Publication
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Botanical exploration in the Doma Peaks region, New Guinea Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(1), 87-135.January 1970
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Miscellaneous notes on New Guinea plants IX Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(2), 563-565.January 1970
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Halodule emarginata nov. sp., a new sea-gras from Brazil (Potamogetonaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(1), 65-66.January 1970
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Studies in the family Thelypteridaceae II. A comparative study of the type-species of Thelypteris Schmidel, Cyclosorus link, and Ampelopteris Kunze Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(1), 195-215.January 1970
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Der Elevations-Effekt bei einigen Taraxacum-Arten der Schweiz Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(2), 419-427.January 1970
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Revision of the genus Aponogeton (Aponogetonaceae) Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(2), 457-487.January 1970
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Structure and floristics of a montane grassland/forest transition, Doma Peaks region, Papua Article
Blumea: Biodiversity, Evolution and Biogeography of Plants, 18(1), 71-86.January 1970
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Over de groeiplaatsen van Pulmonaria officinalis L. en Gagea lutea (L.) Ker-Gawl. in Bekendelle Article
Gorteria: tijdschrift voor de floristiek, de plantenoecologie en het vegetatie-onderzoek van Nederland, 5(6), 90-92.January 1970