Hieracium murorum L.
Wall hawkweed
Wall hawkweed is a European and Greenland native that has found its way to North America prior to 1900. The rather curious name comes from its affinity for rocky slopes and walls.
Plants: 10–24″ (25–60 cm) in height, with hairy stems.
Leaves: Only 3-6 leaves appear at the base of the plant, sometimes with two or three more on the stems. Leaves are elliptic, 1¾–4 ⨉ ⅞–1¾″ (5–11 ⨉ 2.5–4.5 cm), sometimes mottled with purple. Leaves are unusual in shape, wide at the base, with large, forward-pointing teeth that fall somewhere between the designation of “tooth” vs. “lobe.”
Flowers: Flower heads appear as 5-8 corymbs. Flowers are yellow, with 30-50 or more florets, about ½″ (1.3 cm) in size. They flower from May to August.
Fruits: Cypselae are columnar, and 1/16–⅛″ (2.5–3 mm) long.
Habitats: Disturbed areas, rocky areas, fields, thickets, lawns.
This hawkweed comparison table is an aid to identifying hawkweeds and similar-appearing species.
Online References:
References:
9/29/2013 · Compass Harbor, Acadia National Park, Bar Harbor, Maine · ≈ 8 × 5″ (19 × 12 cm) 
ID is uncertain 
6/16/2012 · Brown St., Falmouth, Maine · ≈ 6 × 4½″ (14 × 11 cm) 
6/16/2012 · Brown St., Falmouth, Maine · ≈ 4 × 4″ (10 × 11 cm) 
6/16/2012 · Brown St., Falmouth, Maine · ≈ 7 × 6″ (18 × 15 cm) 
6/16/2012 · Brown St., Falmouth, Maine · ≈ 11 × 7″ (27 × 18 cm) 
9/29/2013 · Compass Harbor, Acadia National Park, Bar Harbor, Maine · ≈ 6 × 4″ (16 × 10 cm) ID is uncertain 
| 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 | murorum | “Of walls” |
Hieracium murorum description by Thomas H. Kent, not updated.
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