with stem nodes each containing 🍁︎ leaves or ⬮ leaf scars usually numbering/​arranged …

1-at-a-node,
arranged
╧╤╧╤
alternate
 (spiral)
  if unsure
2-at-a-node,
arranged
═╪═╪
opposite
 or
3+-at-a-node,
arranged
═❋═❋
whorled
:

2-at-a-node, arranged ═╪═╪ opposite

2-at-a-node,
arranged
═╪═╪
opposite
⊖ not-decussate
MAD-Cap-Horse
  2-at-a-node,
arranged
═╪═╪
opposite
⊕ decussate
Hydrangea  family Hydrangeaceae

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plant terminology