Rosa sericea ssp. omeiensis f. pteracantha
Common name: Mt. Omei rose, wingthorn rose
Rosa sericea ssp. omeiensis f. pteracantha is a large shrub rose growing in the south camellia bed; in mid-summer, its enormous translucent prickles look like rubies when back lit by the sun. R. omeiensis (sometimes treated as a subspecies of R. sericea) is the only rose with four petals.
Stem photo: Lokal_Profil, creativecommons.org
Flower photo: Krzysztof Golik, creativecommons.org
Prickles photo by Midge Oke