Sometimes plants are sufficiently similar to one another that the procedures used by 18th-century scientist Carl Linnaeus for distinguishing species are insufficient.

Stems are thick and densely hairy and its flowers are small, yellow and daisy-like. Plants emit a strong odour when crushed.

The plants are 'cryptic', they look identical, with similar leaves and flowers, and have the same growth habit and ... an ...

Weeds pop up in all climates and growing conditions, and not everyone knows the right way to get rid of them. And despite the ...

Icons of beauty, providers of sustenance, even symbols of divinity — blossoming plants have assumed a deep significance to ...