William Watson (1858-1925) was a British botanist and horticulturist. He was a gardener at the Royal Botanic Gardens, Kew from 1879, Assistant Curator 1886-1901 and Curator 1901-1922. "THE Cactus family is not popular among English horticulturists in these days, scarcely half a dozen species out of about a thousand known being considered good enough to be included among favourite garden plants. Probably five hundred kinds have been, or are, in cultivation...