Flora of North America species comparison

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Hieracium flagellare

flagellate hawkweed, hawkweed, whip hawkweed
Habit Plants 5–12(–20+) cm.
Stems

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

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

hemispheric, (9–)12–13 mm.
Florets

90–120+;

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

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

bractlets 13–15+.
Heads

2–4+ in ± umbelliform to corymbiform arrays.
Cypselae

columnar, 1–2.5 mm;

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

Hieracium flagellare
Phenology Flowering May.
Habitat Disturbed sites, roadsides, forest edges
Elevation 10–300(–600+) m (0–1000(–2000+) 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]
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.
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. 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
Synonyms H. flagellare var. amauracron, H. flagellare var. cernuiforme, H. flagellare var. pilosius, Pilosella flagellaris
Name authority Willdenow: Enum. Pl., suppl.: 54. (1814)
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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