Related על סוכה 3:1

A palm-branch which is dried up, or whose top is broken, is not valid. A willow of a naturally watered field, or a mountain willow, is valid. If this is so, why is it said, "Willows of the brook?" [Leviticus 23] To exclude the tsaphtsaph.

If one does not have a citron, he must not take in his hand a quince, or any other fruit. Withered fruits are valid, but dried ones are not valid. Rabbi Yehudah, however, says that even dried-up ones are valid. And again he says: There is a story of the men of Carbin that they used to transmit their lulavs in the time of persecution. They said to him, The time of persecution is no proof.