4. Witches' hair (Cuscata)
Witches' hair (Cuscata), also known by the equally spooky name of strangleweed (and the less scary dodder), is a genus of over 200 different parasitic plants. It is native to tropical climates but also appear in temperate areas - including the UK. Cuscata is often identifiable as a mass of green, brown or orange spaghetti-like substance hanging from other trees. It lacks chlorophyll so it needs to feed from other plants (not unlike a vampire) to reproduce. Even stranger, Cuscata can identify the plants around it based on smell alone.