I have been growing this plant for a number of years and yet to come across the plant name. It has bloomed over the summer last year and still I can't find the name. Does anyone know this plant? It grows as a vine with opposite foliage that has a soft fuzzy feel. The flowers are green. Any help will be greatly appreciated.

I guess it is an hoya

My guess is the Hoya related Milkweed (Asclepias) but I'm not really sure, it just reminded me of Milkweed: Spider Milkweed (Asclepias viridis)

edited to say: I forgot to ask is this a perennial garden plant or a plant that's grown indoors as a houseplant?

Does milkweed make vines?

According to the construction of the body, I am convinced that it is the hoya, but I have my doubts on the flowers. Maybe SRQHoyas's help.
the leaves are stiff, leathery, flowers sticky?
I would have named it Hoya bearded
but the leaves are more like a ficus, shedding the latex?

One "Milkweed that has a climbing habit is Climbing Milkweed Vine (Funastrum cynanchoides)

The blooms also remind me a bit of Cynanchum but the leaves don't look right:
Honeyvine Milkweed (Cynanchum laeve)
http://www.pittstate.edu/depar...

Treehugger: Can you show photos of more of the plant, like the top side of the leaves and the growth habit? Also, do you grow this in the ground as a garden plant or a potted plant? Does it thrive the winters in Pa?

From what I see of the leaves it does remind me of a Hoya I once grew but that never bloomed for me. If it's a houseplant rather than something that grows outdoors in Pennsylvania, it could very well be a Hoya.

resolved! Silkvine
Silkvine (Periploca graeca)
Apparently some hybrid, Periploca graeca x, or Periploca laevigata x

Stefan, Thank you for the identity of Treehuggers plant! I searched and searched and found Cynanchum (Swallowort) whose bloom looked similar and Calotropis whose bloom also had a resemblance but I just could not find an exact match. I still haven't found a photo of a bloom the same color but it sure resembles Periploca laevigata: http://www.floradecanarias.com...

with the color of the flower never don't worry, it is not decisive, determine the number and shape of stamens, pistil, body building, deployment, and the shape of the sheets ...

YEP! I am sure it is a Periploca laevigata plant. I'll take a better picture of the foliage and the whole plant although now after winter without the correct light it looks a bit thin in the leaf department. I forgot to mention that it does drip latex when you break a leaf off. How do you do that Stefan?

so-so
you've got a pretty flower

A picture of the fuzzy foliage and the plant growing from the caudex.