Shepherd's-purse, Capsella bursa-pastoris, inflorescence.

A single flower stem with many stalked flowers of pale pink growing mostly at the end of the stem. Leaves are also stalked and heart shaped. Copyright information is at the bottom (Copyright 2007 The Regents of the University of California. All rights reserved.). Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources
Credit: Joseph M. DiTomaso, UC Agriculture and Natural Resources