~ John Mills Parrish, 2002
| Code | Description |
|---|---|
| C | Common throughout Montgomery County |
| FC | Fairly common in most, but not all, areas of Montgomery County |
| UC | Uncommon. Seen infrequently at scattered localities in the County. |
| R | Rare. Currently known in only 5 to 10 locations in Montgomery County |
| VR | Very rare. Less than 5 locations currently known in Montgomery County |
| X | Extirpated. Historically known in the County, but not known to currently occur |