Literature references

2 literature references:

Author: Stace,C.
Year: 1991
Title:
Source: New Flora of the British Isles.Cambridge Univ.Press
Author: Seannell,M.J.P. & Syunott,D.M.
Year: 1987
Title:
Source: Census catalogue of the flora of Ireland,ed.2.Sttnry Off.Dub