a pattern of tree branching characterized by a central leader and a pyramidal. cone-shaped crown (contrast with decurrent).

Merriam-Webster Online Dictionary
excurrent (adjective)
1.
characterized by a current that flows outward - the clam's excurrent siphon
2.
having the axis prolonged to form an undivided main stem or trunk (as in conifers) - compare deliquescent 2
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