Common Knapweed/Hoverfly

Centaurea nigra is a species of flowering plant in the daisy family known by the common names Lesser Knapweed, Common Knapweed and Black Knapweed. A local vernacular name is Hardheads.
It is native to Europe but it is known on other continents as an introduced species and often a noxious weed.

Yellow Iris (Yellow Flag)

It is a herbaceous perennial plant growing to 1-1.5 m (or a rare 2 m) tall, with erect leaves up to 90 cm long and 3 cm broad. The flowers are bright yellow, 7-10 cm across, with the typical iris form. The fruit is a dry capsule 4-7 cm long, containing numerous pale brown seeds.