紫万年青属（学名：Rhoeo）是鸭跖草科下的一个属，为粗壮、多年生草本植物。该属仅有紫万年青（Rhoeo discolor）一种，原产于热带美洲。

In Greek mythology, Rhoeo (/ˈriːoʊ/; Ancient Greek: Ῥοιώ) was a daughter of Staphylus and Chrysothemis, sister to Parthenos and Molpadia or Hemithea. Parthenius relates that she once experienced a great jealosy of her sister Hemithea when Staphylus arranged for the latter to spend a night with Lyrcus, his guest, whom both Hemithea and Rhoeo fell in love with.