- Source: Lobelia tenuior
- Daftar spesies Lobelia
- Lobelia tenuior
- List of Lobelia species
- Neopasiphae simplicior
- Lake Cooloongup
- Kensington Bushland Reserve
- List of Australian plant species described by Robert Brown
- List of the vascular plants in the Red Data Book of Russia
- List of plants in the Gibraltar Botanic Gardens
- List of flora of the Sonoran Desert Region by common name
- List of IUCN Red List Vulnerable plants
Lobelia tenuior, commonly known as slender lobelia, is a small herbaceous plant in the family Campanulaceae native to Western Australia.
The erect, slender and annual herb typically grows to a height of 0.15 to 0.5 metres (0.5 to 1.6 ft). It blooms between October and January producing blue flowers.
The species is found on sand dunes, among coastal limestone and in lowlying areas along the coast of the South West and Great Southern regions of Western Australia where it grows in sandy soils.