Rif Succah 14b {Succah 29b continues; 31b}

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14b

{Succah 29b, Mishna, continues}
If its leaves were {merely} spread out, it is valid.
Rabbi Yehuda says: he should bind them above {so that they are not spread out}.

Palm branches that grow on the Iron Mountain {rocky mountains - these lulavim have very short leaves because of the lack of moisture} which possess three handbreadths which which to shake are valid.

{Succah 31b}
Gemara:
"if its head {point} was broken off":
Rav Huna cited Rabbi Chanina: They only learnt this regarding the case