Westonbirt holds four plant collections of national significance
Gloucestershire's Westonbirt Arboretum has had several of its collections recognised as being of national importance for conservation.
Conservation charity Plant Heritage has singled out four more collections.
The bladdernuts, limes, maples and walnuts join the arboretum's Japanese maple cultivars in attaining the national status.
A spokesman for Westonbirt said: "It's wonderful to have been given this new status."
Curator Simon Toomer added: "We are delighted to have our standing officially recognised for such a great range of plant collections."
Mercy Morris, Plant Conservation Officer of Plant Heritage, said: "We are thrilled that Westonbirt has added so many collections this year."