Pogonia

Pogonia
	Pogonia ophioglossoides
Systematics
	Monocots
Order :	Asparagales (Asparagales)
Family :	Orchids (orchidaceae)
Subfamily :	Vanilloideae
Tribe :	Pogonieae
Genre :	Pogonia
Scientific name
	Pogonia
	Yuss.

Pogonia is a genus from the family of the orchid (Orchidaceae). It contains six species that are native to eastern North America and East Asia.

description

Pogonia are small, herbaceous , perennial plants. They have an underground, thin, hairy rhizome on which the thin roots sit. The shoot is erect and hollow. He carries a single sheet . This is oval to lanceolate, somewhat fleshy, veined in a reticulate manner.

The terminal inflorescence usually consists of only one, occasionally two or three flowers . The bract is large and leaf-like. The flowers are resupinated , the color is generally pink, with white and yellow parts. The petals are not fused together. The three sepals are oval and wide. The petals point forward and form a flower tube above the column . The lip is unlobed, the front edge is fringed, on the lip there are dense, yellow-colored appendages. The column is slender, at the base there are two indistinct glands, at the end it carries the stamen . The stamen, which is bent down in relation to the column axis, is surrounded by a hood-like tissue of the column (clinandrium), which ends with irregular teeth. The stamen contains the pollen in two chambers , which is loosely present as individual pollen grains (monads). The capsule fruit stands upright, it contains numerous, spindle-shaped seeds. These are a good one millimeter long and 0.15 millimeters wide. The seed coat is made up of a few, extremely elongated (up to 0.9 millimeters) cells.

The number of chromosomes is 2n = 18, for Pogonia japonica there are different counts from 2n = 18, 2n = 20 to 2n = 23, sometimes even 36, 62 or 68.

Pogonia japonica

Pogonia minor

Occurrence

Pogonia is common in eastern North America and East Asia. They usually grow in open, sunny locations, often in damp to wet, occasionally flooded areas.

Systematics and botanical history

Pogonia is classified within the subfamily Vanilloideae in the tribe Pogonieae . They are closely related to Isotria and the North American Cleistes (also known as Cleistesiopsis ).

Pogonia was first described by Antoine-Laurent de Jussieu in 1789 . The name Pogonia comes from the Greek πώγων pogon , "beard", and refers to the lip that is densely covered with appendages. Type species is Pogonia ophioglossoides .

The species of the genus Pogonia are:

Pogonia japonica Rchb.f. (Syn .: Pogonia kungii Tang & FTWang , Pogonia parvula Schltr. ): It occurs from the Far Eastern Asian Russia to China and Japan.
Pogonia minor (Makino) Makino : It occurs in Korea, Japan, Taiwan and the Chinese province of Guangdong .
Pogonia ophioglossoides (L.) Ker Gawl. : It occurs from Canada to the eastern and central United States.
Pogonia subalpina T.Yukawa & Y.Yamashita : The species first described in 2017 occurs on the Japanese island of Honshu.
Pogonia trinervia (Roxb.) Voigt : It occurs on the Moluccas .
Pogonia yunnanensis Finet : It occurs from southeastern Tibet to western Sichuan and northwestern Yunnan .

supporting documents

Most of the information in this article comes from:

Charles J. Sheviak, Paul M. Catling: Pogonia . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . tape 26 . Oxford University Press, New York and Oxford 2002, pp. 513 ( eFloras.org [accessed April 25, 2009]).
Alec M. Pridgeon, Phillip Cribb, Mark W. Chase, Finn Rasmussen (Eds.): Genera Orchidacearum. Orchidoideae (Part 2). Vanilloideae . tape 3/2 . Oxford University Press, New York and Oxford 2003, ISBN 0-19-850711-9 , pp. 294-297 .
Chen Xinqi, Stephan W. Gale, Phillip J. Cribb: Pogonia . In: Wu Zhengyi, Peter H. Raven, DY Hong (eds.): Flora of China . tape 25 : Orchidaceae (Draft). Missouri Botanical Garden Press, St. Louis 2009, ISBN 978-1-930723-90-0 , pp. 172 ( efloras.org [accessed April 25, 2009]).

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g Rafaël Govaerts (Ed.): Pogonia. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 1, 2020.

Web links

Commons : Pogonia - album with pictures, videos and audio files

Wikispecies: Pogonia - Species Directory

[WCSP-1] ↑ ^a ^b ^c ^d ^e ^f ^g Rafaël Govaerts (Ed.): Pogonia. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved April 1, 2020.