English common names for Galeopsis speciosa include large-flowered hempnettle and Edmonton hempnettle. The latter name is almost certainly a reference to the Edmonton area of London, rather than the Canadian city.
Galeopsis speciosa is native to some portion of Eurasia (asserted in one reference as “Eurosiberian Boreo-temperate”), but the extent of its pre-agricultural native range is likely impossible to determine. For example, it is considered an archaeophyte in the British Isles, meaning its introduction to the area predates 1500 CE, and possibly even prehistoric times. Wherever its native origin, the species is now widespread across much of Europe and Russia, where it is primarily associated with cultivated and other human-impacted landscapes.
According to Wikipedia, Galeopsis speciosa is “widespread across Canada”. However, with only 7 records of collection in 4 provinces (with the only collection in one province occurring 65 years ago), that statement seems a bit of a stretch. There is also a claim that the “plant is poisonous, causing paralysis“. That assertion is directly parroted on a number of other web sites; it looks to be based on some Russian works that I’ve not been able to track down. In researching that claim, I discovered some excellent Russian resources:
- AgroAtlas, the Interactive Agricultural Ecological Atlas of Russia and Neighbouring Countries. The entry on Galeopsis speciosa goes into some detail on its morphology and economic (weedy) significance.
- Plantarium.ru, a non-commercial effort to document the plants of the former USSR, with a heavy emphasis on photography. The entry on Galeopsis speciosa contains over one hundred images!
The Plantarium.ru site, when translated into English, also gives rough translations of the common names used in the region. The preferred common name is Пикульник красивый, or “beautiful galeopsis”.