geranium (Pelargonium inquinans)
Refers specifically to the species Pelargonium inquinans, often called a geranium in English. In Japanese, ゼラニウム is a more common general term for geraniums/pelargoniums.
See also: ゼラニウム
The geranium (Pelargonium inquinans) is a plant native to South Africa.
I planted a geranium in the garden.