Well if the grow where they are supposed to then they are not weeds but once they take over fields then we start considering them as weeds. That can be one explanation the other can be. We take them for granted because they grow every where.
I have always been close to nature but even then my powers of observation seem lacking. I never gave a close look to the flowers before until now. Its not a obnoxious weed like Lantana or Paper mulberry, just something that has been ignored by some but not by traditional healers. For them it is a valuable herb.
I think I should pay a visit to the database of Tropicos.
Regards,
Arif.