Alternate

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1. the arrangement of leaves or buds one at a time along a stem at the nodes.

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A comparison of leaf attachments.
Source: http://hvp.osu.edu/hcs300/glossary/leafpart.htm#attach

alternate3.jpg

Alternate leaves on a stem.
Source: http://generalhorticulture.tamu.edu/h202/labs/lab2/leafm-links/alternate-leaf.html