Lobelia dentata is a herb found in eastern Australia. The habitat is eucalyptus woodland and forest, often on sandy soils. An uncommon species, but it may be locally abundant after bushfires. Lobelia dentata grows as a slender, hairless plant, growing to 40 cm (16 in) high. The flowers form on a raceme and appear from March to November. The dark blue or purple flowers are small, but create a spectacular sight with their abundance and beauty. The specific epithet dentata refers to the "toothed leaves". The leaves are 1 to 4 cm long, and 3 to 10 mm wide. The fruiting capsule is 4 to 7 mm long, and 4 mm in diameter.