What plant is this, seen at the Allan Gardens?
This is a Schizanthus "orchid" (actually not a real orchid) called Schizanthus pinnatus ("butterfly orchid" or "poor man's orchid"). 




  It is native to Chile but the plants are also cultivated as ornamentals. It is commonly known as the "small butterfly" ("mariposita") or "small, white butterfly" ("mariposita blanca").


Description


Annual plant of 20-50 cm in height
Stem: Glandulous-pubescent
Leaves: 2.5-3 cm long; pinnatisect (divided into 6-8 pairs in oblong-linear segments, entire or separated). 
Flowers: white, pink or violet, 2-3 cm diameter, arranged in panniculate inflorescences, sometimes dichotomous.