Yes, the large alien flowering cactus forms are Walli's Selenicereus Obtineriis.
I have made them larger than normal.
I believe you can find the model at his web site.
Following is Walli's description ( German run through Google translate.)
Today, there is something to report back by Ro-zeta. In the arid areas of the level Nerius this strange-looking plant was discovered. It is a cactus plant, which snakes-like forms branches. These in turn sit aerial roots that dig on contact with the ground, thus giving the plant in the area dominated by sand storms stop.
Unconfirmed rumors that she maintains with its pervasive roots firmly unwary animals then die in the dry and hostile environment after a short time.
The magnificent flowers open only at night. This individual has a height of about 80 cm and a diameter of about 70cm. Selenicereus obtineriis can be over 500 years old, it is not much higher, but can cover a floor area of 25 square meters! The photo was taken at night in the spotlight of research Rovers.
