I think this is not a monocot. This beautiful flower is called Blue Torenia (藍豬耳), of family SCROPHULARIACEAE (玄參科).
http://herbarium.gov.hk/subpages.aspx?id=7026
by Wilkin_Tsang
(Teacher)
at 2014-04-24 11:11:32
Thanks Wilkin. And the leaves are typical dicot one....So the column like structure is the wishbone-shaped stamens...
by Cherry_Chow
(Teacher)
at 2014-05-13 17:15:13
I have modified the title (from Orchid to Blue Torenia (藍豬耳)) and corresponding info and move the entry from Monocot to Plant in CUHK. Also removed the tags
http://herbarium.gov.hk/subpages.aspx?id=7026