Taken at the "New Zealand" section of San Francisco's Botanical Gardens.
"This is a Geranium - probably Geranium madritense (Madeira Cranesbill). Although it is not from New Zealand, it self-seeds throughout the botanical garden,
where we normally allowed it to grow and flower, since it is so beautiful." - Tony Morosco; former curator at the San Francisco Botanical Gardens at Strybing Arboretum, in Golden Gate Park, San Francisco.
--special thanks Tony Morosco for providing the information about this plant!