Mishnah Uktzin 1:3: The following can become impure, and can make other things impure but do not combine. The roots of garlic, onion and leek when they are dry and their stems at the place where there is no food against them, and the handle of a grape vine a fistful on either side, the handle of a cluster of grapes, in any amount and the tail of a cluster of grapes that became exposed [through the removal of grapes] and four fistfuls of the handle of the date palm, and the three fistfuls of an ear of grain and three fistfuls of all handles of things that are cut, and whatever is not usually cut, even a minute amount of their handles or roots, and the bristles of an ear of grain these things can become impure, and can make other things impure but do not combine.

אֵלּוּ מִטַּמְּאִין וּמְטַמְּאִין וְלֹא מִצְטָרְפִין. שָׁרְשֵׁי הַשּׁוּם וְהַבְּצָלִים וְהַקַּפְלוֹטוֹת בִּזְמַן שֶׁהֵם יְבֵשִׁים, וְהָעַמּוּד שֶׁאֵינוֹ מְכֻוָּן כְּנֶגֶד הָאֹכֶל, וְיַד הַפַּרְכִּיל טֶפַח מִכָּאן וְטֶפַח מִכָּאן, יַד הָאֶשְׁכּוֹל כָּל שֶׁהוּא, וְזָנָב שֶׁל אֶשְׁכּוֹל שֶׁרִקְּנוֹ, וְיַד הַמַּכְבֵּד שֶׁל תְּמָרָה אַרְבָּעָה טְפָחִים, וְקָנֶה שֶׁל שִׁבֹּלֶת שְׁלשָׁה טְפָחִים, וְיַד כָּל הַנִּקְצָרִים שְׁלשָׁה, וְשֶׁאֵין דַּרְכָּן לִקָּצֵר יְדֵיהֶם וְשָׁרְשֵׁיהֶם כָּל שֶׁהֵן, וּמַלְעִין שֶׁל שִׁבֳּלִין, הֲרֵי אֵלּוּ מִטַּמְּאִים וּמְטַמְּאִין וְלֹא מִצְטָרְפִין:

Mishnah Uktzin 1:4: The following neither defile nor can they be defiled nor do they join together: The roots of cabbage-stalks, Young shoots of beet growing out of the root, and [the same with] turnips, [And produce whose roots] that are normally cut off but were pulled up [with their roots]. Rabbi Yose declares them all susceptible to impurity, but he declares insusceptible to impurity cabbage-stalks and turnips.

אֵלּוּ לֹא מִטַּמְּאִין וְלֹא מְטַמְּאִין וְלֹא מִצְטָרְפִין. שָׁרְשֵׁי קוֹלְסֵי הַכְּרוּב, וְחֻלְפוֹת תְּרָדִים, וְהַלֶּפֶת, אֵת שֶׁדַּרְכָּם לִגָּזֵז וְנֶעֱקְרוּ. רַבִּי יוֹסֵי מְטַמֵּא בְכֻלָּן וּמְטַהֵר בְּשָׁרְשֵׁי קוֹלְסֵי הַכְּרוּב וְהַלָּפֶת: