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250 samples accessory Acer Aesculus hippocastanum analysis areas of Wales arvense Association of Bee-Keepers Asteraceae beekeepers bees Brassica Crataegus monogyna Brassica napus calculated nectar Calluna vulgaris Carduus sp Centaurea Central Association Chamerion angustifolium considered Derived nectar percentage distribution across Wales dominant in isolated early extracted Figure Filipendula ulmaria Gwynedd habitat heather hives honey production Impatiens glandulifera important minor source important nectar source Ligustrum vulgare long flowering season main nectar flow method of enclosure minor nectar sources nectar collected nectar sources available occurring percentage average/maximum plant species pollen grains pollen sources Powys produce a unifloral Pyrus sp Ranunculaceae rosebay willowherb Rubus fruticosus Rubus type Rubusfruticosus Salix sp samples were collected Secondary significant nectar single apiary source of late source of nectar species in samples spring-sown rape Taraxacum Tilia Trifolium pratense Trifolium repens Umbelliferae unifloral flow unifloral honey Vale of Glamorgan variations in nectar Viciafaba Voronoi diagram Welsh honey samples Welsh samples