Smooth oleaster is often described as a shrub, but it’s not a typical shrub; it’s best described as a climbing shrub or a sarmentose shrub.
The long, extending branches act in a vine-like fashion, scrambling up nearby trees and hooking onto tree limbs. The second photograph shows a branch that has flopped away from the main plant, seeking outward to find yet another victim to climb up; the growing tip of the branch is to the left of the image. If the branch were upright, the small hook-like branchlet in the centre of the photograph would be pointing down, perfect for latching on and supporting the vine-like branch.
Douglas Justice, UBC Botanical Garden Curator of Collections, describes the tubular flowers of smooth oleaster as “intensely fragrant–gardenia-like with a hint of orange blossom” (and they were). I should add that it took quite a few sessions to capture an acceptable image of the flowers, as the glossy foliage in poor light conditions kept on throwing off the exposure settings with the small point-and-shoot camera I was using at the time.