The upright spurge is an annual herb, widespread throughout Europe but uncommon in the UK where it is found mainly in a small area around Gloucester.
Medusa's head is so named because of its numerous snake-like stems.
The large-leaved spindle is a shrub with scarlet fruits and brilliant red leaves in autumn.
One of the coral trees: a scarlet beauty with a sting in its tail.
Barrenwort is an evergreen, herbaceous perennial with stiff, heart-shaped leaflets and spikes of small, yellow flowers in spring.
Epimedium flavum is a herbaceous perennial with upright stems and bright yellow flowers, produced mainly in spring.
Oriental paper bush is a beautiful, winter-flowering scented shrub, which has bark valued for making high-quality paper in Japan.
Snake's head fritillary has stunning, chequer-patterned flowers, and has become quite rare in the wild.
Queen of the prairie is an attractive bog garden perennial, with clusters of rose-pink flowers and fragrant leaves.
Blue marguerite is a South African perennial, popularly cultivated for its bright blue flower heads.