@Tapirlord I have never made the effort to look into the genus beyond a quick glance at the key which suggests they may as well be impossible to distinguish without the plants in hand. I treat each species the same as they are all exotic annuals and likely function the same way in the environments in which they are found.
Looks similar to this *Polycarpon tetraphyllum* but looks partly different too, eg. the apparently sessile flowers growing in amongst the broad bracts(?) and broad leaves with a flat to the ground prostrate habit – perhaps just adaptations to the colder climate there.
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