Import the object into Blender.

With the mouse in the 3D viewport press Numpad1 then Numpad . (decimal)

RMB the rose and press TAB

Press CTRL>N

click OKAY

press the A key

Goto the links and materials pane

Under the materials section cycle through the choices until you have petals current ( 6 mat 3)

Press select to select only the petals

press W>0 (numpad or keyboard)

hover cursor at top edge of 3d window when the cursor turns into a bi-directional arrow RMB and choose split

set one of the windows to UV Editor by selecting it from the drop down list at the lower left corner of the window

place cursor in 3D viewport and press the A key  all the verts should now be yellow

press U>1

in the UV Editor panel select UVs>scripts> save UV face layout follow the prompts

export the normal corrected UV mapped object