Trimeris scaevolifolia

Taxonomy

Assessment Information

Geographic Range

Population

Habitat and Ecology

Threats

Conservation Actions

Taxonomy [top]

Kingdom	Phylum	Class	Order	Family
PLANTAE	TRACHEOPHYTA	MAGNOLIOPSIDA	CAMPANULALES	CAMPANULACEAE

Scientific Name:	Trimeris scaevolifolia
Species Authority:	(Roxb.) Mabb.

Assessment Information [top]

Red List Category & Criteria:	Endangered D ver 3.1
Year Assessed:	2003
Assessor/s	Cairns-Wicks, R.
Evaluator/s:	Cronk, Q. & Clubbe, C. (South Atlantic Island Plants Red List Authority)
Justification: Although alien plant control in the area of Diana’s Peak National Park has increased the amount of disturbed and open areas available for the Lobelia to spread, the Lobelia is short-lived, numbers fluctuate, and individuals quickly disappear in overgrown places. The vegetation in the Peaks is lush and ferns and exotics quickly colonize disturbed and open area. More detailed study of this species is needed to determine population size and structure and monitor trend.

Geographic Range [top]

Range Description:	Trimeris scaevolifolia is found on central ridge above 700 m,with patchy distribution within Diana's Peak National Park (including Cuckhold's Point and Mt Actaeon). T. scaevolifolia is also found at High Peak and Depot. Alien plant control has taken place in the area of Diana’s Peak National Park since 1995, this management has provided an opportunity for the Lobelia to spread along pathsides and cleared areas. In contrast it is inferred that T. scaevolifolia numbers have declined at High Peak and the Depot where invasives control has been less. Wherever it occurs, numbers are small. The High Peak lobelia’s could be considered a subpopulation being significantly disjunct from the National Park subpopulation. Q.C.B. Cronk (Cronk 2000) estimates there to be less than 250 mature individuals.
Countries:	Native: Saint Helena

Range Description:

Trimeris scaevolifolia is found on central ridge above 700 m,with patchy distribution within Diana's Peak National Park (including Cuckhold's Point and Mt Actaeon). T. scaevolifolia is also found at High Peak and Depot. Alien plant control has taken place in the area of Diana’s Peak National Park since 1995, this management has provided an opportunity for the Lobelia to spread along pathsides and cleared areas. In contrast it is inferred that T. scaevolifolia numbers have declined at High Peak and the Depot where invasives control has been less. Wherever it occurs, numbers are small. The High Peak lobelia’s could be considered a subpopulation being significantly disjunct from the National Park subpopulation. Q.C.B. Cronk (Cronk 2000) estimates there to be less than 250 mature individuals.

Countries:

Native:

Saint Helena

Population [top]

Population Trend:	Increasing

Population Trend:

Increasing

Habitat and Ecology [top]

Habitat and Ecology:	T. scaevolifolia grows alongside cabbage trees, Carex dianae, ferns and tree ferns of the uplands vegetation. Lobelia regenerates best in disturbed open habits, along pathsides etc. It is relatively short-lived and disappears from overgrown places (Cronk 2000).
Systems:	Terrestrial

Threats [top]

Major Threat(s):	The main threat to this species is competition from introduced invasive species. Alien plant control programme for Diana’s Peak National Park has reduced this threat and improved habitat quality by providing disturbed open areas for it to spread into. The restricted area of the Park, 81 hectares means that this species will always have a restricted area of occupancy.

Major Threat(s):

The main threat to this species is competition from introduced invasive species. Alien plant control programme for Diana’s Peak National Park has reduced this threat and improved habitat quality by providing disturbed open areas for it to spread into. The restricted area of the Park, 81 hectares means that this species will always have a restricted area of occupancy.

Conservation Actions [top]

Conservation Actions:	The largest extent of occurrence of T. scaevolifolia lies within Diana’s Peak National Park, which is protected within the Revised Strategic Land Use Plan (1998/9) and managed under the Environmental Conservation Section of the Agriculture and Natural Resources Department. The Diana’s Peak National Park Management Plan for 1996-2001 requires revision. Trimeris scaefolifolia is also protected under the Endangered Endemic and Indigenous Species Protection Ordinance No 7 of 1996.

Conservation Actions:

The largest extent of occurrence of T. scaevolifolia lies within Diana’s Peak National Park, which is protected within the Revised Strategic Land Use Plan (1998/9) and managed under the Environmental Conservation Section of the Agriculture and Natural Resources Department. The Diana’s Peak National Park Management Plan for 1996-2001 requires revision. Trimeris scaefolifolia is also protected under the Endangered Endemic and Indigenous Species Protection Ordinance No 7 of 1996.

Citation:	Cairns-Wicks, R. 2003. Trimeris scaevolifolia. In: IUCN 2008. 2008 IUCN Red List of Threatened Species. <www.iucnredlist.org>. Downloaded on 02 December 2008.
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