American mint (Mesosphaerum suaveolens [Syn: Hyptis suaveolens])

An introduced weed common in wastelands, roadsides, coconut plantations etc. from sea level to about 525m a.s.l. It is a native plant of tropical America. 

ගැට තුඹ[Geta-tumba] (Leucas zeylanica)

Very common indigenous herb found along roadsides and waste lands of both low country wet and dry zones up to about 1700m elevation. Flowering throughout the year. Leaves edible and eaten as a vegetable. Leaf size variable.

හීන්තලා[Heen-tala]/American basil/Hoary basil ( Ocimum americanum)

An indigenous annual herb of waste grounds, road sides and such other places in low country dry zone. The leaves have pleasant camphor like scent.