Disclosed are compounds of Formula 1, including all stereoisomers, N-oxides, and salts thereof, wherein X1, X2, X3, G and Q are as defined in the Summary of the Invention; P is P1 or P2; and P1 and P2 are as defined in the Summary of the Invention. Also disclosed are compositions containing the compounds of Formula 1 and methods for controlling undesired vegetation comprising contacting the undesired vegetation or its environment with an effective amount of a compound or a composition of the invention. Also disclosed is a herbicidal mixture comprising (a) a compound of Formula 1, and (b) at least one additional active ingredient selected from (b1) through (b16); and salts of compounds of (b1) through (b16), wherein (b1) through (b16) are as defined in the disclosure.