Hieracium scabrum Michx.
Rough hawkweed, sticky hawkweed
Rough hawkweed is native to North America.
Plants: Up to 3½′ (1 m) tall. Hairs on stems and leaves make it feel rough to the touch. Stems are unbranched and leafy.
Leaves: There are a few short-stalked basal leaves, but most are cauline—on the stem. Leaves are alternate, 2–8 ⨉ ½–2″ (5–20 ⨉ 1.3–5 cm), decreasing in size further up the stem, and oval-elliptic in shape, tapering to a dull point. Larger leaves may have a few irregular teeth.
Flowers: A single stem is topped with a heavily branched array of 5-50 flower heads, which may be conical or flattish in shape and up to 1′ (30 cm) high. Each flower is ½–1″ (1.3–2.5 cm) around, with 30-60 ray florets, but no disc florets. Flowers appear in late summer.
Fruits: Florets are replaced by achenes with tufts of tan hair. Mature achenes are about ⅛″ (3 mm) long, narrowly cylindrical in shape, truncate at the apex, and dark brown.
Habitats: In sandy soils, including anthropogenic habitats, meadows, fields and woodlands.
Online References:
8/14/2014 · Oak Hill, Littleton Conservation Land, Littleton, Massachusetts · ≈ 8 × 5″ (21 × 13 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 8 × 5″ (20 × 13 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 3 × 3″ (8.4 × 7.5 cm) 
8/16/2020 · Long Reach Preserve, Harpswell, Maine · ≈ 4½ × 7″ (12 × 18 cm) 
8/14/2014 · Oak Hill, Littleton Conservation Land, Littleton, Massachusetts · ≈ 9 × 6″ (23 × 16 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 5 × 8″ (13 × 20 cm) 
8/14/2014 · Oak Hill, Littleton Conservation Land, Littleton, Massachusetts · ≈ 6 × 5″ (15 × 13 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 4½ × 6″ (11 × 14 cm) 
8/16/2020 · Long Reach Preserve, Harpswell, Maine · ≈ 4 × 6″ (11 × 14 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 5 × 8″ (13 × 20 cm) 
8/6/2025 · Linekin Preserve and Burley Loop, Boothbay, Maine · ≈ 5 × 8″ (12 × 19 cm) 
8/12/2014 · Andres Institute of Art, Big Bear Mountain, Brookline, New Hampshire · ≈ 6 × 9″ (16 × 23 cm) 
8/12/2014 · Andres Institute of Art, Big Bear Mountain, Brookline, New Hampshire · ≈ 5 × 3½″ (13 × 9.2 cm) 
8/12/2014 · Andres Institute of Art, Big Bear Mountain, Brookline, New Hampshire · ≈ 7 × 10″ (16 × 25 cm) 
| Kingdom | Plantae | Plants, but not fungi, lichens, or algae (from Stearn's Botanical Latin) |
| Subkingdom | Tracheobionta | Vascular plants—plants with a “circulatory system” for delivering water and nutrients |
| Division | Magnoliophyta | Flowering plants, also known as angiosperms |
| Class | Magnoliopsida | Dicotyledons—plants with two initial seed leaves |
| Subclass | Asteridae | A large class that encompasses asters |
| Order | Asterales | Flowering plants with a central disk flower and surrounding petals, like daisies |
| Family | Asteraceae | The aster family, which also includes daisies and sunflowers; from the Greek ἀστήρ, “star,” for the star-shaped flowers |
| Genus | Hieracium | From Greek hierakion, “a hawk,” from Pliny’s belief that hawks strengthened their eyesight by eating these plants |
| Species | scabrum | From the Latin scabr- or scaber, meaning rough or scurfy |
Hieracium scabrum description by Thomas H. Kent, not updated.
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