according to the wiki, the japanese camellia (camellia japonica) is one of the best known species of camellia. sometimes called the rose of winter. it is a member of the theaceae family or tea family.
hong kong gordonia are seen commonly in country parks. and all kinds of camellia are flowering away at the camellia lanes in botanic garden like the pink camellia oleifera 油茶, the white and pink marble colour camellia gigantea 大彩雲 at hong kong park . and every winter the camellia reticulate 普安茶 are shinning white at hong kong university.
參考維基百科: 大頭茶 – 原產地為香港，屬於山茶科國產大頭茶屬。常綠灌木，特徵樹皮光滑，木質蒴果，帶翅種子。花期為每年十月至翌年一月。科 family: 山茶科theaceae ; 屬 genus: 大頭茶屬 gordonia
reference from hkwetlandpark: hong kong gordonia (gordonia axillaris) – hong kong gordonia is a common native shrub or small tree in hong kong. it is very attractive in winter when its large white flowers are in blossom. since it can tolerate poor soil and harsh environments, hong kong gordonia is always used as the pioneer species in a secondary forest.
reference: the international camellia society