Actinomorphic: Having multiple planes of symmetry such that any line drawn through the middle produces two mirror-image halves, usually applied to flowers.* Compare with zygomorphic.
This striking red Dahlia ‘Mystic Enchantment’ in the Arrival Courtyard has actinomorphic flowers.
*Pell, S.K., Angell, B. (2016). A botanist’s vocabulary: 1300 terms explained and illustrated. Portland: Timber Press.