Convolvulus sabatius, pronounced "Con-vol-vew-lus", an oldie but a goodie that is in full flower at the moment.
The above is the original cultivar that is generally a well-priced low spreading groundcover. The flowers close up at night, reopening when the light reappears in the morning.
We only occasionally stock the original variety, preferring to offer the newer versions from PGA. These have the same shaped flower but a slightly larger leaf and more variation in colour selection. The newer cultivars also seem to be denser and less "gappy" in growth habit.
'Purple Moon' and 'New Blue Moon' for instance are much deeper in colour -
https://www.pga.com.au/Plants/Plant....?plant_id=3669
https://www.pga.com.au/Plants/Plant....?plant_id=3245
'Artic Moon' is pure white -
https://www.pga.com.au/Plants/Plant....?plant_id=3670
There is also the dual colour 'Two Moons' -
https://www.pga.com.au/Plants/Plant....?plant_id=2577
