Grimes, Mimosoid legumes 
733 
/—s -- bract 
- leaf 
o 
— unit-inflorescence 
Fig. 1. A diagrammatic representation of the growth of Paraserianthes lophantha and Zapoteca 
tetragom. Hollow stems represent the last RGU (see text), solid stems the current RGU. In both 
species the RGU is made up of a series of sterile metamers followed by a series of fertile ones. 
The species exhibit late-suppressed hysteranthy, in which the leaves subtending the first-formed 
unit-inflorescences are developed, but those subtending the later ones are suppressed. 
