A branch collar is the "shoulder" between the branch and trunk of woody plants; the inflammation formed at the base of the branch is caused by annually overlapping trunk tissue. The shape of the branch collar is due to two separate growth patterns: initially the branch grows basipetally, followed by seasonal trunk growth which envelops the branch.
A branch collar is the "shoulder" between the branch and trunk of woody plants; the inflammation formed at the base of the branch is caused by annually overlapping trunk tissue. The shape of the branch collar is due to two separate growth patterns: initially the branch grows basipetally, followed by seasonal trunk growth which envelops the branch.
Source: Wikipedia "Branch collar" · CC BY-SA 4.0
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