The inflorescence is multi-flowered, the flowers are not resupinated, they give off a pleasant scent during the day. The ovary is cylindrical, sessile, hairless and not twisted. The petals are white, the lip has some green veins and a yellow spot. The sepals are shaped in the same way and not grown together, their texture is slightly fleshy. The petals are also free, their tips are slightly irregular in shape. The lip is fleshy, arrow-shaped at its base with two nectar glands pointing backwards. The sides of the lip are turned up and form a tube with the column and other petals, while the tips of the petals are spread out or turned back. The edge of the lip is provided with three thickened ridges and along the middle with backward directed hair. The outside of the lip is covered with rounded papillae along the middle . The lip ends at the front with a two-lobed, fringed appendage. The column is fleshy and short, hairy on the underside and provided with a longitudinally protruding bar. At the base the column protrudes asymmetrically beyond the point of attachment at the ovary (column foot), towards the top it becomes wider, the top is cut off bluntly. The scar is saddle-shaped, laterally with two scar surfaces that are separated in the middle by a dry, sterile surface. The stamen is elongated oval, slightly heart-shaped at the base and with a clearly separated stamen, ending bluntly at the front. The pollinia are narrow club-shaped with a small glutinous gland ( Viscidium ). The separating tissue between the stigma and stamen is not as wide as the stigma; it ends bluntly cut off with a pit in which the viscidium sits.
Occurrence
Galeoglossum thysanochilum occurs in southern Mexico in the state of Oaxaca . The climate has a cool dry period from December to April. The predominant vegetation is forests of oak and various coniferous trees. The plants grow on limestone subsoil at altitudes of (1400) 1500 to 2400 meters.
Systematics and botanical history
Galeoglossum thysanochilum was described by Robinson and Greenman in 1896 as Cranichis thysanochila . Garay established a genus of its own, Pseudocranichis , for this species . He placed them in the subtribe Spiranthinae , assuming that the sides of the lip were attached to the column. Salazar came to the conclusion after field studies that this was probably a consequence of the pressed herbarium material , he describes the lip as free from the column. He thus confirms earlier assumptions that classified this species in the subtribe Cranichidinae .
According to DNA studies, a close relationship between the species then known as Pseudocranichis thysanochila and a species of the genus Prescottia ( Prescottia tubulosa (Lindl.) LOWilliams ) was established. Salazar reactivated the genus Galeoglossum A.Rich for these two species . & Galeotti , which was set up in 1845.
The genus Galeoglossum A.Rich. & Galeotti includes the following types:
- Galeoglossum cactorum Salazar & C. Chávez : It wasfirst describedin 2011 from the Mexican state of Oaxaca .
- Galeoglossum thysanochilum (BLRob. & Greenm.) Salazar (Syn .: Cranichis thysanochila BLRob. & Greenm. , Pseudocranichis thysanochila (BLRob. & Greenm.) Garay ): It occurs in Oaxaca .
- Galeoglossum tubulosum (Lindl.) Salazar & Soto Arenas (Syn .: Cranichis tubulosa Lindl. ): It occurs in Mexico and Guatemala.
literature
- Leslie A. Garay: A generic revision of the Spiranthinae . In: Botanical Museum Leaflets of Harvard University . tape 28 , no. 4 , 1982, pp. 347-348 .
- Alec M. Pridgeon, Phillip Cribb, Mark W. Chase, Finn Rasmussen (Eds.): Genera Orchidacearum. Orchidoideae (Part 2). Vanilloideae . tape 3 . Oxford University Press, New York / Oxford 2003, ISBN 0-19-850711-9 , pp. 53-54 .
- Gerardo A. Salazar: DNA, Morphology, and Systematics of Galeoglossum (Orchidaceae, Cranichidinae) . In: Alec Pridgeon, JP Suarez (Ed.): Proceedings of the Second Scientific Conference on Andean Orchids . 2008, p. 161-172 .
Individual evidence
- ↑ a b c d Rafaël Govaerts (Ed.): Galeoglossum. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved July 19, 2018.