Grimes, Mimosoid legumes 
735 
Lysiloma microphyllum Bentham (Figs 3d, 4, 5a-d) 
Lysiloma microphyllum is widespread in Mexico from the Cordillera Occidental of Sonora 
south to Oaxaca, east into San Luis Potosi and Puebla. Observations were made on 
one mature (reproductive) and one juvenile plant in the conservatory of the New York 
Botanical Garden. Morphology of the stems, and growth and flowering are quite 
complicated and more long-term obser\'ations on wild populations are needed. 
c d 
Fig. 3. Scanning electron micrograph of three species of Ingeae. a, developing unit-inflorescence 
of Paraseriamhes lophantlm (x 100). The bract to the right is part os the same bud forming the 
unit-inflorescence; b, stem-apex of Zapoteca tetragom (x 200); c, axillary bud of Z. tetrngoim seven 
plastochrons after initiation of associated leaf-primordium (x 75); d, stem-apex of Lysiloma 
microphyllum (x 200). In this and subsequent micrographs b = bract, s = stipule p = leaf-primordium. 
