Clustered broomrape is an erect forb, 5-15cm tall, with loose, flat-topped corymbs that surpass the stem, bractlets are absent, corolla are 1.5-3cm, calyx lobes are about equal to the tube. Leaves are reduced to scales, ovate, hairy, all or at least the upper ones with an abrupt, sharp point.
Its 4-10 pedicels, slightly, if at all, longer than the stem distinguish it from similar species.