Found a 40 ft plus heavy thick vine growing in mid-California that climbs like a trumpet vine, has 4 inch flowers shaped almost the same as trumpet vine flowers, with the outer inch reddish pink but with a 3 inch yellow neck inside and out, and with glossy opposing single leaves instead of 3-4 ft compound leaves. What is it?
I first thought it might be a Mandevilla, then maybe a Crossvine, but the flowers of both aren't right. The flowers of this vine are too long, 4 inches, to be a Mandevilla or Crossvine, it has no seedpod, and the 5 petal tips aren't pointed but are rounded, with a v in the middle of each petal tip, like the top of a drawn heart. See photo.