Merxmüller’s interests led him to the genus Hieracium, and eventually to an abiding interest in the Compositae family.
As a botanist he specialized in studies of the genus Hieracium.
Examples of apomixis can be found in the genera Crataegus (hawthorns), Amelanchier (shadbush), Sorbus (rowans and whitebeams), Rubus (brambles or blackberries), Poa (meadow grasses), Hieracium (hawkweeds) and Taraxacum (dandelions).
Radyr Hawkweed is the common name of Hieracium radyrense, a very rare endemic species restricted to Radyr in south Wales, UK.
Hieracium snowdoniense, the Snowdonia hawkweed, is a plant endemic to Snowdonia, North Wales.
Karl Hermann Zahn (3 December 1865, Baiertal – 8 February 1940, Haigerloch) was a German botanist who was a leading authority regarding the genus Hieracium (hawkweed).
They feed on a wide variety of plants and grasses, including Achillea millefolium, wormwood (Artemisia), carrot (Daucus), tansy (Tanacetum), Inula and hawkweed (Hieracium).