kingdevil hawkweed
Hieracium piloselloides Vill.


Hieracium piloselloides is an erect perennial, with a milky sap that can grow from 8-40 in. (20.3-101.6 cm) tall.
Leaves are mostly basal, pale green to whitish with soft hairs. The smooth stems are mostly leafless or with 1-2 small leaves.
Flower heads are clustered, yellow, 0.5 in. (1.3 cm) wide, and number up to 30 per plant. This plant blooms June-September.
The fruit is a dark brown that is flattened with clusters. It is very hairy.
Ecological Threat
Hieracium piloselloides produces mats of rosettes that dominate sites by out-competing other species for water and nutrients and by releasing alleopathic compounds from their own decaying leaves. They grow well in moist sunny grassy areas, but can tolerate some shade. They are becoming troublesome weeds in native meadows, prairies, pastures and lawns. Wilderness areas in the Pacific Northwest are at risk of invasion.


EDDMapS Distribution

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

State Regulated List

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

Taxonomic Rank

Kingdom: Plantae
Phylum: Magnoliophyta
Class: Magnoliopsida
Subclass: Asteridae
Order: Asterales
Family: Asteraceae
Genus: Hieracium
Subject: Hieracium piloselloides Vill.

Synonyms and Other Names

Other Common Names:
tall hawkweed


Plants - Forbs/Herbs