Burmannia coelestis

Hello @geechartier, do you have additional pictures of similar plant from nearby areas? This one features the characteristics between B. coelestis and B. chinenesis. Besides having prominent double-margined perianth typical of B. coelestis, the flowers appear twisted with somewhat wavy wings. Additionally, the stems look thicker and fleshier (though I'm unsure if this trait is consistent in the species), which makes me suspect it could be B. chinensis.

@supakan_sim thank you. I am pretty sure these are from two different plants. There were loads of them! I have now added all of my Burmannia observations, some of which are from the exact same location. For example: https://www.inaturalist.org/observations/255555958 https://www.inaturalist.org/observations/255555956 https://www.inaturalist.org/observations/255555955

Thank you too, @geechartier!! That's lots of them there. My conclusion falls towards B. coelestis, however, such a strange and interesting population. The margins of both inner and outer perianths are so standout—they shouldn't be this exaggerated in B. chinensis. And the wavy wings trait is vary among individuals growing in the mentioned areas (or even on the same plant). Plus, the twist in B. chinensis is neater in my opinion. (see B. chinensis: https://www.inaturalist.org/observations/97126883, https://www.inaturalist.org/observations/231983819, https://hkcww.org/hkplant/readid.php?id=1603) This is my thought.