Coleostephus myconis is an annual plant that reaches a height of 20–50 centimetres (8–20 in).

[2] Inflorescences are orange-yellow, about 2–3 centimetres (0.8–1.2 in) wide, solitary and terminal.

[3] C. myconis occurs in the Mediterranean region of southern Europe.

It usually grows in grassy fields, at altitudes of 0–800 metres (0–2,625 ft).

[3] It has also been introduced in the south of Brazil, Argentina and Uruguay, where it is considered an invasive species.