by F. P. Jonker
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Heyerdahl's Kon-Tiki theory and its rela...
Asclepiadaceae
Gentianaceae--Menyanthaceae
Oenotheraceae
Ueber einige Gentianaceae aus Surinam
Rhizophoraceae
Systematic anatomy of the monocotyledons
On a new genus of plants of the family B...
On Myostoma, a new genus of the Burmania...
Morphologische, Embryologische Und Syste...
On a new genus of plants of the family o...
Note on the Burmanniacee of Japan