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Seedling morphology in taxonomic study of two common weeds – Ageratum conyzoides L. and A. houstonianum Mill. (Asteraceae)

In the present communication the details of seedling morphology in taxonomic study of two common Asteraceous weeds viz. Ageratum conyzoides L. and A. houstonianum Mill. from Varanasi District, Uttar Pradesh have been provided. Some juvenile characters of seedlings are found to be very useful in distinguishing the taxa studied and have been utilized for formulation of key at species level. RS values at different leaf stages, date of appearance of different leaves and total observation period were also recorded.