Fantastic Adventures vol. 11, no. 9 (September 1949)
I like the kind of oblique/off-balance nature of this. They were focused on something in the foreground (something our hero had just shot?), looking out of the cover, until the plant-men interrupted them when they turned away from us. Also it looks rather friendly for an invasion.
Original magazine: https://archive.org/details/Fantastic_Adventures_v11n09_1949-09_unz.org
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