Trollius is derived from trol, or trollen, an old German word signifying something round, in allusion to the globular form of the flowers.
T. Europaeus flowers in June and July. It has large lemon-yellow globular blossoms, on stems two feet high.
T. Asiaticus has dark orange flowers; one foot high; in June and July.
T. Americus is a dwarf indigenous species, with yellow flowers, in May; all flourish best in rich, moist soil. The two first are desirable border flowers.