| udaberri |
| udaberri, bedatse, udalehen +biz, primadera +ipar  | (ize) | [astronomia] | primavera | | udaberriko ekinokzio | (ize) | [geografia] | equinoccio de primavera | | udaberriko elur | (ize) | [meteorologia] | nieve primavera | | udaberri-lore (Primula veris) | (ize) | [flora] [landare] [sendabelar] | Primula veris | | udaberriko adonis (Adonis vernalis) | (ize) | [flora] [landare] [sendabelar] | adonis de primavera, ojo de perdiz | | perretxiko, udaberriko zizazuri, uson, ziza (Tricholoma georgii, Calocybe gambosa) | (ize) | [flora] [mikologia] | seta de carretilla, seta de San Jorge, seta de primavera, lansarón, perrechico |
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| udaberri-lore |
| udaberri-lore (Primula veris) | (ize) | [flora] [landare] [sendabelar] | Primula veris |
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| udaberriko adonis |
| udaberriko adonis (Adonis vernalis) | (ize) | [flora] [landare] [sendabelar] | adonis de primavera, ojo de perdiz |
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| urki |
| urki dilindari, urki zilarkara (Betula pendula, Betula verrucosa) | (ize) | [flora] [sendabelar] | abedul común, abedul de plata, abedul de Europa, abedul verrugoso, abedul péndulo | | urki nano (Betula nana) | (ize) | [flora] [zuhaitzak] | abedul enano | | urki zuri, urki zuri europar, urki iledun, urki iletsu (Betula alba, Betula pubescens, Betula Celtiberica) | (ize) | [flora] [zuhaitzak] | abedul blanco, abedul pubescente | | urkidi | (ize) | [flora] [geografia] | bosque de abedules, abedular | | urki-onddo (Leccinum scabrum) | (ize) | [flora] [mikologia] | boleto de pie escabroso | | urki-ardagai (Piptoporus betulinus) | (ize) | [flora] [mikologia] | yesquero de abedul | | urki (Betula sp.) | (ize) | [flora] [zuhaitzak] | abedul | | urki garatxo beltz (Hypoxylon multiforme) | (ize) | [flora] [mikologia] | Hypoxylon multiforme |
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| urkitz |
| urkitz (Jasminum officinale) | (ize) | [flora] [landare] [sendabelar] | Jasminum officinale |
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| urrilo |
| mandragora, urrilo (Mandragora officinarum) | (ize) | [flora] [landare] [sendabelar] | mandrágora |
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| urtsubelar |
| lapatina, urtsubelar, usu-belar (Agrimonia eupatoria) | (ize) | [flora] [landare] [sendabelar] | agrimonia, hierba de San Guillermo |
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| usu-belar |
| lapatina, urtsubelar, usu-belar (Agrimonia eupatoria) | (ize) | [flora] [landare] [sendabelar] | agrimonia, hierba de San Guillermo |
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| uztao |
| lapaitz (Rumex obtusifolius) | (ize) | [flora] [zuhaitzak] | acedera, romaza | | lapaitz, mingarratz handi, uztaro handi, gazi-belar, gazi belar, matxingarratz +biz, mingarratz, mingotx +ipar +naf (Rumex acetosa) | (ize) | [flora] [landare] [sendabelar] | acedera común, vinagrera | | uztaro, ziorlatz (Rumex crispus) | (ize) | [flora] [zuhaitzak] | acedera, romaza | | ahago (Rumex patientia) | (ize) | [flora] [landare] [sendabelar] | acederón | | uztaro (Rumex acetosella) | (ize) | [flora] [landare] [sendabelar] | acederilla, acetosilla | | uztao, uztaro (Rumex sp.) | (ize) | [flora] [landare] | acedera |
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| uztaro |
| lapaitz (Rumex obtusifolius) | (ize) | [flora] [zuhaitzak] | acedera, romaza | | lapaitz, mingarratz handi, uztaro handi, gazi-belar, gazi belar, matxingarratz +biz, mingarratz, mingotx +ipar +naf (Rumex acetosa) | (ize) | [flora] [landare] [sendabelar] | acedera común, vinagrera | | uztaro, ziorlatz (Rumex crispus) | (ize) | [flora] [zuhaitzak] | acedera, romaza | | ahago (Rumex patientia) | (ize) | [flora] [landare] [sendabelar] | acederón | | uztaro (Rumex acetosella) | (ize) | [flora] [landare] [sendabelar] | acederilla, acetosilla | | uztao, uztaro (Rumex sp.) | (ize) | [flora] [landare] | acedera |
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