|
1. |
Clapham AR Tutin TG Warburg EF,1962 | |
| Flora of the British Isles Second Edition |
|
12. |
Johns, C.A. Rev.,1953 | |
| British Trees, Routledge. |
|
13. |
Rose,F.,1981 | |
| The Wild Flower Key, Warne. |
|
14. |
Stace,C.A.,1991 | |
| A New Flora of the British Isles, Cambridge. |
