Lady's bedstraw, a native wild flower that weaves its way between other plants in the border and fills the gaps with a mist of tiny yellow flowers.
A lily whose label I lost long ago, but that blooms well every year, even in the current drought.
A few years ago I grew several Verbascum species that seeded themselves everywhere, so that a random assortment flowers every year - I can't remember what this large-flowered species is, but it's a very handsome plant.
The yellow knapweed Centaurea macrocephala. Those little black dots are pollen beetles, that are irresistibly drawn to yellow flowers - in vast numbers.