Hieracium pilosella

Linnaeus

Sp. Pl. 2: 800. 1753.

Common names: Mouse-ear hawkweed épervière piloselle
Introduced
Synonyms: Hieracium pilosella var. niveum Müller Argoviensis Pilosella officinarum
Treatment appears in FNA Volume 19. Treatment on page 283. Mentioned on page 279, 284.

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. Heads usually borne singly, rarely 2(–3). Peduncles piloso-hirsute and stellate-pubescent. Calyculi: bractlets 8–15+. Involucres hemispheric to obconic, 7.5–9 mm. Phyllaries 20–34+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute as well. Florets 60–120+; corollas yellow (often each with abaxial red stripe), 8–13+ mm. Cypselae columnar, 1.5–2 mm; pappi of 30+, white bristles in 1 series, 4–5 mm.


Phenology: Flowering May–Aug.
Habitat: Disturbed sites (sandy or gravelly soils, fields, lawns, roadsides)
Elevation: 10–100+ m

Distribution

V19-388-distribution-map.gif

Introduced; St. Pierre and Miquelon, B.C., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., Que., Conn., Del., Ga., Ky., Maine, Md., Mass., Mich., Minn., N.H., N.J., N.Y., N.C., Ohio, Oreg., Pa., R.I., Tenn., Vt., Va., Wash., W.Va., Europe.

Discussion

Selected References

None.

Lower Taxa

None.
... more about "Hieracium pilosella"
John L. Strother +
Linnaeus +
Mouse-ear hawkweed +  and épervière piloselle +
St. Pierre and Miquelon +, B.C. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, Que. +, Conn. +, Del. +, Ga. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Oreg. +, Pa. +, R.I. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +  and Europe. +
10–100+ m +
Disturbed sites (sandy or gravelly soils, fields, lawns, roadsides) +
Flowering May–Aug. +
Introduced +
Hieracium pilosella var. niveum +  and Pilosella officinarum +
Hieracium pilosella +
Hieracium +
species +