The Rambam · Sefer Zemanim
הלכות שופר וסוכה ולולב ז׳Shofar, Sukkah and Lulav 7
Chapter 7 of 8 in Shofar, Sukkah and Lulav — 27 halachot
Halacha 1א׳
(ויקרא כג מ) "כַּפּוֹת תְּמָרִים" הָאֲמוּרוֹת בַּתּוֹרָה הֵן חֲרָיוֹת שֶׁל דֶּקֶל כְּשֶׁיִּצְמְחוּ קֹדֶם שֶׁיִּתְפָּרְדוּ הֶעָלִין שֶׁלָּהֶן לְכָאן וּלְכָאן אֶלָּא כְּשֶׁיִּהְיֶה כְּמוֹ שַׁרְבִיט. וְהוּא הַנִּקְרָא לוּלָב:
The "boughs of palm trees" (Leviticus 23:40) that are spoken of in the Torah are the fronds of the palm tree when they sprout, before their leaves separate to this side and to that, while it is still like a rod. And this is what is called a lulav.
Halacha 2ב׳
(ויקרא כג מ) "פְּרִי עֵץ הָדָר" הָאָמוּר בַּתּוֹרָה הוּא אֶתְרוֹג. (ויקרא כג מ) "וַעֲנַף עֵץ עָבוֹת" הָאָמוּר בַּתּוֹרָה הוּא הַהֲדַס שֶׁעָלָיו חוֹפִין אֶת עֵצוֹ. כְּגוֹן שֶׁיִּהְיוּ שְׁלֹשָׁה עָלִין אוֹ יֶתֶר עַל כֵּן בְּגִבְעוֹל אֶחָד. אֲבָל אִם הָיוּ שְׁנֵי הֶעָלִין בְּשָׁוֶה זֶה כְּנֶגֶד זֶה וְהֶעָלֶה הַשְּׁלִישִׁי לְמַעְלָה מֵהֶן אֵין זֶה עָבוֹת אֲבָל נִקְרָא הֲדַס שׁוֹטֶה:
The fruit of goodly trees specified in the Torah is the ethrog. The boughs of leafy trees specified in the Torah refer to the myrtle, the leaves of which cover the wood; it has, for example, three or more leaves growing from each bud. However if two leaves were one across from the other, but the third leaf was above them, this is not [considered] "leafy." Rather it is called a fool's myrtle
Halacha 3ג׳
(ויקרא כג מ) "עַרְבֵי נַחַל" הָאֲמוּרוֹת בַּתּוֹרָה אֵינָן כָּל דָּבָר הַגָּדֵל עַל הַנַּחַל אֶלָּא מִין יָדוּעַ הוּא הַנִּקְרָא עַרְבֵי נַחַל. עָלֶה שֶׁלּוֹ מָשׁוּךְ כְּנַחַל וּפִיו חָלָק וְקָנֶה שֶׁלּוֹ אָדֹם וְזֶה הוּא הַנִּקְרָא עֲרָבָה. וְרֹב מִין זֶה גָּדֵל עַל הַנְּחָלִים לְכָךְ נֶאֱמַר עַרְבֵי נָחַל. וַאֲפִלּוּ הָיָה גָּדֵל בַּמִּדְבָּר אוֹ בֶּהָרִים כָּשֵׁר:
The "willows of the brook" (Leviticus 23:40) that are spoken of in the Torah are not everything that grows by a brook; rather it is a known species that is called the willow of the brook. Its leaf is drawn out long like a brook, and its edge is smooth, and its stem is red — and this is what is called a willow. And most of this species grows by the brooks, and therefore it is said, "willows of the brook"; but even if it grew in the wilderness or in the mountains, it is fit.
Mishneh Torah, Torat Emet 363 edition, via Sefaria — public domain
English: Sefaria Edition, tr. R. Francis Nataf, 2019 — CC BY
English: rendered from the Hebrew for this app — our own, not a borrowed translation