Hieracium venosum

Linnaeus

Sp. Pl. 2: 800. 1753.

Endemic
Synonyms: Hieracium venosum var. nudicaule (Michaux) Farwell
Treatment appears in FNA Volume 19. Treatment on page 292. Mentioned on page 282, 283, 287, 293.
Revision as of 19:16, 29 July 2020 by imported>Volume Importer
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Plants ca. 45 cm. Stems proximally piloso-hirsute (hairs 1–3+ mm) to glabrate, distally usually glabrous, rarely piloso-hirsute. Leaves: basal 3–6+, cauline 0–1+; blades obovate or elliptic to oblanceolate, 40–60 (–120) × 15–35 (–50+) mm, lengths 2–3 (–4) times widths, bases cuneate, margins usually entire, sometimes denticulate, apices rounded to acute, abaxial faces piloso-hirsute (hairs 2–5 mm) and stellate-pubescent, adaxial glabrous or piloso-hirsute (mostly near margins, hairs 2–3 mm). Heads 4–10 (–20+) in corymbiform to paniculiform arrays. Peduncles usually stipitate-glandular, rarely glabrous or glabrate. Calyculi: bractlets 6–10+. Involucres obconic to campanulate, 7–9 mm. Phyllaries 12–13+, apices acute, abaxial faces usually stellate-pubescent and stipitate-glandular, rarely glabrous. Florets 30–45+; corollas yellow (sometimes pale), 7–11 mm. Cypselae (usually black, sometimes redbrown) columnar, 3–4 mm; pappi of ca. 50+, stramineous bristles in ± 2 series, 4–5 mm.


Phenology: Flowering (Apr–)May–Jul(–Sep).
Habitat: Openings in forests, sandy hillsides
Elevation: 10–300 m

Distribution

V19-419-distribution-map.gif

Ont., Ala., Conn., Del., D.C., Ga., Ill., Ind., Ky., Maine, Md., Mass., Mich., Miss., Mo., N.H., N.J., N.Y., N.C., Ohio, Okla., Pa., R.I., S.C., Tenn., Vt., Va., W.Va.

Discussion

Plants of Hieracium venosum with adaxial faces of leaf blades glabrous have been called var. nudicaule.

The type of Hieracium marianum Willdenow may have resulted from a cross between plants of H. venosum and H. gronovii or H. scabrum (M. L. Fernald 1943c).

Selected References

None.

Lower Taxa

None.

"fine" is not a number.

... more about "Hieracium venosum"
glabrous +, stipitate-glandular +, stellate-pubescent +  and piloso-hirsute +
piloso-hirsute +  and glabrous +
acute;rounded;acute +
scarious +
ovate +  and lanceolate +
corymbiform +  and paniculiform +
indeterminate +  and determinate +
John L. Strother +
Linnaeus +
cuneate +
compound +  and simple +
6 cm60 mm <br />0.06 m <br /> (12 cm120 mm <br />0.12 m <br />) +
3.5 cm35 mm <br />0.035 m <br /> (5 cm50 mm <br />0.05 m <br />) +
4 cm40 mm <br />0.04 m <br /> (6 cm60 mm <br />0.06 m <br />) +
elliptic;oblanceolate +
1.5 cm15 mm <br />0.015 m <br /> (3.5 cm35 mm <br />0.035 m <br />) +
tuberculate +, rugose +, muricate +  and smooth +
deltate;lanceolate or linear +
filiform +
0 (?) +  and 1 (?) +
zygomorphic +, actinomorphic +  and (3-)5-merous +
0.7 cm7 mm <br />0.007 m <br /> (1.1 cm11 mm <br />0.011 m <br />) +
black +  and redbrown +
Ont. +, Ala. +, Conn. +, Del. +, D.C. +, Ga. +, Ill. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Miss. +, Mo. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Okla. +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +  and W.Va. +
10–300 m +
winged +  and beaked +
dispersed +
Openings in forests, sandy hillsides +
in corymbiform , paniculiform , thyrsiform , umbelliform or nearly racemiform , arrays +  and singly +
indeterminate +
each +  and sessile +
0.3 cm3 mm <br />0.003 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
obconic;campanulate +
0.7 cm7 mm <br />0.007 m <br /> (0.9 cm9 mm <br />0.009 m <br />) +
sessile +  and petiolate +
cauline +  and basal +
denticulate +
2-carpellate +
persistent +
0.4 cm4 mm <br />0.004 m <br /> (0.5 cm5 mm <br />0.005 m <br />) +
glabrate +, glabrous +  and stipitate-glandular +
not inflated +
Flowering (Apr–)May–Jul(–Sep). +
connate +  and distinct +
12 +  and 13 +
subequal +  and unequal +
flat;convex +
exalbuminous +
piloso-hirsute +, glabrous +, proximally piloso-hirsute +  and glabrate +
scapiform +
appendaged +  and truncate +
papillate +
Hieracium venosum var. nudicaule +
Hieracium venosum +
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 />) +