Biology:Nestegis apetala

Short description: Species of tree

Coastal maire, ironwood
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Asterids
Order:	Lamiales
Family:	Oleaceae
Genus:	Nestegis
Species:	N. apetala
Binomial name
Nestegis apetala (Vahl) L.A.S.Johnson
Synonyms
Olea apetala Vahl. Olea endlicheri F.Muell. Gymnelaea apetala (Vahl) L.A.S.Johnson

Nestegis apetala is a small tree native to northern New Zealand and to Norfolk Island. The common names in New Zealand are coastal maire or broad-leaved maire. On Norfolk Island, the common name is ironwood. The species name apetala refers to the lack of petals on the flowers.

Distribution

In New Zealand N. apetala grows on the North Island mainland on rocky headlands around Whangarei Heads and at the Bay of Islands. It is also found on northern offshore islands including the Hen and Chickens Islands, Great Barrier Island, Little Barrier Island, and the Poor Knights Islands. It tends to be rare on islands with rats. On Norfolk Island, it is common on Mt Pitt, and in forested areas generally, but is less common elsewhere.

Description

Foliage and olive-like fruit of Nestegis apetala

Nestegis apetala is shrub or tree up to 6 m tall, with smooth, shiny dark green leaves 4.5 to 12 cm long and 1.5 to 4 cm wide. Juvenile leaves are larger, up to 14 cm long by 8.5 cm wide. The leaves are often wavy, and are borne on leaf stems about 10 mm long. The flowers of N. apetala arise in racemes of up to 21 flowers growing from the leaf axils or directly from the branchlets. The individual flowers are each about 2.5 mm in diameter, and lack petals. The fruit is a drupe 9 mm long, red or yellow, less commonly purple when ripe. The New Zealand Plant Conservation Network lists the plant as 'At Risk'.

Threats

Young plant of Nestegis apetala grown for sale in New Zealand

The fruit and seeds of N. apetala are palatable to rats. Research in New Zealand has shown that the eating of the seeds by kiore (Pacific rats) substantially reduces the population of the tree. Kiore were introduced by Māori sometime in the last 1,000 years and became widespread on the three main islands, and reached many of the offshore islands. At present, Coastal maire is quite a rare tree on the mainland, but this research indicates that it is probable that before the introduction of kiore, it would have been a much more common component of the coastal forests of the northern North Island. Seedlings or saplings of N. apetala are uncommon or rare on off-shore islands such as Hen Island and Lady Alice Island where kiore are present, and abundant on islands such as Tawhiti-rahi and Aorangi in the Poor Knights group where they are absent. Three years after the eradication of kiore from Cuvier Island, seedlings of N. apetala became common near mature trees. However, the scarcity of fruiting trees on modified islands slows seed dispersal and population recovery. (Campbell et al., 1999:282-4).

Cultivation and uses

Nestegis apetala is an attractive small tree noted for its hard timber. The berries are eaten by birds. In New Zealand it is available from specialist nurseries.

References

• Salmon J T, The Native Trees of New Zealand, AH & AW Reed, Wellington, New Zealand, 1973. ISBN:0-589-01340-8
• "Nestegis apetala". Flora of Australia Online. http://www.anbg.gov.au/abrs/abif/flora/stddisplay.xsql?pnid=5837. Retrieved 2007-07-20. 
• "Nestegis apetala (J.Vahl) L.A.S.Johnson". Australian Plant Name Index (APNI). http://www.anbg.gov.au/cgi-bin/apx?taxon_id=108826. Retrieved 2007-07-20. 
• D. J. Campbell, I. A. E. Atkinson (1999). "Effects of kiore (Rattus exulans Peale) on recruitment of indigenous coastal trees on northern offshore islands of New Zealand". Journal of the Royal Society of New Zealand 29 (4): 265-290. doi:10.1080/03014223.1999.9517597. 

Wikidata ☰ Q16986498 entry