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Balsaminaceae - Tropical E. Africa
Syn. Impatiens oliveri
Oliver's Snapweed, Poor Man's Rhododendron
Shown: Flower bud, flowers and foliage
Impatiens sodenii is an evergreen perennial that blooms throughout the year in the immediate coastal climate of California; killed to the ground by a frost, it will regrow if frost is not too severe; can reach 2.5 m tall; flowers to 7.5 cm wide; flowers of the type are pink/lavender. White cultivar 'Madonna' available from Annie's Annuals:
"Impatiens (pronounced /ɪmˈpeɪʃənz/) is a genus of about 850–1,000 species of flowering plants, widely distributed throughout the Northern Hemisphere and tropics.
"Common names include impatiens, jewelweeds, and, somewhat ambiguously, "balsams" and "touch-me-nots". As a rule-of-thumb, "jewelweed" is used exclusively for Nearctic species, "balsam" is usually applied to tropical species, and "touch-me-not" is typically used in Europe and North America. Some species commonly planted in horticulture have altogether more fanciful names, such as "Busy Lizzie" (the well-known I. walleriana).
"Some species are annual plants and produce flowers from early summer until the first frost, while perennial species, found in milder climates, can flower all year. Regardless of their lifespan, the largest impatiens grow up to about 2 meters (c. 7 ft) tall, but most are less than half as tall.
"These plants derives their scientific name Impatiens (Latin for "impatient") and the common name "touch-me-not" in reference to their seed capsules. When the capsules mature, they "explode" when touched, sending seeds several meters away. This mechanism is also known as "explosive dehiscence"..." (Wikipedia)
Photographed in my garden in San Francisco, California