Seseli diffusum

Seseli diffusum (Roxb. ex Sm.) Santapau & Wagh (syn: Athamanta diffusa (Roxb.) Wall.; Cnidium diffusum DC.; Ligusticum diffusum Roxb. ex Sm.; Ligusticum indicum Wall.; Meum diffusum Baill.; Seseli indicum Wall. ex Wight & Arn.); 

India (Plains of India), S-Nepal, Pakistan (I), Myanmar [Burma] as per Catalogue of Life;

Images by Surajit Koley (Inserted by J.M.Garg) (For more images & complete details, click on the links)
Hooghly : Oenanthe (Seseli)? : Attachments (4). 5 posts by 2 authors.
Found this small prostrate-erect herb/weed in a low lying cultivated land (often remains unused), on 03-April-2013.
I think this species is Seseli indicum Wight & Arn.
The Bengali name - BON JOWAN (বন জোয়ান)
Similar looking other species in Bengal Plants -