Eucalyptus radiata Sieber ex DC. - Myrtaceae - narrow-leaf peppermint gum, narrow-leaved peppermint, Schmalblättriger Pfefferminz-Eukalyptus
Tree, up to 45m high, native to Australia, cultivated elsewhere (South Africa); bark shortly fibrous („peppermint“), grey to grey-brown, shedding in long ribbons; young leaves sessile, opposite, broad lanceolate or lanceolate, green; adult leaves alternate, petiolate, lanceolate to narrow lanceolate, olive green;
Eucalyptus radiata Sieber ex DC subsp. radiata = Eucalyptus radiata subsp. robertsonii.: Forth river peppermint, Robertson's peppermint
26 compounds have been identified in 23 E.radiata leaf essential oil samples from South Africa (yield 0.14-4.31%). The highest essential oil yields can be obtained during spring/summer months (high rainfall and high temperature conditions) from mature leaves. Major compounds were 1,8-cineole (65.7% ± 9.5), α-terpineol (12.8% ± 4.4) and limonene (6.5% ± 2.4).
Literature shows that 1,8-cineole (69.5-82.6%) was also major component in E.radiata oils from Australia, India, Zambia, Germany, and Tunisia. Minor components were α-terpineol (7.0-12.4%), α-pinene (0-11.9%), and limonene (0-7.3%).
[Mahumane, Gillian Dumsile. Antimicrobial activity and chemical analysis of eucalyptus radiata leaf essential oil. Diss. 2016]
Eucalyptus radiata A. Cunn. ex DC.
Memoires de la Société de physique et d’histoire naturelle de Genève, vol.9 t.7 (1841-1842) [J.C.Heyland]