A raceme (/reɪˈsiːm/ or /rəˈsiːm/) is an unbranched, indeterminate type of inflorescence bearing pedicellate flowers — flowers having short floral stalks called pedicels — along its axis. In botany, axis means a shoot, in this case one bearing the flowers.xamples of racemes occur on mustard (genus Brassica) and radish (genus Raphanus) plants. A spike is an unbranched, indeterminate inflorescence, similar to a raceme, but bearing sessile flowers (sessile flowers are attached directly, without stalks).