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Standards: POSS (Plant occurrence and status scheme)

A standard for recording the relationship between a plant and a place

General principles:

• the taxon should be known and taxonomically distinct (normally, this standard will be used for species, but it can be applied at any taxonomic level)
• the area must be defined (have definite boundaries), but it can be of any size

There are 7 fields:

1. Occurrence

• present
• assumed present
• doubt about presence
• extinct
• recorded as present in error
• absent
• no information

2. Native Status

• native
• assumed to be native
• doubtfully native
• formerly native (extinct)
• not native
• recorded as native in error
• no information
• none of the above
• not applicable

3. Introduced Status

• introduced
• assumed to be introduced
• doubtfully introduced
• formerly introduced (extinct)
• not introduced
• recorded as introduced in error
• no information
• none of the above
• not applicable

4. Introduction Agency

• introduced by humans
• introduced by natural means
• no information
• not applicable

5. Cultivated Status

• cultivated outdoors
• cultivated indoors
• assumed to be cultivated
• doubtfully cultivated
• formerly cultivated (extinct)
• not cultivated
• recorded as cultivated in error
• no information
• none of the above
• not applicable

6. Area Distribution Completeness

• distribution complete
• distribution incomplete
• not known whether distribution complete
• not applicable

7. World Distribution Completeness

• distribution complete
• distribution incomplete
• not known whether distribution complete

Reference (Gillett et al., 1996)