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flagellate hawkweed, hawkweed, whip hawkweed

Habit Plants 5–12(–20+) cm. Plants 25–60+ cm.
Stems

proximally piloso-hirsute (hairs 2–4+ mm) and stellate-pubescent, distally piloso-hirsute (hairs 1–4 mm), stellate-pubescent, and stipitate-glandular.

proximally glabrous or stellate-pubescent, distally glabrous or stellate-pubescent.

Leaves

basal 8–12+, cauline 0(–2+);

blades spatulate to oblanceolate, 20–45(–130+) × 8–20(–25+) mm, lengths 2–3+ times widths, bases cuneate, margins entire, apices rounded to acute, abaxial faces piloso-hirsute (hairs 1–4+ mm) and stellate-pubescent, adaxial piloso-hirsute (hairs 1–4+ mm).

basal 5–6+, cauline 0(–1+);

blades oblanceolate to spatulate, 40–80 × 18–45+ mm, lengths 3–5+ times widths, bases cuneate, margins usually entire, apices rounded to obtuse, abaxial faces piloso-hirsute (hairs 1–3+ mm), adaxial glabrous.

Peduncles

piloso-hirsute, stellate-pubescent, and stipitate-glandular.

stellate-pubescent and stipitate-glandular.

Involucres

hemispheric, (9–)12–13 mm.

hemispheric to campanulate, 8–10 (× 6–9) mm.

Florets

90–120+;

corollas yellow (often each with abaxial red stripe), 6–10+ mm.

30–60+;

corollas yellow, ca. 12 mm.

Phyllaries

30–40, apices acuminate, abaxial faces stellate-pubescent, sometimes, piloso-hirsute and stipitate-glandular as well.

13–21+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute as well.

Calyculi

bractlets 13–15+.

bractlets 5–8+.

Heads

2–4+ in ± umbelliform to corymbiform arrays.

8–12+ in corymbiform arrays.

Cypselae

columnar, 1–2.5 mm;

pappi of 25–40+, white bristles in 1 series, 4–5+ mm.

(black or red-brown) columnar, 3–4 mm;

pappi of ca. 40+, stramineous bristles in ± 2 series, 6–7 mm.

Hieracium flagellare

Hieracium traillii

Phenology Flowering May. Flowering Jun–Aug.
Habitat Disturbed sites, roadsides, forest edges Shaley sites
Elevation 10–300(–600+) m (0–1000(–2000+) ft) 1000–1300 m (3300–4300 ft)
Distribution
from FNA
CT; IN; MA; ME; MI; NH; NY; OH; PA; VA; VT; BC; NB; NS; PE; QC; Europe [Introduced in North America]
[WildflowerSearch map]
[BONAP county map]
from FNA
KY; MD; OH; PA; VA; WV
Discussion

The type of Hieracium flagellare may have resulted from a cross between plants of H. caespitosum and H. pilosella (A. Cronquist 1980).

(Discussion copyrighted by Flora of North America; reprinted with permission.)

Source FNA vol. 19, p. 284. FNA vol. 19, p. 293.
Parent taxa Asteraceae > tribe Cichorieae > Hieracium 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. greenei, H. gronovii, H. horridum, H. lactucella, H. longiberbe, H. longipilum, H. megacephalon, H. murorum, H. nudicaule, H. paniculatum, H. parryi, H. pilosella, H. piloselloides, H. pringlei, H. robinsonii, H. sabaudum, H. scabrum, H. schultzii, H. scouleri, H. traillii, H. triste, H. umbellatum, H. venosum, H. vulgatum
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. pilosella, H. piloselloides, H. pringlei, H. robinsonii, H. sabaudum, H. scabrum, H. schultzii, H. scouleri, H. triste, H. umbellatum, H. venosum, H. vulgatum
Synonyms H. flagellare var. amauracron, H. flagellare var. cernuiforme, H. flagellare var. pilosius, Pilosella flagellaris H. greenii
Name authority Willdenow: Enum. Pl., suppl.: 54. (1814) Greene: Pittonia 4: 226. (1900)
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