The botanical journal Watsonia was a publication specializing in research into the native flora of the British Isles. It was named after the British phytogeographer Hewett Cottrell Watson (1804-1881). The journal was published by the Botanical Society of the British Isles. It was first published in 1949 with the subtitle "journal & proceedings of the Botanical Society of the British Isles".
Watsonia is being progressively digitized by the BSBI and made available online with unrestricted access.