is a specific kind of: flower.

is a broader term that covers: field speedwell, Veronica agrestis | corn speedwell, Veronica arvensis | bird's eye, germander speedwell, Veronica chamaedrys | common speedwell, gypsyweed, Veronica officinalis | purslane speedwell, Veronica peregrina | thyme-leaved speedwell, Veronica serpyllifolia.

is a member of: genus Veronica.