Bidens pilosa

Bidens pilosa is a fine grass that can grow to 1m in height which produces small yellow flowers that develop into small black fruits. Its other name of "cobbler's pegs" comes from the tiny hooks on its surface that make it stick to most objects, enabling it to be dispersed over wide areas, for example by catching onto animal fur. Originating from Latin America, it is traditionally eaten as a legume and used in medicine to treat infections in many countries.