"Flora von Deutschland" by O. Schmeil and Jost Fitschen is a botanical field guide first published in 1904. This comprehensive work helps identify higher plants—vascular spore plants and seed plants—throughout German-speaking regions and surrounding areas. The authors aimed to highlight the most easily recognizable distinguishing features, making plant identification accessible even for beginners. With over 2.5 million copies sold and continuous updates by successive editors, it has become an essential botanical reference work spanning multiple countries.
Wikipedia page about this book: de.wikipedia.org/wiki/Die_Flora_Deutschlands_und_angrenzender_L%C3%A4nder