choking

Common duckweed Lemna minor showing plant growing and close up of flower

Hedge bindweed Calystegia sepium with binding stems and showing species specific calyx and several large flowers along with the leaves

Giant hogweed Heracleum mantegazzianum study giving an impression of the enormous size of this tall umbellifer plant with its thick stems and froth of white flowers; details of individual flowers and seeds in colour, and one leaf illustrated in full colour