Weed can classified in many ways. Some important classifications of weeds are as follows.
01.Classification according to the number of cotyledon which seeds have.
Broad Leaves & Other Grasses
Table 01- Classification of weeds according to cotyledon
Brod Leaves Weeds – These are dicotyledon plants with net leaves Eg:- Lantana Camara
Grasses – These are monocotyledon plants which have long & rounds shallow stems. Propagation is by stem,root & seeds include Graminae family. Plant vary with size & life time as annuals & perennials.Mostly these plants are consisted with oval shape, flat stem, fleat blade & sheath leaves are long linear parallel veination leaf legule is present.
Sedges – These are slimiar to grass,but they have ranked leaves & tranguler solid stems. They frequently have modified rhizomes for strong & propagation also by seeds and cuttings. Eg:- Cyperus iria (Thunessa)
02. Classification according to the growth habit
Table 02 – Classification of weeds according to growth habit
03. Classification according to the body texture
Table 03 – Classification according to the body texture
04. Classification of weed based on life span
Plants which complete life span within one year
< 1 Year >
Complete life span within two years
< 2 years >
Take more than two years to complete life span
> 2 years
Table 04 – Classification of weed based on life span
05. Classification of weeds according to the habitat
A terrestrial plant is a plant that grows on, in, or from land. Other types of plants are aquatic, epiphytic and lithophytic.
An epiphyte is an organism that grows on the surface of a plant and derives its moisture and nutrients from the air, rain, water or from debris accumulating around it. Epiphytes take part in nutrient cycles and add to both the diversity and biomass of the ecosystem in which they occur, like any other organism.
Aquatic plants are plants that have adapted to living in aquatic environments. They are also referred to as hydrophytes or macrophytes to distinguish them from algae and other microphytes. A macrophyte is a plant that grows in or near water and is either emergent, submergent, or floating.
Table 05 – Classification of weeds according to the habitat
06. Classification accounting to association of weeds
Crop bound weeds
Crop bound weeds: Weeds which usually parasite the host crop partially or fully for their nourishment i.e parasitism also called as parasitic weeds. Those parasites which attack roots are termed as root parasites and those which attack shoot of other plants are called as stem parasites.
Crop associate weeds
Crop associated weeds: such weeds grow along with the crop due to their requirement of microclimate and habitat and survive along the crop in form of mimicry.Eg. Amaranthus viridis and are associated with rice
Table 06 – Classification according to association of weeds