Do roses grow on trees???

[dreamshark]

We're just back from a visit to Portland. As expected, the weather was rainy and cold, but there were still flowers blooming everywhere, including this beautiful thing that appears to be a rose tree. The trunk looks like a tree trunk and no rose thorns were in evidence, but they sure looked like roses to me. Is this for real? I know Portland fancies itself a "City of Roses" but still...