Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Asterids
Order: Lamiales
Family: Oleaceae
Tribe: Jasmineae
Genus: Jasminum
Species: J. mesnyi
Binomial name: Jasminum mesnyi
Synonyms: Jasminum primulinum
Common names: Primrose jasmine, Japanese jasmine.
Jasminum mesnyi is a species of fast growing, flowering, rambling, evergreen shrub native to Vietnam and southern China (Guizhou, Sichuan, Yunnan). Jasminum mesnyi is a hardy scrambling evergreen shrub with long trailing stems and can grow up to 3 m tall and can spread to 2 m wide.
Solitary, semi double, bright yellow, tubular, fragrant flowers appear in late spring and summer. The flowers have only two stamens.
The dark green, stiff, straight stems are square in cross-section.
The dark leaves are opposite and are trifoliate (divided into three leaflets).
The first group of photos are of the single flower form.
A photo of a leaf showing the very fine spines on its margins
The photos below are of the shrub that has semi-double flowers.
In this photo you can see the square stem.
Thanks to Wikipedia for text and information: https://creativecommons.org/licenses/by-sa/3.0/