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Hieracium gronovii

Hieracium gronovii L.

Hieracium gronovii L. var. foliosum Michx.

Gronovius’ Hawkweed, Hairy Hawkweed

KingdomPlantaePlants, but not fungi, lichens, or algae (from Stearn’s Botanical Latin)
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 31" (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:

Hieracium gronovii at Illinois Wildflowers

Hieracium gronovii on missouriplants.com

Hieracium gronovii on Discover Life

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

Hieracium gronovii on gobotany.newenglandwild.org

Hieracium gronovii at Maine.gov’s Department of Conservation Maine Natural Areas Program

Hieracium gronovii on 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)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 5 × 3½" (13 × 9.2 cm) ID is uncertain

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 4½ × 5" (11 × 13 cm) ID is uncertain

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, MA
≈ 4 × 4" (10 × 11 cm)

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

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

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

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

Hieracium gronovii description by Thomas H. Kent, last updated 11 Oct 2013.

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Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

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

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 14 × 9" (35 × 23 cm) ID is uncertain

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, MA
≈ 8 × 12" (21 × 31 cm)

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

8/10/2013 · Stone Arch Bridge Trail, Near Flat Rock Hill, Dunstable, MA
≈ 4 × 6" (10 × 16 cm)

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

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

Hieracium gronovii (Gronovius’ Hawkweed, Hairy Hawkweed)

5/24/2012 · Nashua River Rail Trail, Groton Center, Groton, MA
≈ 13 × 18" (33 × 46 cm) ID is uncertain

Range:

About this map...