"blacklight" writes:
on my website www.rent-a-cloud.com there is a photo 'CACTUS
FLOWER' (under 'Greencards'). Could somebody, please, tell me its
correct common and botannical names? It is a cactus that grows in tall
multiple columns and, in this case, in temperate climate near Sydney.

Your message didn't show up on my news server so I'm piggy backing on John's
response.

I can't see enough of the actual plant and that is pretty vital to
identifying the plant. The flower looks very like the one on my Nopalxochia
phyllanthoides "Dautche Kaiserin" but that is a draping cacti so it can't be
that.
http://www.plantoftheweek.org/week122.shtml