| Edward J. Alexander |
Algae; Spermatophytes; Iridaceae |
| Miguel N. Alexiades |
Spermatophytes; Ethnobotanical studies |
| Harry A. Allard |
Spermatophytes; Bryophytes |
| John F. Allen |
Spermatophytes |
| John Alphaeus Allen |
Algae; Bryophytes; Spermatophytes |
| Timothy F. Allen |
Algae; Characeae; Spermatophytes |
| Oscar Dana Allen |
Algae; Characeae; Bryophytes; Spermatophytes |
| Bruce Hampton Allen |
Bryophytes; Lichens |
| Jessica L. Allen |
Lichens |
| Joseph F. Ammirati |
Mycology |
| André Márcio Amorim |
Bromeliaceae; Sapindaceae; Dichapetalaceae |
| Gladys P. Anderson |
Lichens; Spermatophytes; Bryophytes |
| Lewis E. Anderson |
Bryophytes |
| Dr. Charles L. Anderson |
Algae |
| William Russell Anderson |
Spermatophytes; Pteridophytes; Malpighiaceae; Lichens |
| Carol R. Annable |
Poaceae; Spermatophytes |
| Kate E. Armstrong |
Manilkara (Sapotaceae); Pteridophytes; Spermatophytes |
| Rosita Arvigo |
Medicinal Plants |
| Daniel E. Atha |
Spermatophytes; Pteridophytes; Polygonaceae; Acalypha; Flora of North America |
| Nephi Duane Atwood |
Spermatophytes; Hydrophyllaceae; Phacelia |
| Coe F. Austin |
Bryophytes; Lemnaceae; Spermatophytes; Lichens |
| Charles F. Baker |
Algae; Mycology; Spermatophytes; Bryophytes |
| William L. Balée |
Spermatophytes; Ethnobotanical studies |
| Michael J. Balick |
Spermatophytes; Economic Botany |
| Miguel Bang |
Spermatophytes; Bryophytes; Lichens |