Ponthieva

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Ponthieva
Ponthieva racemosa, illustration

Ponthieva racemosa , illustration

Systematics
Order : Asparagales (Asparagales)
Family : Orchids (orchidaceae)
Subfamily : Orchidoideae
Tribe : Cranichideae
Sub tribus : Cranichidinae
Genre : Ponthieva
Scientific name
Ponthieva
R.Br.

Ponthieva is a genus from the family of the orchid (Orchidaceae). It consists of more than seventy types of herbaceous plants native to tropical and subtropical America.

description

The species of the genus Ponthieva are terrestrial herbaceous plants. The roots , which arise in clusters, are fleshy and hairy. The leaves are in a basal rosette, they are clearly or barely stalked. Their shape is lanceolate to oval.

The loosely racemose inflorescence is terminal. It is usually long, upright, hairy, it has few to numerous flowers . The peduncle is hairy and has some bracts . The bracts are shorter than the flowers. The ovary is stalked and hairy glandular. The flowers are rather small, not resupined , the petals are thin in texture. The three sepals are mostly free, the sides can be fused together at their base for a piece. The petals are asymmetrically shaped, narrow at the base (nailed) and fused with the column , the front part is often conspicuous and replaces the lip in its visual effect . In contrast to the other petals, the lip is fleshy, concave in shape, fused with the column at the base, with entire margins or three lobes. The column is short, cylindrical, and fleshy. The scar is oval transverse to the column axis, bulging at the lateral edges. The stamen is bent down opposite the columnar axis, it contains four yellow, floury pollinia , which sit on stalks on a small glutinous gland (Viscidium). The rostellum between the stigma and the stamen is stretched forward in the shape of a finger and is flexible. Oval capsules are formed.

Bees from the Halictidae family were observed as flower visitors . The lip produces an oily substance, which suggests pollinators from the bee family Anthophoridae .

Occurrence

Ponthieva occurs from the subtropical south of the USA through Central America and the Caribbean to the northern half of South America. The southernmost occurrences are found in Argentina and Paraguay. Altitudes up to 3000 meters are settled. The locations are mostly in damp places in the shade of forests.

Systematics and botanical history

Ponthieva brenesii
Ponthieva collantesii
Ponthieva maculata
Ponthieva maculata
Ponthieva petiolata , illustration
Ponthieva racemosa
Ponthieva tunguraguae

The genus Ponthieva was set up in 1813 by Robert Brown in Aiton's "Hortus Kewensis". The name honors Henri de Ponthiev. Type species is Ponthieva glandulosa , a synonym for Ponthieva racemosa .

Ponthieva is classified within the tribe Cranichideae in the subtribe Cranichidinae . The genus Baskervilla and Cranichis are closely related .

The following types are known:

See also

literature

  • James D. Ackerman: Ponthieva . In: Flora of North America . tape 26 , p. 547 ff . ( 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. 211 .
  • 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 .

Individual evidence

  1. ↑ James D. Ackerman: Ponthieva . In: Flora of North America . Vol. 26, p. 547.
  2. ^ A b c Phillip Cribb, Alec Pridgeon: Ponthieva . In: Genera Orchidacearum . Vol. 3, pp. 43-46.
  3. ↑ Leslie Garay: Ponthieva . In: Flora of Ecuador . Vol. 9, p. 211.
  4. ^ Robert L. Dressler: Phylogeny and Classification of the Orchid Family . Cambridge University Press, 1993, ISBN 0-521-45058-6 , pp. 122 .
  5. ↑ a b c Rafaël Govaerts (ed.): Ponthieva. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved July 18, 2018.
  6. ↑ Gerardo A. Salazar, Lidia I. Cabrera, Santiago Madriñán, Mark W. Chase: Phylogenetic relationships of Cranichidinae and Prescottiinae (Orchidaceae, Cranichideae) inferred from plastid and nuclear DNA sequences . In: Annals of Botany . tape 104 , 2009, p. 403-416 , doi : 10.1093 / aob / mcn257 .

Web links

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