Heinrich Gustav Flörke (24 December 1764, in Altenkalden in Mecklenburg – 11 June 1835) was a German botanist and lichenologist. The standard author abbreviation Flörke is used to indicate this person as the author when citing a botanical name.^[1]

He initially studied theology and mathematics in Bützow, later studying medicine at the University of Jena. In 1816 he succeeded Ludolph Christian Treviranus (1779–1864) as professor of natural history at the University of Rostock, where he remained for the rest of his life.

He specialized in the field of lichenology, being known for his investigations of the genus Cladonia. During his career, he was highly critical of Swedish botanist Erik Acharius's work; e.g. Kritische Anmerkungen zu den Becherflechten in der Lichenographia universalis des Herrn Doctors und Ritters Erik Acharius (1810) - (Critical comments on the cup lichen in Lichenographia universalis of Erik Acharius).^[2]

For a number of years Flörke was an editor of "Oekonomische Encyklopädie", an encyclopedia initiated by Johann Georg Krünitz (1728–1796).^[3] He issued the exsiccatae Deutsche Lichenen, gesammelt und mit Anmerkungen herausgegeben von H. G. F.^[4] and Cladoniarum exemplaria exsiccata, commentationem novam illustrantia.^[5] His name is associated with the wildflower genus Floerkea, and also the lichen species Cladonia floerkeana.^[6]

• Beschreibung der deutschen staubflechten, 1807^[7]
• Deutsche Lichenen gesammelt und mit Ammerkungen, 1815^[8]
• De Cladoniis : difficillimo lichenum genere, commentatio nova, 1828.^[9]

• Category:Taxa named by Heinrich Gustav Flörke