The highlight of this small scene in the David C. Lam Asian Garden is Cotoneaster horizontalis var. perpusillus, or rockspray cotoneaster. Occasionally, you will find this taxon listed as Cotoneaster perpusillus, but I suspect the scientific name used in the link from the common name will prevail, since that is the name used in the Flora of China treatment of Cotoneaster (PDF), i.e., Cotoneaster horizontalis var. perpusillus. By any name, though, I still find the bright pinkish-red colour appealing on a grey, rainy day.