on the title page as "" ('with the participation of'). From 1919 onwards, she was credited as the second author. F. Pax with the participation of Käthe Hoffmann (1911). "IV. 147. III Euphorbiaceae–Cluytieae". Heft (issue) 47. F. Pax with the participation of Käthe Hoffmann (1912). "IV. 147. IV Euphorbiaceae-Gelonieae". Heft 52. F. Pax with the participation of Käthe Hoffmann (1912). "IV. 147. V Euphorbiaceae-Hippomaneae". Heft 52. F. Pax with the participation of Käthe Hoffmann (1912). "IV. 147. VI Euphorbiaceae-Acalypheae-Chrozophorinae". Heft 57. F. Pax with the participation of Käthe Hoffmann (1914). "IV. 147. VII Euphorbiaceaee-Acalypheae-Mercurialinae". Heft 63. F. Pax & Käthe Hoffman (1919). "IV. 147. IX Euphorbiaceae-Acalypheae-Plukenetiinae". Heft 68. F. Pax & Käthe Hoffman (1919). "IV. 147. X Euphorbiaceae-Acalypheae-Epiprininae". Heft 68. F. Pax & Käthe Hoffman (1919). "IV. 147. XI Euphorbiaceae-Acalypheae-Ricininae". Heft 68. F. Pax & Käthe Hoffman (1919). "IV. 147. XII Euphorbiaceae-Dalechampieae". Heft 68. F. Pax & Käthe Hoffman (1919). "IV. 147. XIII Euphorbiaceae-Pereae". Heft 68. F. Pax & Käthe Hoffman (1919). "IV. 147. XIV Euphorbiaceae-Aditamentum IV". Heft 68. F. Pax & Käthe Hoffman (1922). "IV. 147. XV Euphorbiaceae-Phyllanthoideae-Phyllantheae". Heft 81. F. Pax & Käthe Hoffman (1924). "IV. 147. XVI Euphorbiaceae-Crotonoideae-Acalypheae-Acalyphinae". Heft 85. Author abbreviation References Botanists with author abbreviations 20th-century German botanists German taxonomists Women taxonomists 1883 births Women botanists 20th-century German women scientists Year of death missing