Fasciation, Fasciated Scape
Abnormal development from a single growing point (meristem), most commonly resulting in a flattened, wider than normal stem (scape), often with more than the expected number of flowers. In appearance, fasciation may give the impression of multiple fused stems.
There are several proposed causes, including mechanical injury and pests or diseases, along with environmental factors. A plant that produces a fasciated stem will not usually do so again in the following growing season.