Saturday 25 May
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Cactus (Melocactus glaucescens)
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Find out here.Cactus fact file
- Description
- Biology
- Range
- Habitat
- Status
- Threats
- Conservation
- Find out more
- Glossary
- References
- Print factsheet
Cactus description
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Caryophyllales |
| Family | Cactaceae |
| Genus | Melocactus (1) |
This small, rounded or pyramidal cactus is highly attractive. The stem is crowned by a concentration of wool and bristles known as a 'terminal cephalium', which may reach up to 10 cm high (2), and is a feature unique to cacti from the genera Melocactus and Discocactus (4). The bristles themselves are hidden by thick, creamy-white wool through which delightful lilac-magenta flowers emerge (2). The stem of this species is a waxy, light blue colour when young, becoming greyish-green with age. The stem is composed of 7 - 15 ribs with widely spaced areoles from which brown-grey spines emerge (2). Deep magenta, or dark red coloured, rounded fruits develop from the fertilised flowers (2).
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Related species
Cactus biology
Very little is known about the biology of this cactus.
TopCactus range
Endemic to Bahia in eastern Brazil, this species is only known from four small sites to the north and west of Morro do Chapéu (2).
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Species with a similar range
Cactus habitat
Melocactus glaucescens inhabits the semi-arid forests and open areas of caatinga and campo rupestre vegetation zones. It is found in sandy soils or pure sand in the open, between low shrubs or amongst small stones (2).
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Species found in a similar habitat
Cactus status
Classified as Critically Endangered (CR - B1ab(iii)+2ab(iii)) on the IUCN Red List 2002 (1), and listed on Appendix I of CITES (3).
Cactus threats
This cactus is particularly attractive and has been highly prized by collectors over the years; it has suffered greatly from over-exploitation (1). Two of the sites where it occurs are close to a main road and are therefore easily accessible by collectors (3). Hybridisation (cross-breeding) with other Melocactus species also threatens the survival of this cactus in its pure form, and there is evidence of widespread hybridisation at two out of the four known sites for Melocactus glaucescens (2). An additional threat to the species is fire, which is commonly used by farmers in the area to induce re-growth of pasture for livestock grazing (2).
TopCactus conservation
Melocactus glaucescens has been placed on Appendix I of the Convention on International Trade in Endangered Species (CITES) since 1992, effectively banning International Trade in wild plants of this cactus (3). The species has recently been given further protection by the formation of the Parque Estadual do Morro do Chapéu; a new protected area which encompasses most of one of the known populations (2). It is also hoped that additional fieldwork will uncover further populations of this beautiful cactus; one of the known sites was discovered as recently as 2002 (2).
TopFind out more
For more information on Brazilian cacti see:
Taylor, N.P. & Zappi, D.C. (in press) Cacti of Eastern Brazil. Royal Botanic Gardens, Kew.
Authentication
Authenticated (20/3/03) by Dr Nigel Taylor, Royal Botanic Gardens, Kew.
http://www.rbgkew.org.uk
Glossary
- Areoles
- In cacti, the felted or woolly, cushion-like structures from which spines grow, flowers develop and new stems arise.
- Endemic
- A species or taxonomic group that is only found in one particular country or geographic area.
- Hybridisation
- Cross-breeding with a different species.
References
- IUCN Red List (February, 2003) www.redlist.org
- Taylor, N.P. & Zappi, D.C. (in press) Cacti of Eastern Brazil. Royal Botanic Gardens, Kew.
- CITES (February, 2003) www.cites.org
- Hewitt, T. (1993) The Complete Book of Cacti and Succulents. Dorling Kindersley, London.
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Image credit
Melocactus glaucescens with flowers blooming from cephalium
© Nigel P. Taylor / 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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