Medieval Latin lavandula reached Middle English through Anglo-French. Earlier English lavendre gives way to the familiar lavender spelling.
These cards show three distinct spellings; the full route also includes an Anglo-French intermediary.
Sources
- Merriam-Webster: lavender
Noun Word History supports the selected route; definitions support the plant and color senses.
- Online Etymology Dictionary · lavender
Meanings of the older forms on the word path.
- logeion.uchicago.edu · lavandula
Meanings of the older forms on the word path.