A small genus of Chinese and Japanese origin. Erect hairy herbs. Leaves alternate, ovate or cordate, and stem-clasping. Flowers in terminal panicles. Perianth six-parted, the segments forming a ball, clawed, the three outer bulging at the base. From three, and

swollen or hump-backed, referring to the outer perianth-lobes.

1. T. hirta. - A hardy plant with broad sessile ovate-acuminate shining nervose leaves. Flowers large, in terminal umbels, white thickly spotted with purple.