In this period most of the flowers are faded now, and the fruits of the plants are ready to play their role: to build a new plant.
To not compete with the plant 'mother', the fruit must be capable of being carried away before the seed is ground: for this purpose is used an infinite number of tricks, you can entrust the seed to the wind, as the clematis, or cover the seed of a tasty pulp so that a animal eats it, then storing it in the faeces, thus adding the bonus of a little 'manure fertilizer!
But the strategies do not end here for sure.
The Bidens bipinnate, also known as scissors, is a plant of the Asteraceae (or Compositae, depending on the scientific fashion of the moment ...) that grows on poor soils such as roadsides, materials landfill and developing a fallow vegetable gardens up to a meter tall, bipinnate leaves (hence the species name) and the heads of yellow flowers.
Usually Asteraceae pappus develop un'infruttescenza call: the seed is attached a series of filaments thin that allows it to be transported by the wind-an example familiar to all of us is given by the head.
The seeds of Bidens rather not use the wind to get carried, but the fur of animals! Anyone bringing their dog for a walk leaving him free to run in the grass well know this annoying ploy!
To stick to the hair (or even the shoelaces and sweatshirts!) The seed, an achene about half an inch long, has two or three small arpioncini - hence is the genus name, Bi-dens = two teeth.
Each of the teeth, called the remainder, a series of stiff hairs that work like little hooks.
Roe deer, fox, dog or the man that you stick those seeds will take them with him, away from the plant that created them, until perhaps a bump or scratching for annoyance (seeds sting a bit '!) if they deliver by delivering to the ground and allowing a new plant to be born.
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