A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses centrifugally, with the oldest elements (protoxylem) towards the center of the plant axis (PO:0025004).
Source:
POC:Laurel_Cooper,
ISBN:0471245208
Comment
Endarch protoxylem is typically found in stems of seed plants, and also in leaves in which the protoxylem is on the adaxial side.
Subset
None
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