Atlas Flora of Montgomeryshire - Statistics
| Number of grid squares with land area in Montgomeryshire | |
| 10 km: 36 squares | Tetrad (2 km): 589 squares |
For the purposes of the field survey for the Flora of Montgomeryshire, species were categorized, on the basis of earlier information, as follows:
| Category | Estimated Distribution | Number of species | Precision for Recording |
| A | Widespread | 185 | 10 km |
| B | Intermediate | 452 | 2 km |
| C | Rare | 537 | 100 m |
Total number of species recorded since 1970: 1089
Mapped species: these are the A species at 10 km precision, and the B species plus 87 of the more frequent C species at 2 km precision.
Coincidence Map showing the Species Richness of Tetrads in Montgomeryshire
(The map is based on the 539 mapped B and C species only)
