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Macadamia allergy is a type of food allergy to macadamia nuts which is relatively rare, affecting less than 5% of people with tree nut allergy in the United States. [24] Macadamia allergy can cause mild to severe allergic reactions, such as oral allergy syndrome , urticaria , angioedema , vomiting, abdominal pain, asthma , and anaphylaxis . [ 25 ]
Macadamia tetraphylla was the first Australian native food plant to be grown by non-indigenous Australians as a commercial crop. The first commercial plantation of macadamia trees were planted in the early 1880s by Charles Staff at Rous Mill, 12 km southeast of Lismore, New South Wales, consisting of M. tetraphylla. [4]
Macadamia integrifolia trees grow to 15 metres (49 ft) in height. The leaves are simple, oblong in shape, glossy, entire with wavy leaf margins and are 20 centimetres (8 in) long and 10 cm wide. [3] The flowers are white or pink followed by woody, edible rounded fruits [4] which are 2 to 3.5 cm in diameter.
Like other tree nuts, macadamia nuts take their sweet time growing. It takes about five to seven years before nuts start growing. Full production takes 12 to 15 years.
The H2 Hinde tree is the sole surviving of the three macadamia trees on Colliston that were tagged in 1948 by John McGregor Wills, and finally registered as scion wood and assigned cultivar names in 1960. Of the three originally tagged trees, only the H2 variety was used for commercial purposes.
Macadamia ternifolia (common names: small-fruited Queensland nut, gympie nut) [5] is a tree in the flowering plant family Proteaceae, native to Queensland in Australia, [2] [3] and is listed as vulnerable under the EPBC Act. [5] Macadamia ternifolia is a small multi-stemmed tree which grows up to 8 m
Macadamia jansenii is an endangered and poisonous tree in the flowering plant family Proteaceae, native to Queensland in Australia. [1] It was only described as a new species in 1991, being first brought to the attention of plant scientists in 1983 by Ray Jansen, a sugarcane farmer and amateur botanist from South Kolan in Central Queensland. [2]
The tree was first described in 1993 in the journal Australian Systematic Botany by Caroline Gross and Bernard Hyland as a species of Macadamia, but was transferred in 2008 in the American Journal of Botany by Peter Weston and Austin Mast to the new genus Lasjia, of which it is the type species.