China and Japan
C. sasanqua is visited by Colletidae bees, wasps, flies, butterflies, and birds. 
"A Theaceae plant, Camellia (C.) sasanqua THUNB. (Japanese name “sazanka”), which is native to Japan, has been widely cultivated as an ornamental plant in Japanese garden. The flower buds of this plant are used for the similar purpose to those of C. japonica (Japanese name “tsubaki”), which has been used for the treatment of blood vomiting and bleeding due to internal and external injury, and also as antiinflamatory, tonic, and stomachic in Japanese folk medicine." 
"Camellia sasanqua or sazanka, family Theaceae, is an evergreen plant cultiated in a number of countries as a foodstuff. Sazanka has been shown to exhibit both anti-inflammatory and anti-allergic activities." 
 Subroto, J. J. G. (2014). Isolation of hyperoside and isoquercitrin from Camellia sasanqua as antioxidant agents.
 Matsuda, H., Nakamura, S., Fujimoto, K., Moriuchi, R., Kimura, Y., Ikoma, N., ... & Yoshikawa, M. (2010). Medicinal Flowers. XXXI. Acylated oleanane-type triterpene saponins, sasanquasaponins I—V, with antiallergic activity from the flower buds of Camellia sasanqua. Chemical and Pharmaceutical Bulletin, 58(12), 1617-1621.
 Yumoto, T. (1987). Pollination systems in a warm temperate evergreen broad‐leaved forest on Yaku Island. Ecological Research, 2(2), 133-145.