Assuming it is one of the two, you should be able to tell by the following descriptions on eFloras. The thing that sticks out to me when I very quickly skimmed the descriptions is that M bracteata grows from horizontal rhizomes while M loriformis has no rhizomes.

Murdannia bracteata: http://www.efloras.org/florataxon.aspx?flora_id=3&taxon_id=240001471

Murdannia loriformis: http://www.efloras.org/florataxon.aspx?flora_id=3&taxon_id=240001477

Below is the key to the Murdannia genus for China which includes both species.

Murdannia key: http://www.efloras.org/florataxon.aspx?flora_id=2&taxon_id=121330

Here is a link that might be useful: Murdannia Key