Abstract: A partition system having partition panels each of which is provided with one or a pair of outwardly directed connector grooves extending vertically from top to bottom of the panes at each end. Each groove is provided with a narrow open mouth and an enlarged interior. The narrow open mouth portion of each groove is oriented so that it is directed at an outward angle with respect to the end of the panel so that the pair of grooves are arranged in an essentially divergent manner. A connection member consisting of a continuous plastic extrusion is provided having a central web portion, and enlarged bulbous rib members extending down either end of the web, the rib members having a shape essentially the same as the cross-section of the connector grooves, and being adapted to be received within the grooves of two adjacent partition panels, whereby the panels may be joined together edge to edge, along either corner of an end of said panels.