354 titles (books/journals)
1,825 volumes
840,587 pages
165,705 links to protologues
Recent additions 
Botanicus is a freely accessible, Web-based encyclopedia of historic botanical literature from the Missouri Botanical Garden
Library. Botanicus is made possible through support from the W.M. Keck Foundation and the Andrew W. Mellon Foundation.
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- Mackenzie, D.
- Malpighi, Marcello,
- Marggraf, Georg,
- Marin, Otto Ulrik,
- Martius, Karl Friedrich Philipp von,
- Mary, Benj.
- Mascardi, Vitalis.
- Mason, Silas C.
- Mathiae Andreae Schmidt.
- Maubert
- Medén, Jonas Fredrik,
- Meerburgh, Jacobum.
- Meerburgh, Nicolaas,
- Mellerborg, Claus Erik.
- Merrill, Elmer Drew,
- Meyer, Ernst Heinrich Friedrich,
- Michaux, AndreÌ,
- Miers, John,
- Miller, J.
- Miller, Philip,
- Miquel, Friedrich Anton Wilhelm,
- Missouri Botanical Garden.
- Modin, Bengt Theodor,
- Moench, Conrad,
- Mohl, Hugo von,
- Moninckx, Johan.
- Moninckx, Maria.
- Montagne, Jean François Camille,
- Moore, Thomas,
- Müller, Karl,
- Mulgrave, Constantine John Phipps,
- Müller, Ferdinand Jacob Heinrich von,
- Müller, Karl
- Munniks, Johannes,
- Muquardt, C.
- Murray, Johan Anders,