Fasciate

Fasciated Much flattened or cockscomb-like growth; seemingly several units fused together.
Fascicled Clustered.
Fastigiate With upright branches; having a narrowly columnar or pillar-like growth form.

fasciate
Banded or compacted together. A good example is the stems of one of my favorite pussy willows, Salix sachalinensis 'Sekka'. It looks like several stems are growing together.
fallow ...

When a shoot becomes enlarged and flattened, giving the appearance of several shoots fused together, caused by an abnormality. Often seen on forsythia. The cock's comb ornamental flower is grown specifically for its unusual fasciated flowerheads, ...

See also: Plant, Cluster, Graft, Division, Soil