the white powder is similar to the one on dudleya, albeit less dense. 1 &2 look like aeoniums with cilia. think 3 is some kind of euphorbia .....

rina thats how the powder is called?

Yes, one of the names used...farina: a fine mealy powder on the surface of some plants (from glossary of botanical terms)

You'd think they would call it something than "fine mealy powder". It looks similar to some powdery mildew I had on a Viola indoors. I'm glad to know what it is and that's it's not bad. Thanks both.

Agree with Rina on No 3, fairly sure it's Senecio kleiniiformis

...mealy: covered with coarse flour-like powder...also from glossary if botanical terms :)

OK, so the mealy in 'mealy bugs' is just a descriptor of what they look like. I'm glad they don't call powdered sugar mealy sugar, not that I eat it more than once a year or so. Learn something new every day here.

1&2 are Aeonium ‘Kiwi’

Today I went to the SF cactus/succulent show and on my way to the show I saw this house that had so many Aeoniums in their front yard. I have never seen so many concentrated in one spot.

3rd plant is

Senecio kleiniiformis