1) Ligneous plant 2) Melilot 3) Sweet clover 4) Woody plant 1) Melilot 
Melilotus, known as Melilot, Sweet-clover and Kumoniga (from the Cumans), is a genus in the family Fabaceae. Members are known as common grassland plants and as weeds of cultivated ground. Originally from Europe and Asia, it is now found worldwide. This legume is commonly named for its sweet smell, which is due to its high content of the perfume a...
Melilotus is a genus of leguminous herbaceous plants with trifoliate leaves and loose racemes of yellow or white flowers, the petals of which soon fall off.
[n] - erect annual or biennial plant grown extensively especially for hay and soil improvement
melilot noun erect annual or biennial plant grown extensively especially for hay and soil improvement