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.

GC: Rosa sericea v. pteracantha (1905)

Curtis's Botanical Magazine (1908)

3/28/2004 - SJH

3/28/2004 - SJH

3/28/2004 - SJH

3/20/2001 - SJH

2001 SJH

2001 SJH

April 2001 SJH