Conoclinium coelestinum, commonly known as blue mistflower,[2] mistflower,[3] wild ageratum,[4] or blue boneset,[5] is a North American species of herbaceous perennial flowering plant in the family Asteraceae.

[6] Conoclinium coelestinum normally grows to a height of 30–76 cm (1–2.5 ft) with round, light green stems and a few or numerous branches.

[7] Flat-topped clusters, or panicles, of blue, purple, or lavender flowerheads, measuring 3–8 cm (1–3 in), are located at the end of the stems.

Each flowerhead consists of about 40-50 disk florets with tiny tubular corollas that have 5 spreading lobes.

[5] This species prefers moist soils and can be found in wood edges, sandy woodlands and clearings, wet meadows and stream banks.