Persicaria Mill.

Stipules entire when young, pale brown Persicaria
Flowers in dense hemispherical heads c. 1 cm diam.; perianth pink. Leaves ovate-lanceolate, 1–2 cm long with a dark brown zone across the upper surface, often tinged with red underneath. Trailing plant. Garden escape near habitation. Introd. from Himalayas. Fl. summer Persicaria capitata
Flowers in spikes or spike-like racemes; if dense then more than 1 cm long