Tragopogon dubius is only hardly distinguishable from Tragopogon minor. Criteria by trend are: In Tragopogon dubius the upper part of the stem below the flower head is thickened like a cudgel, which is not the case in Tragopogon minor (but sometimes the swelling of Tragopogon dubius can evolve only later during flower, on the other hand Tragopogon minor can have a light swelling, too). When flowering starts, the edges of the green petals of Tragopogon minor are tinged with red (which is not necessarily the case at every flower, and the red color is fading during flower time).