Find in A-Z:
Odontites vernus (Red Bartsia) Latest year: 2007 [Draft Account]
Odontites vernus ssp. serotinus (a red bartsia) Latest year: 2004 [Draft Account]
Odontites vernus ssp. vernus (a red bartsia) Latest year: 1977 [Draft Account]
Oenanthe aquatica (Fine-leaved Water-dropwort) Latest year: 2002 [Draft Account]
Oenanthe crocata (Hemlock Water-dropwort) Latest year: 2007 [Draft Account]
Oenanthe fistulosa (Tubular Water-dropwort) Latest year: 2002 [Draft Account]
Oenanthe fluviatilis (River Water-dropwort) Latest year: 2006 [Draft Account]
Oenanthe silaifolia (Narrow-leaved Water-dropwort) Latest year: 2001 [Draft Account]
Oenothera biennis (Common Evening-primrose) Latest year: 2006 [Draft Account]
Oenothera cambrica (Small-flowered Evening-primrose) Latest year: 2006 [Draft Account]
Oenothera glazioviana (Large-flowered Evening-primrose) Latest year: 2006 [Draft Account]
Oenothera rubricaulis (an evening-primrose) Latest year: 1974 [Draft Account]
Oenothera x fallax (Intermediate Evening-primrose) Latest year: 2006 [Draft Account]
Onobrychis viciifolia (Sainfoin) Latest year: 2003 [Draft Account]
Ononis alopecuroides (Salzman's Restharrow) Latest year: 1968 [Draft Account]
Ononis repens (Common Restharrow) Latest year: 2006 [Draft Account]
Ononis repens x spinosa (O. x pseudohircina) (Hybrid Rest-harrow) Latest year: 2004 [Draft Account]
Ononis spinosa (Spiny Restharrow) Latest year: 2006 [Draft Account]
Onopordum acanthium (Cotton Thistle) Latest year: 2004 [Draft Account]
Ophioglossum vulgatum (Adde''s-tongue) Latest year: 2007 [Draft Account]
Ophioglossum vulgatum sens. lat. (Adder's Tongue) Latest year: 2004 [Draft Account]
Ophrys apifera (Bee Orchid) Latest year: 2007
Ophrys insectifera (Fly Orchid) Latest year: 2004
Orchis mascula (Early-purple Orchid) Latest year: 2007
Orchis morio (Green-winged Orchid) Latest year: 2003
Orchis ustulata (Burnt Orchid) Latest year: 2004
Oreopteris limbosperma (Lemon-scented Fern) Latest year: 2006 [Draft Account]
Origanum vulgare (Wild Marjoram) Latest year: 2007
Ornithogalum angustifolium (Star-of-Bethlehem) Latest year: 2005 [Draft Account]
Ornithogalum nutans (Drooping Star-of-Bethlehem) Latest year: 1825 [Draft Account]
Ornithopus perpusillus (Bird's-foot) Latest year: 2002 [Draft Account]
Orobanche minor (Common Broomrape) Latest year: 2002 [Draft Account]
Orobanche purpurea (Yarrow Broomrape) Latest year: 1969 [Draft Account]
Orobanche rapum-genistae (Greater Broomrape) Latest year: 1969 [Draft Account]
Osmunda regalis (Royal Fern) Latest year: 1970 [Draft Account]
Oxalis acetosella (Wood-sorrel) Latest year: 2007
Oxalis articulata (Pink-sorrel) Latest year: 2005 [Draft Account]
Oxalis corniculata (Procumbent Yellow-sorrel) Latest year: 2006 [Draft Account]
Oxalis debilis (Large-flowered Pink-sorrel) Latest year: 1999 [Draft Account]
Oxalis exilis (Least Yellow-sorrel) Latest year: 2000 [Draft Account]
Oxalis latifolia (Garden Pink-sorrel) Latest year: 1991 [Draft Account]
Oxalis stricta (Upright Yellow-sorrel) Latest year: 2004 [Draft Account]