Identifying the species meant in the verse: Succah 32a
A thorny species can't be what was intended, because the ways of the Torah are pleasant: Succah 32a
Requiring that the Lulav be 4 Hand-Breadths long; 3, plus 1 for shaking it: Succah 29b, 32b, 37b; Menachot 41b-42a
A maximum size for the Lulav: Menachot 41b-42a
A dried-out Lulav: Succah 29b, 30a, 31a
A Lulav which had the top sliced off: Succah 29b, 31b
A Lulav in which the leaves separated [to various degrees]: Succah 29b, 32a
A species of Lulav termed "Tzinei Har HaBarzel," which has sparse leaves: Succah 29b, 32a-b
A Lulav where the top cracked: Succah 31b-32a
A Lulav where the top is bowed over: Succah 31b-32a
A Lulav with thorny protrusions: Succah 32a
A cracked, curved, hardened Lulav: Succah 32a
A Lulav with two "spines": Succah 32a
A Lulav on which all of the leaves extend from one side of the spine: Succah 32a
A Lulav where the uppermost leaf-joint ["Teyomet"] was removed/split: Succah 32a