Dictyophyllaria dietschiana
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Flowers of Dictyophyllaria dietschiana |
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| ( Edwall ) Garay |
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Dictyophyllaria dietschiana is a plant from the family of orchids (Orchidaceae). It is the only species in the genus Dictyophyllaria . It is known only from a few specimens from southeast Brazil.
description
Dictyophyllaria dietschiana are herbaceous , terrestrial plants, they are about 40 centimeters high. The roots and the upright, often sympodially branched shoots arise from a branched rhizome . The stem axis is flexible and reaches four to five millimeters in diameter, the nodes are slightly thickened. The leaves are small (three inches long, 1.5 inches wide), stiff and slightly fleshy, triangular in shape and concave. They sit without a petiole on the shoot, which is half covered by the leaf base, they end pointed or slightly extended. The reticulate veins emerge on the underside of the leaf. Occasionally an aerial root arises opposite a leaf. These are slightly club-shaped, sometimes branched, up to ten centimeters long.
The one to three-flowered inflorescences are in the upper part of the shoots . The bracts are similar to the foliage leaves, but are slightly smaller. A flower stalk can hardly be seen. The ovary is narrow, 3.5 to four centimeters long, provided with two grooves lengthways, at the upper end with a wreath of sepal-like teeth (calyculus). The resupinated flowers are greenish white, they do not open wide, the petals are not fused together. The sepals are about 2.5 inches long and 0.7 inches wide, elongated to lanceolate in shape, somewhat constricted at the base, pointed to a point, keeled on the outside. The petals are just as long and similarly shaped as the sepals, slightly narrower, slightly crescent-shaped, the edges slightly wavy. Sepals and petals are somewhat concave. The white lip measures 2.5 inches long and two inches wide. It is not fused with the column , but at the base the sides of the lip are turned up and envelop the column in a tubular shape. The anterior part of the lip is spread out, turned down slightly, and the edge is curled. and forms a nectarium with it . The front part of the lip is rounded, spread out, with a wavy edge. The lip is covered with numerous longitudinal yellow strips. The column is slightly curved, 1.8 centimeters long, thin, slightly thickened towards the front, slightly triangular in cross section. The scar is slightly kidney-shaped and lies across the axis of the column. The stamen is bent down towards the columnar axis, two-chambered, the two pollinia are powdery-grainy texture. The capsule fruit is cylindrical, up to six inches long and upright. At maturity it is black, it does not open. The seeds are round, about 0.3 millimeters in size, shiny black and provided with a hard seed coat.
distribution
Dictyophyllaria dietschiana is only known from a few specimens. Their habitat, the rainforest in southeastern Brazil in the state of São Paulo , has been extensively cleared.
Systematics and botanical history
Dictyophyllaria dietschiana is classified within the subfamily Vanilloideae in the tribe Vanilleae . The relationship to other genera is unclear.
Dictyophyllaria dietschiana was first described in 1903 by Gustavo Edwall as Vanilla dietschiana . In 1986 Garay put it in its own genre. The name Dictyophyllaria comes from the Greek δίκτιον diktyon , "Network" and φύλλον phyllarion , "leaf" and refers to the reticulate veined leaves.
See also
supporting documents
Most of the information in this article comes from:
- Leslie A. Garay: Olim Vanillaceae . In: Botanical Museum Leaflets (Harvard University) . tape 30 , 1986, pp. 231-232 ( botanicus.org ).
- 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. 304-306 .
- Le Vanillier et la Vanille dans le Monde . In: Gilbert Bouriquet (ed.): Encyclopédie Biologique . tape XLVI . Paul Lechevalier, Paris 1954.
Individual evidence
- ↑ Rafaël Govaerts (Ed.): Dictyophyllaria. In: World Checklist of Selected Plant Families (WCSP) - The Board of Trustees of the Royal Botanic Gardens, Kew . Retrieved May 19, 2020.
- ^ In: Revista do Centra Sci. Letr. e Art. de Campinas . Vol. II (1903), p. 192 & plate 2
