Description. The root of this is long, thick, and furnished with many fibres. The stalk is firm, upright, of a brownish colour, and five feet high. The leaves are numerous, large, and divided at the edges; they are of a dusky green, and beset with sharp prickles. The flowers are large and purple, and frequently there is but one at the extremity of the stalk, which hangs drooping.
Place. It is very frequent in damp pastures.
Time. It flowers in June.