Prenia

Prenia
Prenia pallens
Systematics
Eudicotyledons Nuclear eudicotyledons Order : Clove-like (Caryophyllales) Family : Midday flowers (Aizoaceae) Subfamily : Mesembryanthemoideae Genre : Prenia
Scientific name
Prenia
NEBr.

Prenia is a genus of plants fromthe afternoon flower family (Aizoaceae).

description

The species of the genus Prenia are lying or upright small shrubs with fibrous roots . The internodes are weakly lignified. The cortex contains additional vascular bundles. It is whitish when it is dry. Their leaves are flat, flat triangular, obtuse triangular or almost cylindrical, circular, ovate to narrowly ovate or linear. They are arranged opposite to one another and briefly fused at their base or alternate on the inflorescence . Their central water-storing cells are only indistinctly different. The bladder cells of the internodes and leaves are mesomorphic and strongly flattened.

The flowers form cymes . They have a diameter of 20 to 40 millimeters. There are four to five sepals available. The white, yellow or pink petals are fused with the sepals to form a short tube. Thread-like staminodes are present. The nectaries are shell-shaped.

The four to five-compartment, strong capsule fruits have flap wings. The capsule fruits contain black, D-shaped or kidney-shaped seeds with a rough seed coat . They are up to 1.3 millimeters long.

Systematics and distribution

The genus Prenia is widespread in southern Namibia and the South African provinces of the Eastern Cape , Northern Cape and Western Cape in the Karoo in winter and summer rain areas .

It was first described in 1925 by Nicholas Edward Brown . The genus Prenia belongs to the subfamily Mesembryanthemoideae within the family of aizoaceae . The type species is Prenia pallens . The genus was revised in 1996 by Maike Gerbaulet .

The genus Prenia includes the following species and subspecies:

• Prenia englishiae (L.Bolus) Gerbaulet
• Prenia pallens (Aiton) NEBr.
  • Prenia pallens subsp. pallens
  • Prenia pallens subsp. lancea (Thunb.) Gerbaulet
  • Prenia pallens subsp. lutea (L.Bolus) Gerbaulet
  • Prenia pallens subsp. namaquensis Gerbaulet
• Prenia radicans (L.Bolus) Gerbaulet
• Prenia sladeniana (L.Bolus) L.Bolus
• Prenia tetragona (Thunb.) Gerbaulet
• Prenia vanrensburgii L. Bolus

proof

literature

• Gideon Smith et al. a. (Ed.): Mesembs of the World: Illustrated Guide to a Remarkable Succulent Group . Briza Publications, 1998, ISBN 1-875093-13-3 , pp. 46 .
• Heidrun EK Hartmann (Ed.): Illustrated Handbook of Succulent Plants: Aizoaceae FZ . Springer Verlag, Berlin / Heidelberg / New York 2001, ISBN 3-540-41723-0 , pp. 224 .

Individual evidence

1. ↑ Gardeners' Chronicle . 3rd episode, London 1925, Volume 78, p. 412.
2. ↑ Maike Gerbaulet: Revision of the genus Prenia NEBr. (Aizoaceae) . In: Botanical yearbooks for systematics . Volume 118, 1996, pp. 25-40.
3. ↑ Heidrun EK Hartmann (Ed.): Illustrated Handbook of Succulent Plants: Aizoaceae FZ . Springer Verlag, Berlin / Heidelberg / New York 2001, ISBN 3-540-41723-0 , pp. 225-227 .

Web links

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