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.

"fine" is not a number.

... more about "Hieracium pilosella"
piloso-hirsute +, stipitate-glandular +  and stellate-pubescent +
scarious +
ovate +  and lanceolate +
racemiform +, umbelliform +, thyrsiform +, paniculiform +  and corymbiform +
indeterminate +  and determinate +
John L. Strother +
Linnaeus +
cuneate +
compound +  and simple +
4.5 cm45 mm <br />0.045 m <br /> (7.5 cm75 mm <br />0.075 m <br />) +
1.2 cm12 mm <br />0.012 m <br /> (1.8 cm18 mm <br />0.018 m <br />) +
1 cm10 mm <br />0.01 m <br /> (4.5 cm45 mm <br />0.045 m <br />) +
elliptic;more or less oblanceolate +
5mm;12mm +
tuberculate +, rugose +, muricate +  and smooth +
deltate;lanceolate or linear +
filiform +
Mouse-ear hawkweed +  and épervière piloselle +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.8 cm8 mm <br />0.008 m <br /> (1.3 cm13 mm <br />0.013 m <br />) +
black +  and redbrown +
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 +
stellate-pubescent +  and piloso-hirsute +
winged +  and beaked +
dispersed +
Disturbed sites (sandy or gravelly soils, fields, lawns, roadsides) +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
hemispheric;obconic +
0.75 cm7.5 mm <br />0.0075 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
dentate +, denticulate +  and entire +
2-carpellate +
persistent +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
stellate-pubescent +  and piloso-hirsute +
not inflated +
Flowering May–Aug. +
connate +  and distinct +
20 +  and 34 +
subequal +  and unequal +
flat;convex +
exalbuminous +
Introduced +
scapiform +
appendaged +  and truncate +
papillate +
Hieracium pilosella var. niveum +  and Pilosella officinarum +
Hieracium pilosella +
Hieracium +
species +
5 cm50 mm <br />0.05 m <br /> (20 cm200 mm <br />0.2 m <br />) +
20 cm200 mm <br />0.2 m <br /> (150 cm1,500 mm <br />1.5 m <br />) +