pleiotaxy
/ˈplaɪəˌtæksi/
noun
- An increase in the number of whorls or parts in a flower beyond the typical number, often resulting in double or multiple petals.
- Gardeners sometimes select for pleiotaxy to create fuller blooms.
- Pleiotaxy in this species produces flowers with up to 20 petals instead of the usual five.
- The rose's pleiotaxy gave it an unusually dense cluster of petals.