Here's one list I found on the net. What sort of plant was it? Woody, perennial, annual, vine ? Here is a link that might be useful: plant family

Great plant! I wish that was near me so I could grab a cutting, LOL. Before reading any of the text I thought it sure looked like Harrisia bonplandii, so I'd agree with AZtreelover on that as a good candidate. It's definitely not the typical queen of the night P. greggii which I've grown for several years in the past at my last garden. Greggii has very thin, brittle stems that are very blue gray and the aereoles don't have such a nice white tuft. Let us know if you decide on a definite ID. It's a very neat plant and your pics are great as always! Keep us posted! Take care and thanks for highlighting this fun plant, Grant

in my world.. humidity of the vent in summer is not the issue in the great white north ... its the HEAT OF THE VENT in winter .... potentially bringing the tissue in and out of dormancy.. and basically freeze-drying it repeatedly ... which will kill the tissue ... you built a box .. and you are looking around in it.. look outside it .. now.. does the side of the house stay damp all summer ... i doubt it.. so if the siding is not constantly wet.. why would a plant be affected???? effected???? just dont go with anything that is stuffed full of old needles ... something that will shed older stuff.. w/o building up inside ... and i suspect you will be home free ... all that.. and just plant it far enough out that the dryer vent is a non-issue ... why do you have to squeeze something in that close anyway??? for me.. its the furnace vent .. and my solution ... die to the ground in winter hosta ... and of course.. there is no issue with summer.. since the heat is off by then ... i seem to think .. i tried zone pushing cham law's in there .. and they all died.. but that was primarily the law's.. regardless of the vent ... though it sure didnt help any .. lol ken

Randomly came across this from an old post. Seems quite fitting... To Quote Edwin: You mentioned that 'Niemetz' is from the Aureospicata group because of somethimes golden new growth which isn't golden but a creamy white, so it's one from the Argenteospicata group like 'Bialobok', "Byczkowski', 'Spring Ghost', 'Fruhlingsgold', Spring Blast' and 'Walnut Glen' The Aureospicata group contains the following cultivars: 'Golden Feathers' 'Maigold' 'Kornik 2000' 'Sunshine' 'Stanley's Golden' 'Gebelle's Golden Spring' 'Summer Gold' 'Early Gold' 'Colonial Gold'