Calyx conspicuously 8-veined, 2-lipped, upper lip more elongated, with 2 robust teeth, lower lip 3-toothed, with middle tooth larger than lateral teeth.

• 显著的花萼8脉，二唇形，上唇更多拉长，具2粗壮的齿，下唇具3齿，具中间比侧的齿大的齿。