lobelia
Concise Oxford English Dictionary © 2008 Oxford University Press:
lobelia /ləˈbiːlɪə/
▶noun a plant of the bellflower family, typically with blue or scarlet flowers. [Genus Lobelia: many species.]
– origin mod. L., named after the Flemish botanist Matthias de Lobel (1538–1616).
'lobelia' also found in these Oxford entries:

