My guess would be Croton sp. Here is a link that might be useful: Croton capitatus

I burned in the spring. It seemed like everything took off real fast this year due to perfect rain patterns and immediate warm weather. This probably overwhelmed the clover right away since I only saw a couple plants here and there. All the plants are much taller than any of the books say they should be. I have real fertile soil with some farmland groundwater runoff with all the manure related nutrients. Good for the prairie plants but good for the quackgrass also. That's my next/current pest. you should swing by and take a look. it's at peak color right now. HB

I see that this swap is over, but I have yet to find any fellow epiphyllum lovers on this site. So I thought this would be a good place to possible get in contact with someone who wants to trade. I have night blooming cereus, epiphyllum "disocactus akermanii", Easter cactus with red blooms, ad an epiphyllum with unknown color blooms (it's either orange or fuschia) I also have curly spider plant babies, curly lipstick plant, jade, and a couple different aloes.

The 'prickles' aren't very big -- they aren't big thorns like you would see on a rose or a blackberry stem. One description called the prickles 'stiff hairs'. The web site below calls them 'hooked hairs', which sounds close to your description that called them velcro. Apparently the vines use these hairs to cling and climb on things. I was amazed to find that people plant these things in their gardens as ornamentals, and the web site below calls them "desirable gardening and commercial species"! Hope you can get rid of yours. --BC -- Here is a link that might be useful: Humulus japonicus vines are covered with hooked hairs