Equisetum x geissertii is the triple hybrid Equisetum hyemale x Equisetum x meridionale, which corresponds to Equisetum hyemale x Equisetum ramosissimum x Equisetum variegatum.
The plant occurs at few locations of the Upper Rhine valley in Baden (Germany, Baden-Württemberg). Differences to the similar Equisetum x alsaticum are that the bards at the sheaths are becoming brighter towards the tip, and the whole plants tend to be more dainty, both are influences of Equisetum variegatum. At the somewhat swollen sheaths the involvement of Equisetum ramosissimum becomes obvious. Opposite to the similar Equisetum x trachyodon the teeth of the sheaths have no hook-shaped coverings of silicate.