Crepis tectorum
annual hawksbeard, crépis des troits, narrow-leaf hawk's-beard, rooftop hawksbeard
1, erect (fistulose), branched distally or from bases, tomentulose and/or hispid.
basal and cauline; petiolate;
blades lanceolate to oblanceolate, often coarsely runcinate, 5–15 × 1–4 cm, margins entire, denticulate, or dentate to pinnately lobed (lobes remote, coarse, unequal), apices acute to acuminate, abaxial faces glabrous or tomentose, adaxial glabrous (proximal cauline sessile, bases auriculate, distal usually linear, entire).
cylindro-campanulate, 6–9 × 7–8 mm.
30–70;
corollas yellow (without red on ligules), 10–13 mm.
12–15, lanceolate, 5–9 mm, (bases becoming keeled and thickened, margins scarious), apices acute to attenuate (white-ciliate, tomentulose), abaxial faces tomentose to hispidulous, adaxial with fine, appressed hairs.
of ± 12, subulate, tomentose and hispidulous bractlets 2–5 mm (often becoming scarious).
5–20(–100+), in paniculiform or corymbiform arrays.
dark reddish or purplish brown, fusiform, 3–4 mm, apices constricted (not beaked), ribs 10 (rounded, minutely spiculate);
pappi white (fine, soft), 4–5 mm.
= 8.
Crepis tectorum
Crepis tectorum is recognized by its annual habit, keeled phyllaries with minute hairs on adaxial faces, and dark reddish or purplish brown cypselae. It is widespread, often abundant, occurs in a great variety of habitats, and is considered a noxious weed in some states.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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