Weed identification is a scientific way of making sense of weed biodiversity.
A species-group is a group of closely related species usually with partially overlapping ranges. So as you learn your species in this section, be aware that variants, hybrids, biotypes, ecotypes, phenotypes, mutants and lots of other forms of a species make weed biodiversity the first principle of weed identification. The first step in managing weeds is to correctly identify the plant pests you want to manage. Different weed species, and even variants within a single weed species, respond to management tactics very differently. Correct identification is fundamental to weed management.