Root meanings of plant names:
Ageratum from the Greek ëaí (without) and ëgerasí (age) for long-lasting flowers.
Gypsophila from the Greek ëgypsosí (lime) and ëphilosí (loving) for alkaline soil preference.
Hemerocallis from the Greek ëhemeraí (day) and ëcallosí for the flowers that each last but for a day.
Philodendron from the Greek ëphileoí (to love) and ëdendroní a tree for the many plants in this genus that have a vining growth habit.