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1. There is a dispute about whether one may use the Higi bush as Sechach.
2. The Gemara discusses using palm branches as Sechach.
3. Rav Chisda: Swamp Maror may be used for the Mitzvah of Maror on Pesach.
4. Abaye gives a general rule for when a specific item is considered part of a general species in Torah law.
5. The Gemara teaches an exception to the rule that bundles of Sechach may not be used.
A BIT MORE
1. Rav Chanan bar Rava: It may be used. Abaye: It may not be used. Since its branches commonly fall down, they may cause a person to leave the Sukah because of the discomfort.
2. The Gemara says that the lower part of the palm branch -- from which many pieces jut out in many places -- is not considered a bundle since it is bundled up naturally. The pieces higher up -- which spread apart and one ties them together to make them fit neatly in one place -- is not called a bundle, because only when many pieces of an item are tied together is it considered a bundle (but not when the separate branches of one item are bundled together at the top).
3. Although the Torah says that one should eat "Maror" and not "swamp Maror," "swamp Maror" constitutes Maror and one fulfills the Mitzvah of Maror with it.
4. If the item had a modifier (for example, "swamp" Maror) before the Torah was given and the Torah does not mention its modifier, it cannot be included in what the Torah mentions. However, if the item did not have this extra modifier before the Torah was given, then it is included in the item mentioned by the Torah.
5. There were certain reeds (Isuryasa d'Sura) that were bundled only when being moved, and once they were bought they were immediately opened and spread out so that they could dry. There is no concern that these would stay bundled and provide shade, and therefore they are permitted as Sechach when bundled (and Gezeiras Otzar does not apply).
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