An emergent perennial herb, found in shallow water or on exposed mud at the edge of a wide range of water bodies, although in many areas it is particularly frequent in canals. It is most frequent in eutrophic, calcareous water and rooted in a fine substrate. Lowland.
A perennial herb growing on exposed mud at the shallow edge of still or slow-flowing waters, or in marshes and swamps. It is confined to mesotrophic or eutrophic habitats. Plants fruit prolifically, and the species is a frequent colonist of newly cleaned ditches and recently flooded mineral workings. Generally lowland, but reaching 405 m at Dock Tarn (Cumberland).
A biennial or monocarpic herb, found in a wide range of habitats including disturbed woodland, woodland edges and clearings, shaded hedge banks, river-banks, the base of walls, road verges, waste ground, farmyards and gardens. It grows especially well on relatively fertile, moist soils, but avoids only the most acidic sites. Generally lowland, but reaching 535 m S. of Garsdale Head (N.W. Yorks.).
A robust, bulbous perennial herb of rank vegetation in sandy and rocky places near the sea, especially in old fields and hedge banks, on sheltered cliff-slopes, by paths and tracks and in drainage ditches and other disturbed places. Var. ampeloprasum reproduces mainly by seed, whereas the other varieties spread mainly by bulbils. Lowland.
A bulbous perennial herb which becomes naturalised by seed (var. pulchellum) or, perhaps more frequently, by bulbils (var. carinatum) in churchyards, rough and waste ground and on roadsides. Lowland.
A bulbous perennial herb, widely grown in gardens and also in fields and found as a relic of cultivation or a throw-out on rubbish tips, waysides and waste ground. This species is a fertile diploid. Lowland.
A bulbous perennial herb of dry, usually steeply sloping, calcareous grasslands, and on open sunny banks in river floodplains. 0-365 m (Dovedale, Derbys.).
A bulbous perennial herb, spreading by means of bulbils in a wide variety of, usually ungrazed, situations such as river-banks, roadsides, field margins, other rough and waste ground, and in woodland. Generally lowland, but reaching 375 m at Carter Bar (Roxburghs.).
A bulbous perennial herb, widely grown in gardens and also in fields, and found as a relic of cultivation or a throw-out on rubbish tips, waysides and waste ground. This species is fertile and usually tetraploid. Lowland.
A bulbous perennial herb of rough and waste ground, open rocky slopes, hedge banks and roadsides. Lowland.