Robuta

https://www.rhs.org.uk/plants/513790/bistorta-affinis-darjeeling-red/details Bistorta affinis 'Darjeeling Red' | knotweed 'Darjeeling Red' Alpine Rockery/RHS bistorta affinis red knotweed darjeeling alpine rockery https://www.rhs.org.uk/plants/513868/bistorta-carnea/details Bistorta carnea | pink-flowered bistort Herbaceous Perennial/RHS herbaceous perennial bistorta carnea pink flowered https://www.rhs.org.uk/plants/513864/bistorta-amplexicaulis-summer-dance/details Bistorta amplexicaulis 'Summer Dance' | red bistort 'Summer Dance' Herbaceous Perennial/RHS bistorta amplexicaulis summer dance herbaceous perennial red rhs https://www.rhs.org.uk/plants/389139/bistorta-amplexicaulis-cottesbrooke-gold/details Bistorta amplexicaulis 'Cottesbrooke Gold' | red bistort 'Cottesbrooke Gold' /RHS bistorta amplexicaulis cottesbrooke gold red rhs https://www.rhs.org.uk/plants/513883/bistorta-yunnanensis/details Bistorta yunnanensis | /RHS bistorta yunnanensis rhs https://www.rhs.org.uk/plants/513824/bistorta-amplexicaulis-clent-rose/details Bistorta amplexicaulis 'Clent Rose' | /RHS bistorta amplexicaulis clent rose rhs https://www.rhs.org.uk/plants/389140/bistorta-amplexicaulis-pink-knot/details Bistorta amplexicaulis 'Pink Knot' | red bistort 'Pink Knot' Herbaceous Perennial/RHS bistorta amplexicaulis herbaceous perennial pink knot red https://www.rhs.org.uk/plants/513867/bistorta-amplexicaulis-white-eastfield/details Bistorta amplexicaulis 'White Eastfield' | red bistort 'White Eastfield' Herbaceous Perennial/RHS bistorta amplexicaulis herbaceous perennial white eastfield red https://www.rhs.org.uk/plants/389141/bistorta-amplexicaulis-atrosanguinea/details Bistorta amplexicaulis 'Atrosanguinea' | red bistort 'Atrosanguinea' Bogs/RHS bistorta amplexicaulis red bogs rhs