A mowing device for the treatment of vegetations, adapted for the attachment to a carrier and for the connection to a drive unit, said mowing device includes a frame, on which mowing spindles (7a, 7b) are mounted, which are provided on one side with mowing blades and on the opposite side with distributing elements for the connection to transmission members, wherein on the frame a transmission mechanism for driving the mowing spindles (7a, 7b) is further positioned, wherein - the mowing spindles (7a, 7b) are arranged in two mutually parallel rows, defined by longitudinal lines (8, 9), located in a mutual distance separation, - the mowing spindles (7a, 7b) of each row are interconnected by means of the transmission members, - the centres of the mowing spindles of the first row on a line are located in a mutual spacing, - the centres of the mowing spindles of the second row on the line are located in the mutual spacing, - the centres of the mowing spindles of the second row are offset in the direction of the lines (8, 9) by a one-half (P/2) of the spacing with respect to the centres of the mowing spindles of the first row on the line, - a connecting line of the centre of each mowing spindle of the first row on the line with the centre of the immediately adjacent mowing spindle of the second row on the line forms with parallel longitudinal lines (8, 9) an acute angle (α), for which the following applies: tg α = − − − − P / 2 L, - the size of the angle (α) is in the range from 15° to 60°, characterized in that - the transmission mechanism for driving the mowing spindles (7a, 7b) comprises two transmission devices mounted side by side on the frame and mutually connected, - the first transmission device is arranged for the rotation in one rotational direction, and it is connected via transmission members with the mowing spindles of the first row on the line, - the second transmission device is arranged as a reverse device for an optional rotation of the output shaft of the gearbox with both rotational directions, and it is associated via transmission members with the mowing spindles of the second row on the line. - the mowing spindles (7a, 7b) are arranged in two mutually parallel rows, defined by longitudinal lines (8, 9), located in a mutual distance separation, - the mowing spindles (7a, 7b) of each row are interconnected by means of the transmission members, - the centres of the mowing spindles of the first row on a line are located in a mutual spacing, - the centres of the mowing spindles of the second row on the line are located in the mutual spacing, - the centres of the mowing spindles of the second row are offset in the direction of the lines (8, 9) by a one-half (P/2) of the spacing with respect to the centres of the mowing spindles of the first row on the line, - a connecting line of the centre of each mowing spindle of the first row on the line with the centre of the immediately adjacent mowing spindle of the second row on the line forms with parallel longitudinal lines (8, 9) an acute angle (α), for which the following applies: tg α = − − − − P / 2 L, - the size of the angle (α) is in the range from 15° to 60°, - the transmission mechanism for driving the mowing spindles (7a, 7b) comprises two transmission devices mounted side by side on the frame and mutually connected, - the first transmission device is arranged for the rotation in one rotational direction, and - the second transmission device is arranged as a reverse device for an optional rotation of the output shaft of the gearbox with both rotational directions, and it is associated via transmission members with the mowing spindles of the second row on the line.