Plectranthus (Plectranthus cataractarum)

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Plectranthus, leaves and flowers
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Plectranthus fact file

Plectranthus description

KingdomPlantae
PhylumTracheophyta
ClassMagnoliopsida
OrderLamiales
FamilyLabiatae
GenusPlectranthus (1)

This small herb is unusual amongst the mint family (Labiatae) as it is one of a very few species that occupies habitats in and around water (2). This specialisation is reflected in the specific name of cataractarum, which means 'of waterfalls' (2). The stems are often seen growing along, or climbing up, rocks and stones; the single inflorescence (or flower stalk) is unbranched and has a fine covering of white hairs (2). The small leaves are fleshy with bluntly-toothed outer edges (2). At the end of the inflorescence, there are between 6 - 8 whorls of flowers, each consisting of up to 14 small mauve or white flowers (2). Plants are often seen together, forming large clumps growing upon rocks at the edge of waterfalls; these clumps may be up to 3m² in area (2).

Size
Height: 20 - 40 cm (2)
Leaf length: up to 7 cm (2)
Leaf width: up to 2.5 cm (2)
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Plectranthus biology

Flowering and fruiting begin towards the end of the rainy season, in October and November, and extend into February (2). These plants are usually seen growing upon rocks and stones in large groups (2).

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Plectranthus range

Found in West Africa: on Mount Cameroon and the Bakossi Mountains in Cameroon, and also known from Equatorial Guinea (2).

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Plectranthus habitat

Plectranthus cataractarum inhabits the spray zone of waterfalls, on wet rocks in lowland or submontane evergreen forests (2). Plants have been recorded from sites that are between 300 and 1,450 metres above sea level (2).

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Plectranthus status

Classified as Vulnerable (VU - A2c, B2ab(ii, iv, v); C2a(i); D2), under IUCN Red List categories (3).

IUCN Red List species status – Vulnerable

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Plectranthus threats

In Cameroon, this species is threatened by the clearance of its natural forest habitat to make way for oil palm plantations; Plectranthus cataractarum may already be extinct from one site on Mount Cameroon where the forest has been lost (2). This species is also threatened by the small area of its occurrence, possibly not more than 5 - 10km², which makes its future inherently vulnerable (2).

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Plectranthus conservation

This unusual species was only discovered as recently as 1998 and despite threats from deforestation, it has a fairly wide distribution. Additional security is gained by the fact that some sites are too high to be threatened by plantation development (2). The Ministry of Environment and Forests has proposed a forest reserve in Cameroon, which would encompass one of the sites of Plectranthus cataractarum in the Bakossi Mountains (2).

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Authentication

This information is awaiting authentication by a species expert, and will be updated as soon as possible. If you are able to help please contact: arkive@wildscreen.org.uk
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Glossary

Herb
A small, non-woody, seed bearing plant in which all the aerial parts die back at the end of each growing season.
Inflorescence
The reproductive shoot of the plant, which bears flowers (See http://www.rbgkew.org.uk/ksheets/pdfs/flower.pdf for a fact sheet on flower structure).
Whorls
In animals, the spiral or convolutions in the shell of a snail. In plants, a set of leaves, flowers, or branches that spring from a stem at the same point and encircle it.
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References

  1. IUCN Red List (February, 2003) www.redlist.org
  2. Pollard, B.J. & Paton, A. (2001) A new rheophytic species of Plectranthus L'Hér. (Labiatae) from the Gulf of Guinea. Kew Bulletin, 56: 975 - 982.
  3. Paton, A. (Oct, 2002) Pers. comm.
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Image credit

Plectranthus, leaves and flowers  
Plectranthus, leaves and flowers

© Ben Pollard / Royal Botanic Gardens, Kew

Royal Botanic Gardens, Kew
Richmond
Surrey
TW9 3AB
United Kingdom
Tel: +44 (0) 208 332 5000
Fax: +44 (0) 208 332 5197
info@kew.org
http://www.rbgkew.org.uk

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