Descriptor : number of wide metaxylem element per fibrous vascular bundle
Descriptor type : categorical
Must be described on developed fvb (not on the fvb near the apex).
- mostly 1
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- mostly 2 (3-4)
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- mostly 3-4
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- more than 4
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- 1 in the the subcortical zone and the zone of transition AND 2 in the central zone
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