Spines on under surface of leaf - close-up

Descrission:

Longitude (deg): -2.4. Latitude (deg): 50.6. Longitude (deg/min): 2° 30' W. Latitude (deg/min): 50° 40' N. Vice county name: Dorset. Vice county no.: 9. Country: England. Stage: In flower. Identified by: Malcolm Storey. Comment: "very spiny plant, in flower on built bank by basin". Category: standard photograph or close-up. Photographic equipment used: Canon EOS400D dSLR with Tamron SP AF Di 90mm Macro 1:1 lens.