Flora of North America species comparison

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Hieracium pilosella

mouse-ear hawkweed, épervière piloselle
Habit Plants 10–25(–40+) cm.
Stems

proximally piloso-hirsute (hairs 1–3+ mm) and stellate-pubescent, distally piloso-hirsute (hairs 1–2 mm), stellate-pubescent, and stipitate-glandular.
Leaves

basal (2–)5–10+, cauline 0(–3);

blades elliptic to ± oblanceolate, 10–45(–75+) × 5–12(–18+) mm, lengths 2–4(–6+) times widths, bases cuneate, margins entire, apices acute, faces piloso-hirsute (hairs 2–7+ mm) and stellate-pubescent.
Peduncles

piloso-hirsute and stellate-pubescent.
Involucres

hemispheric to obconic, 7.5–9 mm.
Florets

60–120+;

corollas yellow (often each with abaxial red stripe), 8–13+ mm.
Phyllaries

20–34+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute as well.
Calyculi

bractlets 8–15+.
Heads

usually borne singly, rarely 2(–3).
Cypselae

columnar, 1.5–2 mm;

pappi of 30+, white bristles in 1 series, 4–5 mm.

Hieracium pilosella
Phenology Flowering May–Aug.
Habitat Disturbed sites (sandy or gravelly soils, fields, lawns, roadsides)
Elevation 10–100+ m (0–300+ ft)
Distribution
from FNA
CT; DE; GA; KY; MA; MD; ME; MI; MN; NC; NH; NJ; NY; OH; OR; PA; RI; TN; VA; VT; WA; WV; BC; NB; NF; NS; ON; QC; SPM; Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
Source FNA vol. 19, p. 283.
Parent taxa Asteraceae > tribe Cichorieae > Hieracium
Sibling taxa
H. abscissum, H. albiflorum, H. alpinum, H. argutum, H. aurantiacum, H. bolanderi, H. brevipilum, H. caespitosum, H. carneum, H. crepidispermum, H. fendleri, H. flagellare, H. greenei, H. gronovii, H. horridum, H. lactucella, H. longiberbe, H. longipilum, H. megacephalon, H. murorum, H. nudicaule, H. paniculatum, H. parryi, H. piloselloides, H. pringlei, H. robinsonii, H. sabaudum, H. scabrum, H. schultzii, H. scouleri, H. traillii, H. triste, H. umbellatum, H. venosum, H. vulgatum
Synonyms H. pilosella var. niveum, Pilosella officinarum
Name authority Linnaeus: Sp. Pl. 2: 800. (1753)
Web links 
Unless otherwise noted, all data comes from the online version of the Flora of North America, who have made most of their content available via a Creative Commons license (CC BY 4.0).



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