Calectasia is a genus of about fifteen species of flowering plants in the family Dasypogonaceae and is endemic to south-western Australia.

Plants is this genus are small, erect shrubs with branched stems covered by leaf sheaths.

The flowers are star-shaped, lilac-blue to purple and arranged singly on the ends of short branchlets.

[7][8] The name is derived from the Ancient Greek words kalos " beautiful" and ektasis "development", alluding to the blue spreading perianth-tubes.

They occupy a variety of habitats, occasionally in seasonally swampy areas, but more usually in low heath or woodland on sand, or over laterite or granite.