| How to read Flora Nordica maps - the symbols | Show map with province info |
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Occurrence and status are visualized with the help of symbols representing different combinations of states of five parameters:
| PARAMETER | THE TWO ALTERNATIVES (and how they are shown): | |||||
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permanence |
"resident" = population surviving by seed at least 10 years, or strong vegetative spreading | (=filled) | "ephemeral" = not known to have been resident | (=unfilled) | ||
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age |
"old" = present before c. 1700 | (=black) | "new" = arrived later | (=grey) | ||
| human interference | "native" = arrived without man's interference [not shown for "old"] |
(=square) | "alien" = not native |
shown as "state unknown" (=round) | ||
| present status | "extinct", or ephemeral up to 1950 | (=slash) | "present" = not known to be extinct, or ephemeral occurrences after 1950 |
(= |
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| frequency |
"rare" = up to c. 10 localities | (=small symbol) | "not rare" | (=large symbol) | ||
| For example, |
The following combinations occur: |
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= resident, old | |
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= resident, new, native | |
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= ephemeral, no post-1950 occurrences | |
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A questionmark is used in some doubtful cases. During review, the symbol 
may be used to show a need for additional information.