Lobelia, also known as Indian Tobacco, is a genus in the family Campanulaceae, comprising some 200 species, some of which are cultivated in gardens. These include Lobelia cardinalis (Cardinal Flower or Indian Pink), Lobelia siphilitica (Blue Lobelia), Lobelia fulgens and Lobelia erinus, as well as some hybrids.

Some botanists place the genus and its relatives in the separate family Lobeliaceae. The Angiosperm Phylogeny Group did not make a firm decision in this, listing the genus under both families.

Lobelia erinus is an annual flowering plant often grown in window boxes and hanging baskets. Many varieties have been cultivated with a wide variety of colours.

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