המועדפים של genjitsu

I found this vine growing in a recently reclaimed area. It looked like two different species with the same flower. But they grew in close proximity and seemed to always appear together, even with different growth habits (broadleaf ground-cover and thin-leaf-grass). INaturalist suggests these are different species but its suggestion for the grass-like form was unlikely (maybe the wind made the picture inconclusive). Anyway, I’m open to suggestions.