1951 年 64 巻 753-754 号 p. 93-98
There are remarkable dissimillarities of plant habits between the plants with small numbers of chromosomes and those with large numbers. In herbaceous plants, those with small numbers of chromosomes have short life (annual habit), while those with large numbers have long life (perennial habit). These two groups of plants differ from each other in fertility, activity, adaptability and hybridity. There are gradual dominance of vegetative propagations (by rhizome, tuber, bulb, bulbil, or runner) over seed propagation, in diploid than polyploid plants.
Diploid plants propagate by seed, while polyploid ones become less fertile and npropagate vegetatively, forming special life forms.
Diploid plants seem to have much wide distribution by seed in most favourably warm and humid areas, while distribution of polyploid plants is limitted, propagating more vegetatively in less favourable areas.