Platythelys

Platythelys
	Platythelys maculata , illustration
Systematics
Order :	Asparagales (Asparagales)
Family :	Orchids (orchidaceae)
Subfamily :	Orchidoideae
Tribe :	Cranichideae
Sub tribus :	Goodyerinae
Genre :	Platythelys
Scientific name
	Platythelys
	Garay

Platythelys is a genus from the family of the orchid (Orchidaceae). It consists of 13 types of herbaceous plants that are native to tropical and subtropical America. According to R. Govaerts, all species are included in the genus Aspidogyne .

description

The species of the genus Platythelys form a creeping rhizome , the hairy roots arise at the nodes . On the rising rungs, the leaves are spaced apart, the internodes are not compressed. The leaves are lanceolate to oval in shape, clearly stalked, the leaf base includes the shoot. The leaf blade is uniformly green or green with silver spots. In some mykoheterotrophic species, the leaves are reduced to small scales.

The terminal, racemose inflorescence has few or many flowers . The inflorescence axis can be hairy and is covered by some bracts . The bracts are about as long as ovary and the short flower stalk together. The flowers are resupinated , the petals are free. The three sepals are roughly the same shape and size, hairy on the outside. The lateral petals are inverted lanceolate, they lie close to the upper petal and form a tube or hood. The lip is divided into a bowl-shaped lower part (hypochil) and a three-lobed, spread out front part (epichil). The column is short, widened towards the front to form a wedge. The pollinia are each connected by a short stalk with a small adhesive disk (Viscidium). The scar consists of two surfaces that sit close together. The separating tissue between the stigma and the stamen (rostellum) is only flat. The capsule fruit is oval to almost cylindrical.

Occurrence

Platythelys is common in tropical and subtropical America. From the south of the USA via Mexico, Central America and the Caribbean, the distribution area stretches through the northern half of South America to Argentina and Paraguay. The distribution extends up to altitudes of 1200 meters. The locations are mostly in the shade of moist forests, rarely in moist grassland.

Systematics and botanical history

Flowers of Platythelys paranaensis

Platythelys is classified within the tribe Cranichideae in the subtribe Goodyerinae . According to Dressler, this can be further divided into two groups; Platythelys stands together with the majority of the genera that do not have two clearly separated scar surfaces.

The genus Platythelys was established in 1977 by Leslie Garay . As a type species he chose the up to then as erythrodes querceticola called querceticola platythelys . The name Platythelys is made up of the Greek words πλαθύς platys , "flat", and θῆλυς thelys , "female"; it refers to the flat rostellum.

The following species were counted among platythelys :

Platythelys alajuelae Ormerod : Costa Rica.
Platythelys debilis (Lindl.) Garay : Bolivia to Brazil and Argentina.
Platythelys maculata (Hook.) Garay : Is to be used as a synonym for Platythelys querceticola .
Platythelys mayoriana (Kraenzl.) Garay : Is to be used as a synonym for Platythelys querceticola .
Platythelys pachysepala Ormerod : Colombia.
Platythelys paranaensis (Kraenzl.) Garay : Brazil to Paraguay.
Platythelys peruviana Garay : Peru.
Platythelys platensis (Hauman) Garay : southern Brazil to northeastern Argentina.
Platythelys querceticola (Lindl.) Garay : Southeastern United States to Tropical America.
Platythelys sagrana (A.Rich.) Garay : Is to be used as a synonym for Platythelys querceticola .
Platythelys schlechteriana (Hoehne) Garay : Brazil.
Platythelys vaginata (Hook.) Garay : Is to be used as a synonym for Platythelys querceticola .
Platythelys venustula (Ames) Garay : Mexico to Ecuador.

literature

James D. Ackerman: Platythelys . In: Flora of North America Editorial Committee (Ed.): Flora of North America North of Mexico . tape 26 . Oxford University Press, New York and Oxford 2003, pp. 517 ( eFloras.org ).
Leslie A. Garay: 225 (1). Orchidaceae (Cypripedioideae, Orchidoideae and Neottioideae) . In: Gunnar Harling, Benkt Sparre (ed.): Flora of Ecuador . tape 9 , 1978, ISSN 0347-8742 , p. 285-287 .
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. 107-110 .

Individual evidence

↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p Rafaël Govaerts (Ed.): Platythelys. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved July 18, 2018.
↑ James D. Ackerman: Platythelys . In: Flora of North America . Vol. 26, p. 517.
↑ Leslie Garay: Platythelys . In: Flora of Ecuador . Vol. 9, pp. 285-287.
^ ^A ^b ^c Paul Ormerod, Phillip Cribb: Platythelys . In: Genera Orchidacearum . Vol. 3, pp. 138-140.
^ Robert L. Dressler: Phylogeny and Classification of the Orchid Family . University Press, Cambridge 1993, ISBN 0-521-45058-6 , pp. 118 .

Web links

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

[WCSP-1] ↑ ^a ^b ^c ^d ^e ^f ^g ^h ⁱ ^j ^k ^l ^m ⁿ ^o ^p Rafaël Govaerts (Ed.): Platythelys. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved July 18, 2018.

[Ackerman2003-2] James D. Ackerman: Platythelys . In: Flora of North America . Vol. 26, p. 517.

[Garay1978-3] Leslie Garay: Platythelys . In: Flora of Ecuador . Vol. 9, pp. 285-287.

[OrmerodCribb2003-4] A ^b ^c Paul Ormerod, Phillip Cribb: Platythelys . In: Genera Orchidacearum . Vol. 3, pp. 138-140.

[Dressler1993-5] Robert L. Dressler: Phylogeny and Classification of the Orchid Family . University Press, Cambridge 1993, ISBN 0-521-45058-6 , pp. 118 .