and i am??

And my name is??

1st is Echinopsis subdenudata.

Last has monstrose at the end of its name.

Middle one doesn't look familiar.

middle- stenocactus thurberi
last- Possibly cereus pruinosis monstrose?

This is the flower for your Echinopsis. They opened during the night as they always do and their fragrance fills the air with such a beautiful scent....just wonderful! Sad that they will be gone tonight.

nice, i cant wait!!!!!!!!!

do these self pollinate or do i need another plant?? anyone??

While they are monoecious, I don't know absolutely if they are self pollinating, but it is my understanding you need another plant to pollinate. Also, using a pup from the same plant probably won't work, either.

what does 'monoecious' mean??

Wiley,
One explanation at the link below.

Another, copied from saylorplants.com:
Monoecious and Dioecious Plants

Most plant have bisexual flowers with functional male and
female flowers. Some are self sterile, requiring pollination
from another plant to produce seed.

Dioecious plants have male (staminate) flowers on one plant,
and female (pistillate) flowers on another plant.

Monoecious plants have separate male and female flowers on
the same plant.

Here is a link that might be useful: Monoecious vs. Dioecious