Latin plant names can often refer to the location where the plant grows or was first found, given that many plants were traded well before they were ascribed scientific names it can get a little confusing.
Formosa – Japan
Sinense – China
Brasiliensis – Brazil
Moluccana – Moluccas Islands,Indonesia which makes Eucalyptus moluccana (Coastal Grey Box) a little confusing as it’s home range is north east New South Wales roughly from the Newcastle area, it was mistakenly listed by William Roxborough (1832) as a native of the Molucca Islands
Canadensis – Canada
Americanum – America
Benghalensis – Bengal (India)
Camaldulensis – As in Eucalyptus camaldulensis (River Red Gum) named after L’Hortus Camaldulensis di Napoli a private garden in Naples, Italy from where the species was first described
Orientalis – from the East (not necessarily China)
Occidentalis – from the West
Notos – from the South