Phyllotaxy
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The arrangement of leaves on a stem — spiral (alternate), opposite, whorled or two-ranked. Phyllotaxy is often constant within a genus or family and is one of the first characters used to key out an unknown plant.
The arrangement of leaves on a stem — spiral (alternate), opposite, whorled or two-ranked. Phyllotaxy is often constant within a genus or family and is one of the first characters used to key out an unknown plant.