20 Roubles Least Moonwort

The Least Moonwort (Botrychium simplex) is among the smallest and most elusive ferns in the Northern Hemisphere, easily overlooked in the field and consequently understudied for most of botanical history. Belarus included it in its ongoing silver conservation series as a species listed in the national Red Book — the country's official register of threatened flora and fauna, a Soviet-era institution still maintained by post-independence Belarusian authorities.