If you do not think it is Centaurium tenuiflorum, it might be Schenkia australis. Could you do a close up from a high resolution image showing the style? I quote from PlantNET. 'Style slightly bifid; stigma lobes reniform to shoeshaped, fleshy' (Centaurium) and 'Style not divided to subcapitate; stigma lobes rhombic to fan-shaped, not fleshy' (Schenkia). There is also a differece in the way the stems cm off from each other but I cannot see that from your photo.