| Polynesian Plant Studies 6–18 | 1981/01/01 | English | |
| A History of Botanical Exploration in Amazonian Ecuador, 1739–1988 | 1993/01/01 | English | |
| Begoniaceae Part I: Illustrated Key; part II: Annotated Species List | 1986/01/01 | English | |
| The mosses of Juan Fernandez Islands | 1975/01/01 | English | |
| The Genera of Bambusoideae (Poaceae) of the American Continent: Keys | 1980/01/01 | English | |
| Vascular System of the Male and Female Florets of Raddia brasiliensis (Poaceae: Bambusoideae: Olyreae) | 1990/01/01 | English | |
| A Contribution to the Guianan Flora: Dalechampia, Haematostemon, Omphalea, Pera, Plukenetia, and Tragia (Euphorbiaceae) with Notes on Subfamily Acalyphoideae | 1997/01/01 | English | |
| Flora of Dominica, Part 2: Dicotyledoneae | 1991/01/01 | English | |
| Pollen morphology and the phylogenetic realtionships of the Berberidaceae | 1981/01/01 | English | |
| Classification of the Outlying Species of New World Panicum (Poaceae: Paniceae) | 1985/01/01 | English | |
| The Phareae and Streptogyneae (Poaceae) of Sri Lanka: A Morphological-Anatomical Study | 1987/01/01 | English | |
| Caryopsis morphology and classification in the Triticeae (Pooideae: Poaceae) | 1993/01/01 | English | |
| Flora of Micronesia, 2: Casuarinaceae, Piperaceae, and Myricaceae | 1975/01/01 | English | |
| Partial Flora of the Society Islands: Ericaceae to Apocynaceae | 1974/01/01 | English | |
| A Scanning Electron Microscope Survey of the Epidermis of East African Grasses, IV | 1986/01/01 | English | |
| A Monograph of the Genus Eperua (Leguminosae: Caesalpinioideae) | 1975/01/01 | English | |
| Epidermal features and spikelet micromorphology in Oryza and related genera (Poaceae: Oryzeae) | 2001/01/01 | English | |
| A Synopsis of the Lichen Genus Xanthoparmelia (Vainio) Hale (Ascomycotina, Parmeliaceae) | 1990/01/01 | English | |
| Fine Structure of the Cortex in the Lichen Family Parmeliaceae Viewed with the Scanning-electron Microscope | 1973/01/01 | English | |
| Three Indo-Pacific Thelypteris Species Reinterpreted and a New African Species Described | 1972/01/01 | English | |
| A Scanning Electron Microscope Survey of the Epidermis of East African Grasses, III | 1985/01/01 | English | |
| Phylogenetic Systematics as the basis of comparative biology | 1990/01/01 | English | |
| The genus Aphelandra (Acanthaceae) | 1975/01/01 | English | |
| Revision of the Genus Psyllocarpus (Rubiaceae) | 1979/01/01 | English | |
| Flora of Micronesia, 5: Bignoniaceae–Rubiaceae | 1993/01/01 | English | |
| The Woody Bamboos (Poaceae: Bambuseae) of Sri Lanka: A Morphological-Anatomical Study | 1988/01/01 | English | |
| Morden-Smithsonian Expedition to Dominica: The Lichens (Thelotremataceae) | 1974/01/01 | English | |
| Taxonomic Revision of the Chiliotrichum Group sensu stricto (Compositae: Astereae) | 2009/01/01 | English | |
| A Scanning Electron Microscope Survey of the Epidermis of East African Grasses, I | 1981/01/01 | English | |
| Swollen-Thorn Acacias of Central America | 1974/01/01 | English | |