Thursday 23 May
Dwarf jellico (Sium burchellii)
Dwarf jellico fact file
- Description
- Biology
- Range
- Habitat
- Status
- Threats
- Conservation
- Find out more
- Glossary
- References
- Print factsheet
Dwarf jellico description
| Kingdom | Plantae |
| Phylum | Tracheophyta |
| Class | Magnoliopsida |
| Order | Apiales |
| Family | Umbelliferae |
| Genus | Sium (1) |
Dwarf jellico is a rare low-growing herbaceous plant confined to St Helena Island in the South Atlantic (1) (2). It has fleshy, hollow green stems and compound leaves made up of acutely toothed leaflets. The inflorescence comprises a flat-topped umbel of white flowers that develop into small green fruit (2).
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Related species
Dwarf jellico biology
Little is known about the natural history of dwarf jellico except that it normally flowers during the southern hemisphere summer, from December to January (1)
TopDwarf jellico range
Restricted to small and fragmented subpopulations on St Helena (1).
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Species with a similar range
Dwarf jellico habitat
Grows on steep cliffs and rocky ledges amongst cabbage trees and tree ferns (1).
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Species found in a similar habitat
Dwarf jellico status
Classified as Endangered (EN) on the IUCN Red List (1).
Dwarf jellico threats
The threat of alien plants outcompeting remaining subpopulations of dwarf jellico on St Helena is one of the primary concerns for this species. All the sub-populations grow on rocky outcrops where they face the additional threat of landslides. Concerns have also been raised that dwarf jellico is under threat from hybridisation with another St Helena endemic, large jellico (Sium bracteatum) (1).
TopDwarf jellico conservation
Some dwarf jellico subpopulations are protected within the Diana’s Peak National Park, which is protected by a management plan (1). In the past, efforts have been made to ensure survival of this species by collecting seeds and planting seedlings in suitable habitat (1) (2). Currently, the St Helena National Trust is involved in efforts to control invasive plants and to conduct further research into additional conservation measures for the endemic fauna and flora (3).
TopFind out more
To find out more about conservation on St Helena see:
- St Helena National Trust:
www.nationaltrust.org.sh
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.ukTopGlossary
- Umbel
- In plants, a usually umbrella-shaped flower cluster in which the individual flower stalks originate at roughly the same point.
References
- IUCN Red List (October, 2008)
http://www.iucnredlist.org/ - Steiner, S. and Liston, R. (2007) St Helena, Ascension and Tristan da Cunha, Second Edition. Bradt Travel Guides, UK.
- St Helena National Trust (February, 2008)
http://www.nationaltrust.org.sh/projects.html
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Image credit
Dwarf jellico, showing detail of the flowers and leaves
© Andrew Darlow
Andrew Darlow
a_darlow@hotmail.com
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