According to Neotropikey[NTK]
Every, J.L.R. (2010). Neotropical Peridiscaceae.
Trees, deciduous . Leaves alternate , simple , lamina leathery, margins entire , tri-nerved, large pit on the underside in each axil of basal lateral veins ; pulvinate at both ends of petiole ; stipules present, intrapetiolar , caducous (leaving prominent scars). Inflorescence axillary racemes (Peridiscus Benth.) or fascicles (Whittonia Sandwith), bracteoles large and persistent . Flowers regularly symmetrical, bisexual ; sepals 4-5(-6) (Peridiscus) or 7 (Whittonia), imbricate , reflexed when open; apetalous ; stamens numerous; ovary superior , syncarpous, half immersed in disc and glabrous (Peridiscus) or woolly and on top of disc (Whittonia); carpels 3-4; styles 3(-4), free , ovules 6-8, pendulous. Fruit drupaceous (unknown in Whittonia). Seed 1 per fruit .
- General Description
Notes on delimitation
- This little known family is currently assigned to the Saxifragales (APGIII).
- Two of the family's three genera have been collected in the Neotropics, both of which are monotypic: Peridiscus lucidus Benth and Whittonia guianensis Sandwith.
Distribution in the Neotropics
- Collected in both Brazil and the Guianas.
Other important characters
- Fruit only known from Peridiscus.
- No petals.
- Stipules leave prominent scars.
- Leaves alternate.
- Leaf with three main veins.
- Pulvinus at both top and bottom of petiole.
- Large, persistent bracteoles.
- Sepals imbricate.
- Disk present.
APG III. 2009. An update of the Angiosperm Phylogeny Group classification for the orders and families of flowering plants. Botanical Journal of the Linnean Society 161(3): 105-121.
Heywood, V.H.H. 2007. Peridiscaceae. In: V.H. Heywood, R.K. Brummitt, A. Culham and O. Seberg (eds.). Flowering plant families of the world. P. 249. Royal Botanic Gardens, Kew.
Mabberley, D.J. 2008. Mabberley's plant book. Third edition. Cambridge University Press, Cambridge.
Stevens, P.F. 2008. Angiosperm Phylogeny Website. Version 9 onwards. http://www.mobot.org/MOBOT/research/APweb/
According to Flora of West Tropical Africa under the synonym Medusandraceae[FWTA]
Medusandraceae, Hutchinson and Dalziel. Flora of West Tropical Africa 1:2. 1958
- Trees or shrubs
- Leaves alternate, simple, entire or crenate; stipules present, sometimes small and early caducous
- Flowers hermaphrodite, racemose or spicate, actinomorphic, hypogynous or perigynous
- Sepals 5, open or imbricate in bud, free, or united only at the base
- Petals 5, free, imbricate in bud
- Stamens numerous, or 5 fertile opposite the petals alternating with 5 staminodes, free from each other; anthers 4-celled, opening laterally
- Disk present or absent
- Ovary superior, syncarpous, 1-celled, with a central column; ovules 6–8, pendulous from the apex of the column, anatropous; styles 3 (–4), free
- Fruit with persistent calyx, capsular, dehiscing into 3 (–4) valves, or by the cohesion of 2 valves appearing 2-valved
- Seed solitary in each fruit, with copious endosperm and small straight embryo
First published in Arq. Serv. Florest. 3: 4. 1950 (1950)
- APG IV (2016) http://dx.doi.org/10.1111/boj.12385
Flora of West Tropical Africa
Flora of West Tropical Africa
Kew Names and Taxonomic Backbone
The International Plant Names Index and World Checklist of Selected Plant Families 2019. Published on the Internet at http://www.ipni.org and http://apps.kew.org/wcsp/
© Copyright 2017 International Plant Names Index and World Checklist of Selected Plant Families. http://creativecommons.org/licenses/by/3.0
Milliken, W., Klitgard, B. and Baracat, A. (2009 onwards), Neotropikey - Interactive key and information resources for flowering plants of the Neotropics.