I had assumed this was Campsis radicans, but that vine is supposed to be invasive. I've had this one for more than 10 years and have never seen it come up anywhere else in the garden.

I don't grow the Trumpet Creepers/Trmpet Vines but perhaps your plant is the "Chinese Trumpet Creeper" (Campsis grandiflora): http://ag.sfasu.edu/UserFiles/... which is not supposed to be as aggressive as C. radicans.

It's very likely that this is it, Lin. The blooms on mine are larger than on other trumpet vines and the calyx is most definitely pointed. Thanks for doing this research.

zuzu: It was just a guess on my part but you are very welcome ... beautiful plant!

From the link you gave Lin..

The cross of C. radicans and
C. grandiflora produces Campsis X
tagliabuana, most often represented in
the nursery industry by the variety
‘Mme Galen’. The cross is an evident
mix of the two: a larger showier bloom
than the American species, but not
quite as large as C. grandiflora.

The simplest way to separate the
two species and the cross is a careful look at the calyx. The Chinese trumpet
creeper features a greenish calyx with long pointed lobes. The American trumpet
creeper enjoys a darker calyx with shorter lobes that are not pointed. The cross
lies in between.

I think it looks like the cross, Campsis x tagliabuana ‘Madame Galen’

http://www.google.co.uk/search...

While I was looking into the differences between the two, I ran into hundreds of warnings regarding the invasive nature of both, so now I'm doubting both ID's. I have good soil and good weather, so invasive plants are usually positively rampant to the point of madness in my garden, but my trumpet vine has never been the slightest bit invasive.

I grew it from a cutting of a vine around the corner from my house, and that one isn't invasive either.

It is possible that the two are being confused, from the pdf "In fact, a careful inspection of Campsis grandiflora images obtained via any internet
search proves with little (doubt) that there’s a problem of recognition in the Campsis crowd."

If you can check the calyx you might have a better idea, to me they look neither dark nor entirely green, but photos are not the best to go by.

Mobot states that 'Madame Galen' is aggressive but is more restrained than C. radicans, if it was growing here I doubt it would stand much chance of living for long but it is sold here. Madame Galen has been around since the mid 19th century, and it has been awarded the AGM here so the possibility of it being that is high as award plants are widely sold for obvious reasons.

http://www.missouribotanicalga...

You're right: The calyx on mine is nicely pointed, but not dark or green. The problem of the "very aggressive spreader" and other such descriptions remains, however. This is not "aggressive" in any sense of the term and it does not "spread."

It probably is Madame Galen, so now I just have to figure out why it isn't invasive here.

Campsis radicans grows wild here and the calyx are light and pointed. Here are pictures of the wild ones I took here.
http://www.wildflowersoftexas.... If this is from a wild plant, Campsis radicans is the only one known to grow wild in the US, of course if it was from one planted by someone else it could be another variety.

As far as aggressiveness is concerned it could just be your plant or environment. The one I have does pop-up in different places, but did not do so for probably at least 10 years.

Thank you, Jay. I think mine's been here for only about 11 or 12 years, so that answers my question. It could start popping up in the wrong places anytime now.

That calyx does indeed look like mine, but the blooms on that one are lighter and probably smaller, so mine probably is Campsis x tagliabuana 'Madame Galen.' Thanks for the information about invasiveness. I suppose I will have to consider removing it if that does happen, but for now I'll just enjoy the tropical look it provides.

If you like it let grow, and if does put out runners just dig them up. So far mine has not been so aggressive that I would cut it down yet.

Sounds great! Thanks.