Presliophytum
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Presliophytum sp. |
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| ( Urb. & Gilg ) Weigend |
Presliophytum is a genus of plants withinthe nettle family (Loasaceae). The only three species occur only in western Peru.
description
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Vegetative characteristics
In Presliophtyum incanum and Presliophytum arequipense is upright, highly branched shrubs , but at Presliophytum heucheraefolium to an annual herbaceous plant . A strong, fleshy taproot is formed. The above-ground parts of the plant are always covered with nettle hair.
The lower leaves are opposite, the upper alternate. The simple leaf blades are egg-shaped to kidney-shaped, slightly lobed and furrowed on the edge.
Generative characteristics
The inflorescences are composed of asymmetrical and complex dichasias . The upright flowers seem to be irregularly opposite to the foliage leaves, which, however, represent frondose bracts .
The hermaphroditic flowers are radial symmetry and five-fold with a double flower envelope . There are five sepals . The five boat-shaped petals are white to cream-colored. There are five staminode groups . The three outer ones are fused and form a white scale leaf ( nectar scale ), on the outer side of which there are three long, pure white appendages. The two inner staminodes are white and S-shaped. The stamens are in five bundles of 10 to 15 each. The ovules are deeply divided into three lamellae. The ovary is subordinate.
The capsule fruit is almost spherical.
There is diploidy with a chromosome number of 2n = 24.
distribution
All three species are endemic to the desert in western Peru, below altitudes of 2000 meters. They grow there on rocky slopes.
Systematics
The name Presliophytum was first described in 1900 by Ignatz Urban and Ernst Friedrich Gilg as a section of the genus Loasa in Nova Acta Academiae Caesareae Leopoldino-Carolinae Germanicae Naturae Curiosorum , Volume 76, 1, page 260. In 1997, after extensive systematic work on the Loasaceae family in Maximilian Weigend's doctoral thesis, it was determined that the rank of a genus is required. This rank of a genus became valid in 2006 in Taxon , Volume 55, Issue 2, page 467.
The genus Presliophytum belongs to the tribe Loaseae in the subfamily Loasoideae within the family Loasaceae . The closest related genus is Huidobria .
Only three species belong to the genus Presliophytum :
- Presliophytum arequipense Weigend
- Presliophytum heucherifolium (Killip) Weigend
- Presliophtyum incanum (Graham) Weigend
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literature
- Maximilian Weigend: Loasaceae. In: Klaus Kubitzki (Ed.): The Families and Genera of Vascular Plants . Volume 6: Flowering Plants, Dicotyledons: Celastrales, Oxalidales, Rosales, Cornales, Ericales . Springer, Berlin / Heidelberg / New York 2004, ISBN 3-540-06512-1 , pp. 248 (English, limited preview in Google Book search).
- Maximilian Weigend: Familial and generic classification , online , accessed on July 19, 2008
- Maximilian Weigend: Nasa and the conquest of South America: systematic rearrangements in Loasaceae Juss. , 1997, p. 215.
Individual evidence
Most of the information in this article has been taken from the sources given under references; the following sources are also cited:
- ↑ a b Presliophytum at Tropicos.org. Missouri Botanical Garden, St. Louis. Retrieved September 24, 2017.
- ↑ International Code Of Botanical Nomenclature ( Vienna Code ), Art. 30.5, Ex. 10, online.
- ^ Presliophytum in the Germplasm Resources Information Network (GRIN), USDA , ARS , National Genetic Resources Program. National Germplasm Resources Laboratory, Beltsville, Maryland. Retrieved September 24, 2017.
