Hieracium venosum
rattlesnake hawkweed, rattlesnake weed
proximally piloso-hirsute (hairs 1–3+ mm) to glabrate, distally usually glabrous, rarely piloso-hirsute.
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).
usually stipitate-glandular, rarely glabrous or glabrate.
obconic to campanulate, 7–9 mm.
30–45+;
corollas yellow (sometimes pale), 7–11 mm.
12–13+, apices acute, abaxial faces usually stellate-pubescent and stipitate-glandular, rarely glabrous.
bractlets 6–10+.
4–10(–20+) in corymbiform to paniculiform arrays.
(usually black, sometimes red-brown) columnar, 3–4 mm;
pappi of ca. 50+, stramineous bristles in ± 2 series, 4–5 mm.
Hieracium venosum
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.)
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