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The current cosmological paradigm sees the formation and evolution of thecosmic large-scale structure as governed by the gravitational attraction of theDark Matter (DM) and the repulsion of the Dark Energy (DE).  We characterize the relative importance of uniform and constant dark energy,as given by the Lambda term in the standard LCDM cosmology, in galaxy systemsof different scales, from groups to superclusters.  An instructive "Lambda significance graph" is introduced where the matter-DEdensity ratio <rho_M>/rho_Lambda for different galaxy systems is plottedagainst the radius R. This presents gravitation and DE dominated regions andshows directly the zero velocity radius, the zero-gravity radius, and theEinstein-Straus radius for any fixed value of mass.  Example galaxy groups and clusters from the local universe illustrate the useof the Lambda significance graph. These are generally located deep in thegravity-dominated region <rho_M}>/rho_Lambda > 2, being virialized. Extendedclusters and main bodies of superclusters can reach down near the border linebetween gravity-dominated and DE dominated regions <rho_M>/rho_Lambda = 2. Thescale--mass relation from the standard 2-point correlation function intersectsthis balance line near the correlation lenght.  The log <rho_M>/rho_Lambda vs. log R diagram is a useful and versatile way tocharacterize the dynamical state of systems of galaxies within the Lambdadominated expanding universe.

A graph of dark energy significance on different spatial and mass scales