Hieracium caespitosum

Dumortier

Fl. Belg., 62. 1827.

IntroducedIllustrated
Synonyms: Hieracium pratense Tausch Pilosella caespitosa (Dumortier) P. D. Sell & C. West
Treatment appears in FNA Volume 19. Treatment on page 284. Mentioned on page 280.

Plants 20–75 cm. Stems proximally piloso-hirsute (hairs 1–3+ mm) and stipitate-glandular, sometimes stellate-pubescent as well, distally piloso-hirsute (hairs 1–4+ mm), stellate-pubescent, and stipitate-glandular. Leaves: basal 3–8+, cauline 0–2(–5+); blades oblanceolate to lanceolate, 35–120(–180+) × 12–20+ mm, lengths 2–6(–10+) times widths, bases cuneate, margins entire or denticulate, apices rounded to acute, faces usually piloso-hirsute (hairs 1–3+ mm) and stellate-pubescent, sometimes glabrate. Heads 5–25+ in ± umbelliform or congested, corymbiform arrays. Peduncles piloso-hirsute (hairs 1–2.5 mm), stellate-pubescent, and stipitate-glandular. Calyculi: bractlets 5–8+. Involucres campanulate, 7.5–9 mm. Phyllaries 12–18+, apices acute to acuminate, abaxial faces piloso-hirsute (hairs 1–2.5+), stellate-pubescent, and stipitate-glandular. Florets 25–50+; corollas yellow, 8–12+ mm. Cypselae columnar, 1.5–1.8 mm; pappi of 25–30+, white bristles in 1 series, 4–5(–6) mm.


Phenology: Flowering May–Jul(–Aug).
Habitat: Disturbed sites, stream sides
Elevation: 10–300(–1500) m

Distribution

V19-392-distribution-map.gif

Introduced; B.C., Man., N.B., Nfld. and Labr. (Nfld.), N.S., Ont., P.E.I., Que., Conn., Del., D.C., Ga., Idaho, Ill., Ind., Ky., Maine, Md., Mass., Mich., Minn., Mont., N.H., N.J., N.Y., N.C., Ohio, Pa., R.I., S.C., Tenn., Vt., Va., Wash., W.Va., Wis., Wyo., Europe.

Discussion

The type of Hieracium floribundum Wimmer & Grabowski probably resulted from a cross between plants of H. caespitosum and H. lactucella (P. D. Sell and C. West 1976).

Selected References

None.

Lower Taxa

None.
... more about "Hieracium caespitosum"
John L. Strother +
Dumortier +
B.C. +, Man. +, N.B. +, Nfld. and Labr. (Nfld.) +, N.S. +, Ont. +, P.E.I. +, Que. +, Conn. +, Del. +, D.C. +, Ga. +, Idaho +, Ill. +, Ind. +, Ky. +, Maine +, Md. +, Mass. +, Mich. +, Minn. +, Mont. +, N.H. +, N.J. +, N.Y. +, N.C. +, Ohio +, Pa. +, R.I. +, S.C. +, Tenn. +, Vt. +, Va. +, Wash. +, W.Va. +, Wis. +, Wyo. +  and Europe. +
10–300(–1500) m +
Disturbed sites, stream sides +
Flowering May–Jul(–Aug). +
Introduced +  and Illustrated +
Hieracium pratense +  and Pilosella caespitosa +
Hieracium caespitosum +
Hieracium +
species +