Related for Sukkah 64:3
לולב שיש בו שלשה טפחים: אמר רב יהודה אמר שמואל שיעור הדס וערבה שלשה ולולב ארבעה כדי שיהא לולב יוצא מן ההדס טפח
A lulav which is three handbreadths in length. Rab Judah said in the name of Samuel: The [minimum] length of the hadas and the aravah is three [handbreadths], and that of the lulav four, so that the lulav should extend one handbreadth beyond the hadas.
Tosefta Sukkah
What is the tsaphtsaph? It has leaves serrated like a saw, and such a willow is not valid ; its stem is white and its leaf rounded. A myrtle and a willow which have been lopped, and palms coming out between them, are valid. The size of a myrtle and a willow must be three handbreadths, that of a palm-branch four. Rabbi Tarphon says: In a cubit there are five handbreadths. As for these four kinds of plants, just as nothing must be taken away from them so must nothing be added to them.
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