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Hieracium longiberbe

long-bearded hawkweed, longbeard hawkweed

white hawkweed, white-flower hawkweed

Habit Plants 25–50+ cm. Plants 15–40(–90) cm.
Stems

proximally piloso-hirsute (hairs 2–8+ mm), sometimes glabrate, distally glabrous or piloso-hirsute (hairs 2–5+ mm).

proximally usually piloso-hirsute (hairs 1–6+ mm), rarely glabrous, distally glabrous.

Leaves

basal 0(–3+), cauline 6–12+;

blades spatulate to oblanceolate, 25–80(–100+) × 8–15(–25+) mm, lengths 3–5 times widths, bases ± cuneate, margins usually entire, rarely denticulate, apices obtuse to acute, abaxial faces piloso-hirsute (hairs 2–5+ mm), adaxial usually piloso-hirsute at margins (hairs 2–5+ mm), rarely glabrous.

basal (0–)3–8+, cauline 1–5(–12+);

blades oblanceolate, 40–100(–300) × 12–30(–60+) mm, lengths 3–5+ times widths, bases cuneate, margins usually entire, sometimes sinuately toothed, apices obtuse to acute, faces piloso-hirsute (hairs 1–6 mm), rarely glabrous.

Peduncles

usually stellate-pubescent, sometimes piloso-hirsute and/or stipitate-glandular as well, rarely glabrous.

usually glabrous, sometimes stipitate-glandular.

Involucres

campanulate, 7–10 mm.

± campanulate, (7–)8–10(–11) mm.

Florets

12–24+;

corollas yellow, 7–12 mm.

(6–)12–25+;

corollas yellow, 9–10 mm.

Phyllaries

12–15+, apices ± rounded, abaxial faces piloso-hirsute and stellate-pubescent.

8–13+, apices acuminate, abaxial faces piloso-hirsute (hairs 1–2+ mm), stellate-pubescent, and stipitate-glandular.

Calyculi

bractlets 9–13+.

bractlets 5–12+.

Heads

(3–)6–12+ in corymbiform arrays.

(3–)12–50+ in corymbiform to paniculiform arrays.

Cypselae

columnar, ca. 3.5 mm;

pappi of 32–40+, white or stramineous bristles in ± 2 series, 5–6 mm.

columnar, 2.5–4 mm;

pappi of 30–40+, stramineous bristles in ± 2 series, (4–)5–7 mm.

Hieracium longiberbe

Hieracium albiflorum

Phenology Flowering Jul. Flowering (May–)Jun–Sep.
Habitat Cliffs Chaparral, conifer forests, meadows, stream beds, serpentines, volcanics, around mineral springs
Elevation 30–100 m (100–300 ft) 10–2900 m (0–9500 ft)
Distribution
from FNA
OR; WA
[WildflowerSearch map]
[BONAP county map]
from FNA
AK; CA; CO; ID; MT; NV; OR; SD; UT; WA; WI; WY; AB; BC; NT; QC; SK; Mexico (Chihuahua, Sonora)
[WildflowerSearch map]
[BONAP county map]
Discussion

Hieracium longiberbe is known only from along the Columbia River.

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

Source FNA vol. 19, p. 289. FNA vol. 19, p. 292.
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. flagellare, H. greenei, H. gronovii, H. horridum, H. lactucella, 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. 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. traillii, H. triste, H. umbellatum, H. venosum, H. vulgatum
Synonyms Chlorocrepis albiflora
Name authority Howell: Fl. N.W. Amer., 395. (1901) Hooker: Fl. Bor.-Amer. 1: 298. (1833)
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