Crepis vesicaria
Crepis bursifolia
beak hawk's-beard, weedy hawksbeard
Italian hawksbeard, Italian hawksbit
1, erect to arcuate or decumbent (green or purple proximally), usually much branched, glabrate to hispid and/or tomentose, sometimes sparsely setose (setae black).
2–9+, arcuate or decumbent, slender, scapiform, cymosely branched distally, glabrous.
basal and cauline;
petiolate (bases clasping);
blades oblanceolate to ovate, often runcinate, 10–35 × 2–8 cm, margins pinnately lobed to toothed (terminal lobes relatively large), apices obtuse or acute, faces usually hirsute (hairs sometimes only on veins) or glabrous (cauline sessile, bases auriculate, clasping, margins ± toothed).
mostly basal;
petiolate;
blades oblanceolate, lyrate, 2.5–25 × 0.5–6 cm, margins pinnately lobed (lateral lobes lanceolate, dentate, acute, terminal lobes usually larger), apices obtuse or acute, faces glabrous.
cylindro-campanulate (becoming turbinate or urceolate in fruit), 5–14 × 5–6 mm.
cylindric, 8–11 × 3–4 mm.
50–70;
corollas yellow (reddish abaxially), 6–15 mm.
30–60;
corollas light yellow, greenish abaxially, 10–11 mm.
7–16, (reflexed at maturity) lanceolate, 10–12 mm, (margins green to yellowish), apices obtuse or acute (ciliate), abaxial faces tomentose and often stipitate-glandular, adaxial with fine, appressed hairs.
10–12 (reflexed, medially yellowish) lanceolate (bases keeled, margins dark greenish, sometimes scarious), apices acute (ciliate), abaxial faces tomentulose, adaxial with fine hairs.
of 5–12, ovate to linear-lanceolate, glabrous bractlets 3–4 mm (reflexed in fruit, scarious).
of 10–14, (lax) linear, tomentose or glandular-pubescent bractlets 2–5 mm.
10–20, in lax, corymbiform arrays.
2–3 (peduncles slender), in cymiform arrays.
(monomorphic or dimorphic) pale brown or yellowish, fusiform, 4–9 mm, outer wider with apices attenuate (not beaked), inner gradually tapered, beaked (beaks 2–5 mm, ± equal to bodies), ribs 10 (narrow);
pappi white (fine, soft), 3–6 mm.
pale brown, fusiform, 6–7 mm, beaked, beaks pale (lengths nearly 2 times bodies), ribs 10;
pappi white, 3–4 mm.
= 8, 16.
= 8.
Crepis vesicaria
Crepis bursifolia
Native to the Mediterranean region of western Europe, Crepis vesicaria is recognized by its annual or biennial habit, pinnately lobed leaves, reflexed calyculi, tomentose and glandular phyllaries, and slender, long-beaked inner cypselae. It is polymorphic; subspecies are recognized in Europe. E. B. Babcock (1947) identified the North American plants as subsp. taraxaciflora (Thuiller) Thellung, which some Europeans (T. G. Tutin et al. 1964–1980, vol. 4) have listed as a synonym of subsp. haenseleri (Boissier ex de Candolle) P. D. Sell.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Crepis bursifolia is identified by the dense basal rosettes of glabrous, lyrate leaves with dentate lateral lobes and relatively large terminal lobes, relatively few heads on slender peduncles, and cypselae with relatively thin beaks two times lengths of the bodies. It is an aggressive weed.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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