Hieracium albiflorum |
Hieracium piloselloides |
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white hawkweed, white-flower hawkweed |
glaucous hawkweed, glaucous King-devil, King devil, tall hawkweed, épervière des florentins |
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Habit | Plants 15–40(–90) cm. | Plants 15–40(–70+) cm. |
Stems | proximally usually piloso-hirsute (hairs 1–6+ mm), rarely glabrous, distally glabrous. |
proximally usually piloso-hirsute (hairs 2–4+ mm), rarely glabrous, distally usually glabrous, sometimes piloso-hirsute (hairs 1–3+ mm), stellate-pubescent, and/or stipitate-glandular. |
Leaves | 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. |
basal 3–8(–20+), cauline 0–2(–4+); blades oblanceolate to lanceolate, 30–100(–150+) × 8–20+ mm, lengths 2.5–8+ times widths, bases cuneate, margins entire or denticulate, apices rounded to acute, faces glabrous or piloso-hirsute (on midribs and at margins, hairs 1–4+ mm). |
Peduncles | usually glabrous, sometimes stipitate-glandular. |
piloso-hirsute (hairs 1–2+ mm), stellate-pubescent, and stipitate-glandular. |
Involucres | ± campanulate, (7–)8–10(–11) mm. |
campanulate, 5–7 mm. |
Florets | (6–)12–25+; corollas yellow, 9–10 mm. |
(40–)60–80+; corollas yellow, 6–9 mm. |
Phyllaries | 8–13+, apices acuminate, abaxial faces piloso-hirsute (hairs 1–2+ mm), stellate-pubescent, and stipitate-glandular. |
12–18+, apices acute to acuminate, abaxial faces piloso-hirsute (hairs 0.5–1.5+), stellate-pubescent, and stipitate-glandular. |
Calyculi | bractlets 5–12+. |
bractlets 3–12+. |
Heads | (3–)12–50+ in corymbiform to paniculiform arrays. |
(3–)10–30+ in subumbelliform or corymbiform arrays. |
Cypselae | columnar, 2.5–4 mm; pappi of 30–40+, stramineous bristles in ± 2 series, (4–)5–7 mm. |
columnar, 1.5–2 mm; pappi of 25–40+,white bristles in 1 series, 3–4 mm. |
Hieracium albiflorum |
Hieracium piloselloides |
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Phenology | Flowering (May–)Jun–Sep. | Flowering (May–)Jun–Aug(–Sep). |
Habitat | Chaparral, conifer forests, meadows, stream beds, serpentines, volcanics, around mineral springs | Disturbed sites |
Elevation | 10–2900 m (0–9500 ft) | 10–300(–1500) m (0–1000(–4900) ft) |
Distribution |
AK; CA; CO; ID; MT; NV; OR; SD; UT; WA; WI; WY; AB; BC; NT; QC; SK; Mexico (Chihuahua, Sonora)
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CT; DE; GA; IA; IL; IN; MA; MD; ME; MI; MN; MT; NC; NH; NJ; NY; OH; PA; RI; SC; VA; VT; WA; WI; WV; BC; NB; NF; NS; ON; PE; QC; Europe [Introduced in North America]
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Discussion | Plants called Hieracium praealtum Villars ex Gochnat (at least those called H. praealtum var. decipiens W. D. J. Koch) reputedly differ from members of H. piloselloides in having blades of their proximal leaves stellate-pubescent abaxially (M. L. Fernald 1950); such plants may be found in the flora and may merit taxonomic recognition. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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Source | FNA vol. 19, p. 292. | FNA vol. 19, p. 285. |
Parent taxa | Asteraceae > tribe Cichorieae > Hieracium | Asteraceae > tribe Cichorieae > Hieracium |
Sibling taxa | ||
Synonyms | Chlorocrepis albiflora | H. florentinum, Pilosella piloselloides |
Name authority | Hooker: Fl. Bor.-Amer. 1: 298. (1833) | Villars: Prosp. Hist. Pl. Dauphiné, 34. (1779) |
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