There are at least nine members of the St. Johnswort and Waterwort order: Theales found in Montana. Some of these species are exotics (not native to Montana).Exotic species have been deliberately or accidentally introduced to areas outside of their native geographic range and are able to reproduce and maintain sustainable populations in these areas. These exotic populations may also be referred to as alien, introduced, invasive, non-native, or non-indigenous.
St. John's wort Family: Clusiaceae Hypericum anagalloides, tinker's-penny Hypericum majus, larger Canadian St. John's-wort Hypericum perforatum, common St. John's-wort Hypericum scouleri, western St. John's-wort Hypericum scouleri subsp. nortoniae, western St. John's-wort Hypericum scouleri subsp. scouleri, Scouler's St. Johns-wort
Waterwort Family: Elatinaceae Elatine brachysperma, short-seeded water-wort Elatine californica, California water-wort Elatine triandra, longstem water-wort
Further reading
See also List of dicotyledons of Montana
Notes