BugwoodWiki Article

mouseear hawkweed
Hieracium pilosella L.


Hieracium pilosella is a perennial weed that can grow from 4-12 in. (10.2-30.5 cm) in height.
Leaves are elliptic, rosette, 1-4 in. (2.5-10.2 cm) long, covered in long white hairs and have a white vein down the middle. Flower stalks are long, leafless, and covered in stiff dark hairs.
Flowers are bright yellow, 1 in. (2.5 cm) across, and clustered in groups of at least 2 flowers. Flowers resemble that of dandelions. Flowering occurs from June to September.
Fruits can be found purple to black, 0.08 in. (2 mm) long with off white hairs that are 0.2 in. (5 mm) long. The fruit are usually dispersed by the wind.
Ecological Threat
Hieracium pilosella does not tolerate shade and can be found in disturbed areas such as fields, waste areas, pastures, and roadsides. It is native to Europe.

General Description:[edit]

Hieracium pilosella is a perennial herb, about 2.5 dm tall, arising from a very short rhizome with many fibrous roots.

Diagnostic Characteristics:[edit]

Hieracium pilosella can be distinguished from other hawkweeds by its solitary yellow flowers, its hairs, rosette growth form, and its stoloniferous habit.


Image Sets
View other image sets:


EDDMapS Distribution - This map is incomplete and is based only on current site and county level reports made by experts, herbaria, and literature. For more information, visit www.eddmaps.org

EDDMapS Distribution

State Invasive List - This map identifies those states that list this species on their invasive species list. For more information, visit Invasive.org

State Invasives List

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Asterales
Family: Asteraceae
Genus: Hieracium

Other System Links

Plants: HIPI
Bayer: HIEPI
GRIN: 104350
ITIS: 37720


Category: Forbs/Herbs