A small genus of North American plants. Stems shrubby or herbaceous. Flowers tetramerous. Stamens 8, equal. Anthers opening by a terminal pore, spurred at the base. About six species are known. The name is of Greek origin.

1. R. Virginica. Meadow Beauty. - The only species of this large order that is cultivated in the open air in this country, and this is extremely rare, and difficult to grow, requiring a moist sandy bog-earth. It is an herbaceous plant about a foot high with angular winged stems, sessile lanceolate leaves with bristly teeth, and terminal or axillary clusters of rosy flowers, appearing in June or July.