About Hieracium lachenalii Suter
Hieracium lachenalii Suter is a common weed, with mature plants growing between 4 inches (10 centimeters) and 36 inches (91 centimeters) tall when flowering. It has a short, stout rhizome. Its leaves are broadly elliptic, can reach up to 5 inches (13 centimeters) in length, taper toward the base, and have toothed edges. Each flower head contains 40 to 80 ray florets, and has no disc florets. Bracts surround each flower head, and the receptacle — the basal part of the flower that supports the florets — is flat and free of hairs or scales. Flower heads typically start growing clustered together, and later become somewhat solitary on long, leafless stems. The stalks just below each flower head are covered in scattered, simple black hairs with glandular tips, and contain a milky substance. Pale yellow flowers bloom throughout the entire summer. It produces dark brown achene fruits. This species is native to most of Europe, and has been introduced to temperate regions of North America and Australia. It can sometimes be found growing in disturbed soils.
