The Collaborative International Dictionary of English v.0.48:

Cincinnus \Cin*cin"nus\, n.; pl. -ni. [Also cicinus,
   cicinnus.] [L., a curl of hair.] (Bot.)
   A form of monochasium in which the lateral branches arise
   alternately on opposite sides of the false axis; -- called
   also scorpioid cyme. -- Cin*cin"nal, a.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

scorpioid cyme
    n 1: a cyme with flowers or branches alternating in opposite
         ranks