The nursery industry is so innately unsatisfactorily lucrative, that to us nurserymen, a ‘poor man’s rhododendron’ is any rhododendron that we grow. To everyone else, it is Imaptiens sodenii, a tender perennial that gets to six feet tall and wide or even larger on plump, softly succulent stems. It succumbs to even mild frost in winter, but regenerates rapidly by summer. It prefers partial shade, and can roast if too exposed to direct sunlight on warm days. Too much shade is rarely a problem.
The two inch wide flowers are typically very pale shades of pink, lavender or slightly blushed white. At least one modern variety has brighter white flowers with reddish pink centers. Bloom continues as long as weather is warm. The seed capsules are not much to look at, but explode to disperse their seeds when disturbed. The soft, rich green leaves are about three to six inches long.
Tony Tomeo 
Goodness, your perennial version is so pretty. Our version is called spotted jewelweed and is orange. It’s a native plant–I actually have quite a bit of it bordering my little woods–and hummingbirds love it.
Supposedly it is a good remedy for poison ivy–but I hear that about a lot of things that I am not sure that I would like to try.
Ours dies every winter but I suspect it regenerates from seed even if it is not truly perennial. Some years it it much more robust than others but that probably has to do with moisture.
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Jewelweed is something that I hear about, but have not experienced. It might live in San Francisco, but I do not remember it. This particular impatien commonly dies back to the ground for winter, even without frost, but grows like a weed from the roots.
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