"There's fennel for you, and columbines:
there's rue for you; and here's some for me:
we may call it herb-grace o' Sundays:
O you must wear your rue with a difference..."
But it's also kind of pretty. This rue is Ruta chalepensis, so-called fringed rue for the frilly appurtenances on the flowers. Resting on the fleshy leaf there is a boatman fly, pogonortalis doclea, not doing anything special or interesting, just enduring (or enjoying?) the smell of rue.