Cleome is an annual flower that produces an abundance of viable seed that germinates and becomes a weed in future plantings. Weeds are first classified botanically, and then by their life cycles. These are the leaves that are produced by the germinating seed. All of the turf grasses and weed grasses are monocots. All of the broadleaved weeds are dicots.
Sedges are in a group that is distinct from monocots and dicots.
The significance of classifying weeds into these groups is that their physical structure and biochemical reactions are different enough that herbicides have been developed that can selectively control one group without injuring the others. The herbicide 2,4-D can be applied over the top of turfgrasses to control dandelion, without hurting the turfgrasses, while sethoxydim can be applied over the top of annual flowers to control grasses growing around them. Without knowing and understanding the differences between weeds you cannot develop effective and efficient weed control programs. Biennial Annual weeds complete their life cycles in one growing season. That means they germinate from a seed, grow vegetatively, and produce flowers and viable seed all within one year.