Rashi on Leviticus 23:40/רש"י על ויקרא כ״ג:מ׳

1פרי עץ הדר THE FRUIT OF THE TREE HADAR — a tree the wood of which (עץ) has the same taste as its fruit (פרי) (Sifra, Emor, Chapter 16 4; Sukkah 35a).

2הדר — It is called הדר because it is the tree whose fruit remains (הַדָּר) on the tree from one year to another (several years) — and this is the “Ethrog”.

3כפת תמרים A BRANCH OF PALM TREES — The word כפת is written defective (without ו, not כפות) to intimate that only one branch is intended (Sukkah 32a).

4וענף עץ עבת AND BOUGHS OF THE TREE עבת — i. e. of a tree whose boughs are, as it were, plaited (intertwined one with another) like ropes (עבתות) and cords; this is the myrtle plant which is indeed formed as a plait (three leaves issuing from one point of the branch and covering it) (Sukkah 32b).