| Preview | Czech name | Latin name | English name | Slovak name | German name | Bayer Code (EWRS) | Family | Family (Latin) |
 | Ambrózie pelyňkolistá (see Ambrozie peřenolistá) | Ambrosia artemisiifolia L. | Common ragweed | Ambrózia palinolistá | Beifuß-Ambrosie | AMBEL | Aster Family | Asteraceae |
| Ambrozie peřenolistá | Ambrosia artemisiifolia L. | Common ragweed | Ambrózia palinolistá | Beifuß-Ambrosie | AMBEL | Aster Family | Asteraceae |
 | Barborka obecná | Barbarea vulgaris R. BR. | Winter-cress | Barborka obyčajná | Echte Winterkresse | BARVU | Cabbage Family | Brassicaceae |
 | Bažanka roční | Mercurialis annua L. | Annual mercury | Bažanka ročná | Einjähriges Bingelkraut | MERAN | Spurge family | Euphorbiaceae |
 | Bělotrn kulatohlavý | Echinops sphaerocephalus L. | Pale globe-thistle | Ježibaba guľatohlavá | Große Kugeldistel | ECPSP | Aster Family | Asteraceae |
 | Bér přeslenitý | Setaria verticillata (L.) P.B. | Rough bristle-grass | Mohár praslenatý | Kletten-Borstenhirse | SETVE | Grass family | Poaceae |
 | Bér sivý | Setaria pumila (POIRET) R. et SCH. | Yellow bristle-grass | Mohár sivý | Fuchsrote Borstenhirse | SETPU | Grass family | Poaceae |
 | Bér zelený | Setaria viridis (L.) P.B. | Green bristle-grass | Mohár zelený | Grüne Borstenhirse | SETVI | Grass family | Poaceae |
 | Blín černý | Hyoscyamus niger L. | Common henbane | Blen čierny | Schwarzes Bilsenkraut | HSYNI | Potato Family | Solanaceae |
 | Bodlák obecný | Carduus acanthoides L. | Plumeless thistle | Bodliak trnistý | Stachel-Distel | CRUAC | Aster Family | Asteraceae |
 | Bolehlav plamatý | Conium maculatum L. | Poison hemlock | Bolehlav škvrnitý | Gefleckter Schierling | COIMA | Celery Family | Apiaceae |
 | Bračka rolní | Sherardia arvensis L. | Field madder | Drapuľa roľná | Ackerröte | SHRAR | Madder Family | Rubiaceae |
 | Bršlice kozí noha | Aegopodium podagraria L. | Ground-elder | Kozonoha hostcová | Giersch | AEOPO | Celery Family | Apiaceae |
 | Bytel metlatý | Kochia scoparia (L.) SCHRADER | Mock cypress | Kochia metlovitá | Besen-Radmelde | KCHSC | Goosefoot Family | Chenopodiaceae |
 | Čistec bahenní | Stachys palustris L. | Marsh woundwort | Čistec močiarny | Sumpf-Ziest | STAPA | Mint Family | Lamiaceae |