| Peru-Bolivia-Chile |
September 2002 |
| Mallorca |
May 2002 [Botanical field trip] |
| Mexiko |
March 2002 |
| Austria |
December 2001 |
| Chile-Argentina |
November 2001 [Botanical field trip] |
| France-Liechtenstein |
July-August 2001 [Botanical field trip with
students of Greifswald University] |
| Mallorca |
May 2001 [Botanical field trip] |
| Cuba |
March 2001 |
| Austria |
December 2000 |
| Argentina-Bolivia-Chile |
September 2000 |
| Hong Kong |
August 2000 |
| England (London) |
August 2000 |
| Maldives |
March 2000 |
| Austria |
December 1999 |
| Equador |
September 1999 |
| Italy |
August 1999 [Botanical field trip] |
| Thailand |
March 1999 |
| Thailand-Nepal-Australia-Indonesia (Bali) |
September-October 1998 |