I am the tree, Fatimah is its branch and Ali is its pollen

It is narrated from Sayyiduna Abdullah bin Abbas (may Allah be pleased with them both) that the Messenger of Allah (peace and blessings be upon him) drew four lines on the ground and then asked: "Do you know what this is?" The Companions said: Allah and His Messenger know best. The Messenger of Allah (peace and blessings be upon him) said: "The best of the women of the people of Paradise are Khadijah bint Khuwaylid and Fatimah bint Muhammad (may Allah be pleased with them both)."
This hadith has a sahih (authentic) chain of narration, but the two Shaykhs (Bukhari and Muslim) did not record it.

It is narrated from Mina' bin Abi Mina', the freed slave of Abd al-Rahman bin Awf, that he said: Take (knowledge) from me before falsehoods are mixed into the hadiths. I heard the Messenger of Allah (peace and blessings be upon him) say: "I am the tree, Fatimah is its branch, Ali is its pollen (the fertilizing matter of its blossoms), Hasan and Husayn are its fruit, and the people of our party are its leaves. The root of the tree is in the Garden of Eden, and the rest of it is spread throughout the whole of Paradise."
This text is shadhdh (anomalous); yet despite that, Ishaq al-Dabari is truthful (saduq), Abd al-Razzaq, his father and his grandfather are trustworthy (thiqah), and Mina' lived in the time of the Prophet (peace and blessings be upon him) and heard from him. And Allah knows best.

It is narrated from the Mother of the Believers, Sayyidah Aishah (may Allah be pleased with her), that whenever she mentioned Sayyidah Fatimah (may Allah be pleased with her), the daughter of the Prophet (peace and blessings be upon him), she would say: I have not seen anyone more truthful in speech than her (Fatimah, may Allah be pleased with her), except her father (peace and blessings be upon him), who begot her.
This hadith is sahih (authentic) on the condition of Imam Muslim, but the two Shaykhs did not record it.