In this paper, the authors deal with the morphological features of 10 abnormal branches of honeysuckle. The studied forms are of two different types. The first is illustrated by five specimens collected on a single hybrid bush called Lonicera nigra × orientalis. All of these show unusual union between restricted portions of different leaves. The arrangement of the fused parts permits one to infer that gamophylly, in this example, results indubitably from a real ontogenetic (postgenital) union. Concaulescence is the second kind of anomaly, shown in the samples from various cultivars belonging to the Lonicera tatarica complex. The occasional occurrence of accessory serial buds between the concrescent axes suggests that ontogenetic fusion could give rise also to such structures. In some particular instances, however, it is possible that unusual intercalary growth is combined with the first process.
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Vieth et al. (1973) studied this question.