I entered a great photo of a Maguey flower, and was disqualified for not being a cactus. I think you're mistaken, and a Maguey is a cactus with a spectacular flower, but you are the botanist, not me
Some of you guys got it quite right.It is a macro pic of a rusted old pot (not copper).The 30 mm is from a zoom len at the wide angle side.
In the rules you state no capture date restrictions, and I was DQ for using a photo from 2010!!!!!!