Hieracium longipilum |
Hieracium venosum |
|
---|---|---|
hairy hawkweed, longbeard hawkweed |
rattlesnake hawkweed, rattlesnake weed |
|
Habit | Plants 30–75(–200) cm. | Plants ca. 45 cm. |
Stems | proximally piloso-hirsute (hairs 6–15+ mm), distally piloso-hirsute (hairs 3–10+ mm), sometimes stellate-pubescent as well. |
proximally piloso-hirsute (hairs 1–3+ mm) to glabrate, distally usually glabrous, rarely piloso-hirsute. |
Leaves | basal 3–8+, cauline (3–)6–12+; blades oblanceolate, 45–80(–250+) × 12–30(–40+) mm, lengths 4–7+ times widths, bases cuneate, margins entire, apices rounded to acute, faces piloso-hirsute (hairs 3–8+ mm). |
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). |
Peduncles | stellate-pubescent and stipitate-glandular, sometimes piloso-hirsute as well. |
usually stipitate-glandular, rarely glabrous or glabrate. |
Involucres | campanulate, 6–8(–10) mm. |
obconic to campanulate, 7–9 mm. |
Florets | 30–40(–60); corollas yellow, ca. 7 mm. |
30–45+; corollas yellow (sometimes pale), 7–11 mm. |
Phyllaries | 12–21+, apices acuminate, abaxial faces stellate-pubescent and stipitate-glandular. |
12–13+, apices acute, abaxial faces usually stellate-pubescent and stipitate-glandular, rarely glabrous. |
Calyculi | bractlets 9–13+. |
bractlets 6–10+. |
Heads | 10–20+ in paniculiform to nearly racemiform arrays. |
4–10(–20+) in corymbiform to paniculiform arrays. |
Cypselae | urceolate, 3–4+ mm; pappi of 35–40+, stramineous to sordid bristles in 2+ series, 5.5–6.5 mm. |
(usually black, sometimes red-brown) columnar, 3–4 mm; pappi of ca. 50+, stramineous bristles in ± 2 series, 4–5 mm. |
Hieracium longipilum |
Hieracium venosum |
|
Phenology | Flowering Jul–Sep. | Flowering (Apr–)May–Jul(–Sep). |
Habitat | Fields, prairies, roadsides | Openings in forests, sandy hillsides |
Elevation | 100–400 m (300–1300 ft) | 10–300 m (0–1000 ft) |
Distribution |
AR; IA; IL; IN; KS; KY; LA; MI; MN; MO; NE; OH; OK; TN; TX; WI; ON
|
AL; CT; DC; DE; GA; IL; IN; KY; MA; MD; ME; MI; MO; MS; NC; NH; NJ; NY; OH; OK; PA; RI; SC; TN; VA; VT; WV; ON
|
Discussion | Hieracium longipilum may be no longer present in Quebec. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
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). (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 19, p. 285. | FNA vol. 19, p. 292. |
Parent taxa | Asteraceae > tribe Cichorieae > Hieracium | Asteraceae > tribe Cichorieae > Hieracium |
Sibling taxa | ||
Synonyms | H. venosum var. nudicaule | |
Name authority | Torrey ex Hooker: Fl. Bor.-Amer. 1: 298. (1833) | Linnaeus: Sp. Pl. 2: 800. (1753) |
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