| LeRoy K. Henry |
Algae; Mycology; Spermatophytes |
| Augustine Henry |
Spermatophytes; Bryophytes |
| Frederick Joseph Hermann |
Bryophytes; Spermatophytes; Carex; Cyperaceae; Bryophytes |
| Larry C. Higgins |
Spermatophytes |
| Albert S. Hitchcock |
Spermatophytes; Poaceae; Pteridophytes; Bryophytes |
| Charles Leo Hitchcock |
Spermatophytes; Flora NW USA |
| Malcolm F. Hodges |
Lichens |
| Wilson Hoehne |
Spermatophytes; Arecaceae |
| Frederico C. Hoehne |
Spermatophytes; Bryophytes |
| Kjeld A. Holmen |
Bryophytes; Musci |
| Patricia K. Holmgren |
Spermatophytes |
| Noel H. Holmgren |
Scrophulariaceae; Intermountain Flora; Spermatophytes |
| John M. Holzinger |
Bryophytes; Spermatophytes; Mosses |
| Grace E. Howard |
Mycology; Spermatophytes; Bryophytes; Lichens |
| Marshall A. Howe |
Algae; Bryophytes; Mycology |
| Robert Root Ireland, Jr. |
Bryophytes |
| Howard S. Irwin |
Spermatophytes; Legumes; Lichens |
| Edwin James |
Spermatophytes; Major Stephen H. Long Expedition |
| Jomar Gomes Jardim |
Spermatophytes; Rubiaceae |
| George S. Jenman |
Pteridophytes; Spermatophytes; Phanerogams; Bryophytes |
| George T. Johnson |
Lichens; Bryophytes |
| Marcus E. Jones |
Mycology; Pteridophytes; Spermatophytes |
| Jacquelyn A. Kallunki |
Spermatophytes; Lichens |
| David D. Keck |
Spermatophytes |
| William Ashbrook Kellerman |
Algae; Bryophytes; Mycology; Spermatophytes |