වල් තේ කොළ [Wal te kola]Ceylon tea/Spanish needle/Beggar's tick (Bidens pilosa [Syn: Bidens pilosa var. minor])

An introduced herb native to temperate and tropical America. Naturalized in Sri Lanka and occurs as two varieties.
var. pilosa - Without or usually with very small white ray flowers. Only known from Peradeniya-Kandy area. Flowering from November to March.
var. minor(Above pic) - Very common weed of roadsides, disturbed places, cultivated grounds, etc. in the montaze zone. Flowering occurs throughout the year.