Crepis capillaris
Crepis atribarba
crépis capillaire, smooth hawk's-beard
dark hawksbeard, slender hawksbeard
1(–6+), erect to ± procumbent, usually simple (usually with single stout leader, sometimes multiple with slender laterals), hispid proximally or throughout.
1–2, erect, slender, usually branched distal to middles, glabrous or tomentulose.
basal and cauline;
petiolate (petiole bases clasping);
blades lanceolate or oblanceolate, runcinate or lyrate, 5–30 × 1–4.5 cm, margins pinnately divided to sharply dentate (lobes remote, unequal), apices obtuse or acute, mucronate, faces glabrous or sparsely hispid (hairs yellow; proximal cauline auriculate and clasping).
basal and cauline;
petiolate;
blades lanceolate to linear, 10–35 × 0.5–6 cm, margins deeply pinnately lobed (lobes narrowly lanceolate or linear, usually entire or toothed), apices acuminate, faces tomentulose to glabrate.
cylindric to turbinate, 5–8 × 3–6 mm.
cylindro-campanulate, 10–12 × 4–7 mm.
20–60;
corollas deep yellow (reddish abaxially), 8–12 mm (hairy).
6–35;
corollas yellow, 10–18 mm.
8–16, lanceolate, 6–7 mm (margins scarious), apices acute, abaxial faces stipitate-glandular and glandular setose (setae black, usually in 2 rows), adaxial glabrous.
8–13, lanceolate, 10–12 mm (margins yellow, scarious, eciliate), apices acute, abaxial faces usually tomentulose, sometimes glabrous, often with coarse, green or blackish setae, adaxial glabrous or with fine, appressed hairs.
of 8, linear, tomentulose or stipitate-glandular bractlets 2–4 mm.
of 5–10, narrowly triangular to lanceolate, tomentose bractlets 1–3 mm.
10–15(–30+), in corymbiform arrays.
3–30, in corymbiform arrays.
brownish yellow, fusiform, 1.5–2.5 mm, apices narrowed (not beaked), ribs 10 (glabrous or scabrous);
pappi white (fluffy), 3–4 mm (scarcely surpassing phyllaries).
dark or blackish green, subcylindric, 3–10 mm, apices tapered, not beaked, ribs 12–15 (distinct);
pappi whitish, 5–9 mm.
= 6.
= 22, 33, 44, 55, 88.
Crepis capillaris
Crepis atribarba
Crepis capillaris is recognized by its shallow root system, dense rosettes of coarsely dentate or pinnately lobed leaves, erect slender stems, auriculate-based cauline leaves, relatively small heads, phyllaries with double rows of black setae, and fluffy white pappi. It is weedy and can become a serious lawn pest. It is one of only three species of Crepis with 2n = 6; E. B. Babcock (1947) considered it to be advanced in the genus.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
Crepis atribarba is generally recognized by the deeply pinnately lobed leaves with linear lobes, fine tomentulose indument on stems and leaves, setose phyllaries, and dark green, strongly ribbed cypselae. It is a variable mixture that includes polyploid, apomictic forms and hybrids with C. acuminata and other species. The typical form is recognized by its short stature, narrow pinnately lobed, tomentulose leaves, stems with 3–10 heads, and phyllaries with scattered, black, eglandular setae. Larger, more robust forms with stems 30–70 cm, 10–30+ heads, narrower involucres, and few or no black setae have been recognized as subsp. originalis. The latter was considered by E. B. Babcock (1947) to represent the original diploid form of the species; it is difficult to distinguish in practice.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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