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- H. Rhodes.
- H.C. Carey & I. Lea (Firm)
- Haage & Schmidt.
- Haage, Friedrich Adolph
- Haak, J.
- Haartman, Joh. Gust.
- Haas, Georg,
- Haas, Meno,
- Hackius, Franciscus,
- Haeckel, Christian,
- Haenke, Thaddäus,
- Hagen, Hermann August,
- Haid, Johann Jacob,
- Haines, Henry Haselfoot,
- Hale, Josiah,
- Hale, Thomas
- Hale, Thomas J.
- Hales, Stephen,
- Hall, Elihu,
- Hall, James,
- Haller, Albrecht von,
- Hallowell, Edward,
- Hamilton, Edward,
- Hamilton, Francis,
- Hamilton, William,
- Hammel, Barry Edward,
- Hamsen Schönsperger.
- Hamy, E. T.
- Hanbury, Daniel,
- Hanbury, Thomas,
- Handel-Mazzetti, Heinrich,
- Handsch, Georg H.,
- Hans Schotten.
- Harford, W. G. W.
- Hariot, Paul,
- Harlin, Æstanus Emanuel.
- Harms, Hermann,
- Hartman, Ronald L.
- Hartog, Joannes.
- Harvard University.
- Harvey, F. L.
- Harvey, William H.
- Hasselt, Arend Ludolf van,
- Hasskarl, J. K.
- Haude und Spener.
- Häussle, J.
- Havard, Valery,
- Havell, Robert,
- Haworth, Adrian Hardy,
- Hayden, F. V.
- Hays, W. W.
- Head, J. Frazier
- Heckel, Augustin,
- Hediger, Nancy L.
- Hedrén, Adam,
- Hedrén, Elis,
- Hedwig, Johannes,
- Heer, Oswald,
- Hegelmaier, Christoph Friedrich,
- Heiden, Friedr. von der
- Heil, Kenneth D.
- Heinrich Georg Neubauer.
- Helin, Johannes,
- Hellmayr, C. E.
- Hemprich, Friedrich Wilhelm,
- Hemsley, W. Botting
- Henderson, I. F.
- Henderson, W. D.
- Henkel, Alice,
- Henry Shaw School of Botany.
- Henry, AimeÌ,
- Henry, Joseph,
- Henshaw, Henry W.
- Henslow, J. S.
- Herbario HAO.
- Herincq, B.
- Herlitz, Johannes Nicolaus.
- Hermann Uytwerf.
- Hermann, Paul,
- Herold, Johannes Basilius,
- Herr, Michael,
- Herrera, Cecilia.
- Hervey, E. Williams
- Herzog, Theodor Carl Julius,
- Hess, Anne Pomeroy,
- Heyland, Jean Christoph,
- Hier. Frobenium, et Nic. Episcopium.
- Hieronymum Lentz.
- Hieronymus Frobisch.
- Hildmann, H.,
- Hilgard, Eugene W.
- Hilgard, J. E.
- Hilgard, Theod. C.
- Hill, John,
- Hillebrand, W. F.
- Hillebrand, William,
- Hinds, Richard Brinsley,
- Hinrichs, Gustavus Detlef,
- Hippocrates
- Hirscht, Karl.
- Hitchcock, G. N.
- Hitchings, E. H.
- Hoch, Peter C.
- Hochstetter, Christian Ferdinand,
- Hoehne, F. C.
- Hoernes, Rudolf,
- Hoffmeister, Friderci.
- Hofverberg, Carl Fredrik.
- Hohenacker, R. Fr
- Hohenacker, R. Fr.
- Höjer, Axel.
- Hojer, L. M.
- Holbrook, John Edwards,
- Holford, J.
- Holland, Douglas
- Hollandsche Maatschappij der Wetenschappen.
- Höller, Chr.
- Hollick, Charles Arthur,
- Hollowell, Victoria C.
- Holm, Carl Otto.
- Hombron, Jacques Bernard,
- Hondt, Pieter de,
- Hooke, Robert,
- Hooker, Joseph Dalton
- Hooker, Joseph Dalton,
- Hooker, William Jackson,
- Hooker, William,
- Hooper, David,
- Hoopes, Abner
- Hoopes, Josiah,
- Hornstedt, Claës Fredrik,
- Horr, Asa,
- Horticultural Society of London.
- Hosford, F. H.
- Host, Nikolaus Thomas,
- Houtte, Louis van,
- Houttuyn, M.
- Howe, William,
- Howell, Thomas,
- Howth Demesne Gardens (Howth, Ireland)
- Hoysradt, Lyman H.,
- Hu, Hsen Hsu,
- Hughes, Griffith,
- Hull, Edward,
- Hultström, Carl Samuel,
- Humbert, H.
- Humboldt, Alexander von
- Humboldt, Alexander von,
- Hunter, C. L.
- Hunter, John M.
- Huppertz, Chas.