Cytology has greatly influenced systematic botany and has suggested a new direction for research in phylogenetic relationships. Additional evidece based on microscopical studies confirms conclusions reached through gross morphological characters. Application of these new approaches has provided for a better understanding of certain taxa and offers keys to clarification of the interrelationships among the groups concerned. This part of systematics is based on the living plant. It is a means of relating the field to the vast numbers of herbarium sheets deposited in the ordinary herbarium. The object of the present series is to fill gaps in the chromosome counts of species occurring in temperate countries by similar studies on individuals destributed in the subtropics and tropics. |
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