Contributed by Margaret McCann / En masse in Hirschl & Adler’s brimming rooms, Julie Heffernan’s colorful, busy paintings overwhelm like a pride of peacocks. Her solo show “The Swamps are Pink with June,” a line from an Emily Dickinson poem, evokes the hope nature can inspire. This plays out in iconography, a saturated palette, and the adoption of tree diagrams as compositional trellises, which poise the accretion of experience against spontaneous flowerings from the unconscious.