Rosa sericea pteracantha (Species) I have seen flowers of this species with 4, 5, 6, 7,...10 and more petals some years. Here are two blooms with six petals, and one each with four and five.

3/28/2004 - SJH

3/28/2004 - SJH

3/28/2004 - SJH

3/20/2001 - SJH

2001 SJH

2001 SJH