Ceratostigma willmottianum Stapf, Bot. Mag. 140: t. 8591 1914. ;

China (Gansu, Guizhou, Sichuan, Yunnan), SE-Tibet as per Catalogue of Life;

This is Chinese Plumbago… 
Ceratostigma willmottianum ..pics taken from Royal Botanical Garden, Melbourne

very nice. was it sticky to fingers when you touched it? 

Thanks … No it was not sticky, fruits may be, but there were none…!!

Nice pictures … I have seen another Species at Golden Gate Park, San Francisco.