Please help me to ID these cacti and succulent

I bought 2 cacti from a shopping mall.They are not in good condition.I am going to change their pots and soil but I cannot idetify their names.

The third one is a succulent.It's flower is pink-white and blooming top of the plant in summer..I have this plant about 5 years.I have cut them every spring.And it is growing without any problem.

Please help me to identify them..

 

Probably Echinocereus triglochidiatus

Myrtillocactus geometrizans

Tradescantia sillamontana - grows best on the dry side but not really a succulent

 

Many many thanks.
If I can see the flowers of the cacti it will be my feast day..They are wonderful..

 

i dunno about Echinocereus triglochidiatus. they look like some etoliated columnar seedlings. But I can't tell what type. You could be right, but I've not seen that particular species appear like the specimen posted.
I'm not trying to critique, just wondering what you're looking for in characteristics to make an ID. Such info may help me be a better botanist.

 

Is #1 some sort of lophocereus?

That's what pops into my mind when I see it (without checking).

 

Unless any of you can come up with something better for #1, I will say it is Echinocereus triglochidiatus. I do grow the species and the stems can and do look like that. My ID is a bit more informed than just a guess. Do check before making a guess. Will know for sure when the plant blooms.:-) The stems do appear to be thicker than you all assume. It does not appear to be a columnar species at all.

 

The first one is definitely Echinocereus. Looks kind of like a robust E. pentalophus to me, but there are several Echinocereus species that have that look, including some forms of triglochidiatus.

 

Echinocereus. Quite Right!

I checked, it definately looks like a pentalophus.

I confused it with a lophocereus ( lophocereus mieckleyanus
)
http://www.columnar-cacti.org/lophocereus/

A good link to use for trying to ID your cacti.

Wazungy

 

Thanks for all.
As I see, Echinocereus is going to bloom.(I hope)
Myrtillocactus geometrizans-Is this blooming one?

 

You'll need to wait a few years to get flowers on your Myrtillocactus. Given the right conditions, they can get really huge like the one found here...http://www.cactiguide.com/cactus/?genus=Myrtillocactus&species=geometrizans

 

I hope one day I have the same flowers on my cacti..