Araucaria excelsa

Names and Synonyms

Common Names

• Norfolk Island Pine
• Star Pine
• Norfolk Island-pine
• Norfolk Island araucaria

Scientific Names

Accepted name

Synonyms

• Eutassa heterophylla
• Araucaria excelsa var. glauca
• Eutacta excelsa var. glauca
• Eutacta excelsa var. monstrosa
• Eutacta excelsa var. variegata-alba
• Eutacta excelsa var. aurea-variegata
• Araucaria excelsa var. speciosissima
• Pinus columbaria
• Abies columbaria

Regional and Traditional Names

Sources: Wikidata, Catalogue of Life

Taxonomical Classification

This plant belongs to the kingdom Plantae and is classified under the phylum Streptophyta and the class Equisetopsida. Within the subclass Pinidae and order Pinales, it is further categorized into the family Araucariaceae. Finally, its specific taxonomic placement is within the genus Araucarica.

Sources: The World Checklist of Vascular Plants (WCVP)

Distribution

This plant exhibits a scattered geographical distribution across several distinct oceanic and continental regions. In the Middle Atlantic Ocean, its presence can be noted on the remote island of Ascension. Moving toward the Indian Subcontinent, it is found within the borders of Bangladesh. The species also reaches the Pacific, specifically inhabiting the Norfolk Islands near Australia. Finally, its range extends to the northern parts of New Zealand.

Sources: The World Checklist of Vascular Plants (WCVP)

Botanical Identification

Ecology

The ecology of Araucaria heterophyllas is characterized by a broad altitudinal distribution and specific environmental preferences. This species thrives across a diverse vertical gradient, occupying an elevational range that begins as low as 10 m AMSL and extends to a maximum of 2750 m AMSL. Its habitat is predominantly coastal, where it integrates into maritime ecosystems, though its ability to inhabit varying elevations allows it to persist in both lowland seaside environments and high-altitude montane landscapes.

Elevational range max:

2750 m AMSL

Elevational range min:

10 m AMSL

Habitat :

Coastal

Life history

The life history of Araucaria heterophyllas is characterized by its status as a perennial organism, ensuring a long-lived presence within its ecological niche. As a phanerophyte, specifically classified under both phanerophyte life forms, the plant maintains its buds well above the ground level, typically forming large, woody structures that support its growth over many years. Its foliage remains consistent throughout the seasons as an evergreen, providing continuous photosynthetic activity without the need for seasonal leaf shedding.

Deciduousness :

evergreen

Life form :

phanerophyte

Lifecycle :

perennial

Morphology

The morphology of Araucaria heterophylla is characterized by its robust growth form as a woody tree. It is a terrestrial, self-supporting species that functions as an independent organism, lacking any parasitic or epiphytic tendencies. As a large tree, it exhibits significant vertical development, with a mean plant height of approximately 17.5 m, though it is capable of reaching a maximum height of up to 70 m.

Aquatic :

terrestrial

Climber :

self-supporting

Epiphyte :

terrestrial

Growth form :

tree

Parasite :

independent

Plant height max:

70 m

Plant height mean:

17.5 m

Woodiness :

woody

Physiology

The physiology of Araucaria hetero phyllia is characterized by a C3 photosynthetic pathway, which governs its carbon fixation processes and metabolic efficiency. The morphological aspects of its foliage play a critical role in its gas exchange and light interception, with leaves typically measuring between 1 cm and 1.25 cm in length. These leaves are relatively narrow, exhibiting a width ranging from a minimum of 0.3 cm to a maximum of 0.6 cm. Furthermore, the plant does not function as a nitrogen fixer, meaning it relies on the uptake of available nitrogen from the soil rather than through symbiotic biological nitrogen fixation.

Leaf length max:

1.25 cm

Leaf length min:

1 cm

Leaf width max:

0.6 cm

Leaf width min:

0.3 cm

Nitrogen fixer :

no

Photosynthetic pathway :

C3

Reproduction

The reproduction of Araucaria heterophylla is characterized by a strictly sexual process, as asexual reproduction is absent. The plant relies on abiotic pollination mechanisms, specifically utilizing wind as its primary pollination syndrome. In terms of reproductive structures, the fruit exhibits a mean length and width of 10 cm. Following fertilization, the seeds are produced with a mean mass of approximately 1.1295586 g, though individual seed mass can vary, ranging from a minimum of 1.744586 g to a maximum of 2.5 g. The dispersal syndrome of the species is classified as anemochorous, meaning the seeds are dispersed via wind. Furthermore, the species exhibits a lack of self-fertilization, necessitating cross-pollination to ensure genetic diversity.

Dispersal syndrome :

anemochorous

Fruit length mean:

10 cm

Fruit width mean:

10 cm

Pollination syndrome :

wind

Pollination syndrome :

abiotic

Reproduction asexual :

absent

Seed mass max:

2.5 g

Seed mass mean:

1.1295586 g

Seed mass min:

1.744586 g

Self fertilization :

absent

Sources: Global Inventory of Floras and Traits (GIFT)

Activities

Araucaria heterophylla has 2 reported activities identified across 0 scientific publications and several other databases. The most consistently reported activities include Phytotoxic, Repellent.

Phytotoxic

1. Chemistry & biodiversity

Repellent

1. Chemistry & biodiversity

Preparations

Araucaria heterophylla has 4 reported preparations identified across 0 scientific publications and several other databases. The most consistently reported preparations include EO, REO, nanoemulsion formulations of Araucaria heterophylla and Azadirachta indica leaf extracts, resin essential oil.

Eo

1. Chemistry & biodiversity

Reo

1. Chemistry & biodiversity

Nanoemulsion formulations of araucaria heterophylla and azadirachta indica leaf extracts

1. Scientific reports

Resin essential oil

1. Chemistry & biodiversity