'youth-on-age' definitions:

Definition of 'youth-on-age'

(from WordNet)
noun
Vigorous perennial herb with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk [syn: pickaback plant, piggyback plant, youth-on-age, Tolmiea menziesii]

Definition of 'youth-on-age'

From: GCIDE
  • youth-on-age \youth`-on-age"\ n. (Bot.) A vigorous perennial herb (Tolmiea menziesii) with flowers in erect racemes and having young plants develop at the junction of a leaf blade and the leafstalk.
  • Syn: pickaback plant, piggyback plant. [WordNet 1.5]