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Hieracium pilosella

Hieracium pilosella L.

 

Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed

KingdomPlantaePlants, but not fungi, lichens, or algae
SubkingdomTracheobiontaVascular plants—plants with a “circulatory system” for delivering water and nutrients
DivisionMagnoliophytaFlowering plants, also known as angiosperms
ClassMagnoliopsidaDicotyledons—plants with two initial seed leaves
SubclassAsteridaeA large class that encompasses asters
OrderAsteralesFlowering plants with a central disk flower and surrounding petals, like daisies
FamilyAsteraceaeThe aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers
GenusHieraciumFrom Greek hierakion, “a hawk,” from Pliny’s belief that hawks strengthened their eyesight by eating these plants
Speciespilosella“A little hairy”: pilosus, “hairy;” and ella, “diminutive”

About plant names...

Mouse ear hawkweed is a European native, introduced to North America, where it has escaped. In some regions of the Pacific northwest it is considered an invasive species.

Identification: Mouse ear hawkweeds are exceptionally hairy, even for hawkweeds—especially the leaves, whose undersides are soft enough to have earned the name “mouse ears.” Upper leaf surfaces are also covered with coarser long white hairs. Plants have a basal rosette of leaves which are unlobed, elliptic, pointed to blunt, and ⅜-4" (1-10 cm) × ⅛-¾" (5-20 mm). Leaves have a prominent white midvein. Solitary yellow flowers appear 1¾-20" (5-50 cm) above the base of leaves, on stems with stiff dark hairs and no leaves, each flower up to 1" (2.5 cm) across. They appear from June to September. Common catsear, Hypochaeris radicata, looks similar, but its leaves are slightly lobed and less hairy.

This hawkweed comparison table is an aid to identifying hawkweeds and similar-appearing species.

Medical: In the Middle Ages, the milky sap secreted by this species, then called Auricula muris, was used as a cough remedy and for lung ailments. All hawkweeds secret this bitter sap, but this sap is somewhat less more palatable. This same astringency led to its use as a clotting agent for wounds.

Online References:

Hieracium pilosella at the Bugwood Wiki

Hieracium pilosella at the University of Wisconsin's Robert W. Freckmann Herbarium

Hieracium pilosella on Discover Life

Hieracium pilosella on the Virginia Tech Weed Identification Guide

Hieracium pilosella on www.oregon.gov

Hieracium pilosella on Botanical.com

References:

Hains, Arthur; Farnsworth, Elizabeth & Morrison, Gordon (illus.), Flora Novae Angliae: a Manual for the Identification of Native and Naturalizaed Higher Vascular Plants of New England, Yale University Press, 2011, p. 412

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

8/11/2009 · Townsend, MA
≈ 6 × 5" (16 × 12 cm) ID is uncertain

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/18/2016 · Pearl Hill State Park, Ashby, MA

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/18/2016 · Pearl Hill State Park, Ashby, MA

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 9 × 6" (23 × 15 cm)

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 9 × 6" (22 × 14 cm)

Hieracium pilosella description by Thomas H. Kent, last updated 5 Oct 2016.

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Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/5/2013 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 7 × 7" (17 × 16 cm)

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

8/11/2009 · Townsend, MA
≈ 6 × 6" (15 × 16 cm) ID is uncertain

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 15 × 10" (39 × 26 cm)

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

8/11/2009 · Townsend, MA
≈ 15 × 10" (39 × 26 cm) ID is uncertain

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/2/2016 · Townsend Wildlife Management Area, Townsend, MA

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/2/2016 · Townsend Wildlife Management Area, Townsend, MA

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/5/2013 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 11 × 7" (28 × 18 cm)

Hieracium pilosella (Mouse Ear, Mouse Ear Hawkweed, Mouseear Hawkweed, Mouse-ear Hawkweed)

6/18/2016 · Pearl Hill State Park, Ashby, MA

Range:

About this map...