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Hieracium gronovii L.

Gronovius’ hawkweed, hairy 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
SpeciesgronoviiFor Jan Fredrik Gronon, for whom I can find no information other than that she lived from 1690-1762

About plant names...

I couldn't determine whether this is a native hawkweed, or one that originated in Europe.

Identification: Plants are 12-18″ (30-45 cm) in height, rarely up to 2½′ (80 cm), with hairy stems. Stems, leaves, and stolons secrete a milky sap when cut. Most of the leaves are a basal rosette of spatula-shaped leaves up to 3½-4″ (9-10 cm) × 1″ (2.6 cm). Leaves are alternate, usually unlobed and toothless, and oblanceolate, obovate, elliptic, or spatulate. Flower heads are typically composed of 25-50 flowers, and take the form of a raceme composed of several branching cymes. This compound inflorescence is called a thyrse. Each flower is yellow, ½-1″ (1.3-2.5 cm) across, with 20-40 rays. (An otherwise similar species, Hieracium scabrum, has 40-100 rays.) Flowers appear from July to October.

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

Online References:

Illinois Wildflowers

Discover Life

The University of Wisconsin's Robert W. Freckmann Herbarium

Maine.gov’s Department of Conservation Maine Natural Areas Program

SEINet—the Southwest Environmental Information Network

References:

Clemants, Steven; Gracie, Carol, Wildflowers in the Field and Forest, Oxford University Press, 2006, p. 162

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, Mass­a­chu­setts

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

7/31/2012 · Bemis Rd Conservation Area, Pepperell, Mass­a­chu­setts · ≈ 8 × 5″ (19 × 13 cm) ID is uncertain

Hieracium gronovii L. var. foliosum Michx.

 

Hieracium gronovii description by Thomas H. Kent, last updated 5 Jul 2020.

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Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

7/31/2012 · Bemis Rd Conservation Area, Pepperell, Mass­a­chu­setts · ≈ 6 × 4″ (15 × 10 cm) ID is uncertain

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

7/31/2012 · Bemis Rd Conservation Area, Pepperell, Mass­a­chu­setts · ≈ 4½ × 3″ (11 × 7.9 cm) ID is uncertain

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, Mass­a­chu­setts

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, Mass­a­chu­setts

Hieracium gronovii (Gronovius’ hawkweed, hairy hawkweed)

7/31/2012 · Bemis Rd Conservation Area, Pepperell, Mass­a­chu­setts · ≈ 4½ × 3″ (11 × 7.9 cm) ID is uncertain

Range:

About this map...