Occurrence

The occurrence status categories used here were established by Naturalis, who kindly offered them to us. We are grateful that we use them. The list of indigenous species in Belgium is composed of categories 1a (Original), 2a (Established) en 2b (Establishing).

0 To be confirmed
Reported to the Belgium list, but not yet evaluated

0a Correct, to be checked
Present in Belgium, but precise status is not yet evaluated

1a Indigenous
The taxon has arrived by its own means (not introduced by man) and is reproducing in Belgium since at least 10 years.

1b Accidental/Periodic
The taxon has arrived by its own means (not introduced by man) and is reproducing in Belgium for less than 10 years. Also valid for occasional (winter guests) which occur periodically by accident in our country.

2a Established
Introduced by man and surviving on its own for at least 100 years after introduction (reproducing).

2b Establishing
Introduced by man and surviving on its own for between 10 and 100 years (reproducing).

2c Recently introduced
Introduced by man and surviving on its own for less than 10  and 100 years (reproducing).

2d Introduced, not establishing
Introduced by man and not reproducing. These species are often not entered.
NB: Long-living species can only belong to these categories: 2a Established (at least 3 generations, 2 locations) and 2C en 2d. Cf. National Botanical Garden of Belgium at Meise.

3a Insufficient data
Reported for Belgium, but status is unclear. E.g. names without adequate citation, incidental observations that cannot be interpreted, or dubious records mentioned in literature, but of which no evidence has been preserved.

3b Incorrect record
Reported for Belgium, but by mistake, e.g. because of a wrong determination.

3c Expected
Not mentioned in Belgium but should potentially be found or could be recorded in the near future because of its presence in neighbouring countries.

3d Auct
Incorrectly used name, may be because of a mistake in a determination table (Auctor nec). Only for species absent from Belgium. If it is known to be a Belgian record, 3b is chosen. It has to be stated in the remarks field which species is meant.

4 Others
Names with no direct concern for Belgium, but that for some reason should be included in the list.