richardsonia

from The Century Dictionary.

• noun A genus of gamopetalous plants, belonging to the order Rubiaceæ, the madder family, and to the tribe Spermacoceæ, characterized by three to four ovary-cells, as many style-branches, and a two-to four-celled fruit crowned with from four to eight calyx-lobes, the summit finally falling away from the four lobes or nutlets which constitute its base, and so discharging the four oblong and furrowed seeds.