CHAPTER III.

HETEROTAXY 156

Formation of adventitious roots, 156--Of shoots below the cotyledons, 161--Adventitious leaves, 162--On scapes, 163--Production of leaves or scales in place of flower-buds, 164--Viviparous plants, 168--Formation of buds on leaves, 170--In pith, 171--On bulbs, 172--Production of gemmae in place of spores, 173--Of flowers on leaves, 174--Of flower-buds in place of leaf-buds, 176--Of flowers on spines, 177--Of flower-buds on petals, 177--On fruits, 178--In ovaries, 180--Of stamens in ovaries, 182--Of pollen in ovules, 185--Homomorphic flowers of Compositae, 188--Heterotaxy affecting the inflorescence, 188--Supra-soriferous ferns, 190.