| title | ISBN-13 | year of publication |
|---|---|---|
| African Species of Oldenlandia L.Sunsu Hiern et K.Schumann | 978-0-7204-8350-5 | 1951 |
| Materials for a Monograph on the Strobilanthinae | 978-0-7204-8351-2 | 1944 |
| Notes on the Acanthaceae of Java | 978-0-7204-8348-2 | 1948 |
| Thunbergia Species of the Malesian Area | 978-0-7204-8349-9 | 1955 |
| Various Aspects of Biology | 978-0-7204-8352-9 | 1962 |