Peridiscaceae
| Peridiscaceae | ||||||||||||
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| Peridiscaceae | ||||||||||||
| Kuhlm. |
The peridiscaceae are a small plant family within the order of the saxifrage-like (Saxifragales). The four genera with about ten species occur in tropical South America and Africa.
description
They are deciduous trees . The alternate, stalked leaves are large, simple and leathery, with a smooth leaf margin. The stipules are present.
They have racemose or clustered inflorescences . The small flowers are hermaphroditic and radial symmetry . There are four to seven sepal-like , free bracts , which are mostly hairy. The many (30 to 100) free, fertile stamens are formed centrifugally. Three or four carpels have become a top permanent ovary grown short with three or four, more or less free pencils and as many scars. There are drupes formed.
Systematics
The Peridiscaceae family was established in 1950 by João Geraldo Kuhlmann in Arquivos do Servico Florestal , 3, p. 4. Taxa of this family were previously in the families of the Flacourtiaceae, Passifloraceae , Medusandraceae Brenan nom. cons. or Soyauxiaceae FABarkley nom. nud. or the order Violales.
The Peridiscaceae family includes:
- Medusandra Brenan : The roughly two species are native to tropical West Africa.
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Peridiscus Benth. : It contains only one type:
- Peridiscus lucidus Benth. : It occurs in Brazil and Venezuela.
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Soyauxia Olive. : Up to seven species occur in tropical West Africa (selection):
- Soyauxia floribunda Hutch.
- Soyauxia gabonensis olive.
- Soyauxia grandiflora Gilg & Stapf
- Soyauxia talbotii Baker f.
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Whittonia Sandw. : It contains only one type:
- Whittonia guianensis Sandw. : It is native to northeastern South America.
According to Soltis et al. 2007 as shown in the evolution tree below. This also coincides with the work of Wurdack & Davis in 2009, except for the position of Whittonia , whose DNA sequences are so far unknown. Peridiscus and Whittonia are undoubtedly sister taxa due to their morphological characteristics .
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- The family of peridiscaceae in APWebsite. (Sections Description, Distribution and Systematics)
- The family of the Peridiscaceae at DELTA. (Section description)
- DE Soltis, JW Clayton, CC Davis, MA Gitzendanner, M. Cheek, V. Savolainen, AM Amorim, PSSoltis: Monophyly and relationships of the enigmatic family Peridiscaceae. , In: Taxon , Volume 56, Issue 1, 2007, pp. 65-73. Full text PDF.
- Kenneth J. Wurdack & Charles C. Davis: Malpighiales phylogenetics: Gaining ground on one of the most recalcitrant clades in the angiosperm tree of life , In: American Journal of Botany , Volume 96, Issue 8, 2009, pp. 1551-1570: Full text online.