4. Crepis tectorum Linnaeus, Sp. Pl. 2: 807. 1753.
屋根草 wu gen cao
Hieracioides tectorum (Linnaeus) Kuntze.
Herbs 30-90 cm tall, annual or biennial, ± rosulate, with taproot. Stem usually solitary, erect, branched from base or middle, subglabrous to arachnoid pubescent, sparsely glandular and with white bristles, leafy. Basal and lower stem leaves linear-lanceolate, lanceolate, or oblanceolate and attenuate into a winged petiole-like basal portion, 5-15 × 0.5-1 cm, undivided or more rarely sinuate to pinnatisect, subglabrous to pubescent with glandular and simple hairs, base cuneate-attenuate, margin sparsely dentate, apex acute; lobes (if present) lanceolate to linear. Middle stem leaves similar to lower stem leaves but usually undivided and rather without a petiole-like basal portion, base ± sagittately clasping. Upper stem leaves linear-lanceolate to linear, margin entire and revolute; uppermost stem leaves bractlike. Synflorescence corymbiform to corymbosely paniculiform, with some to many capitula. Capitula with 30-70 florets. Involucre narrowly cylindric to narrowly campanulate, 7.5-8.5 × 5-7 mm in fruit. Phyllaries abaxially with sparse arachnoid and stipitate glandular hairs; outer phyllaries linear, longest 1/3-1/2 as long as inner ones, apex acute; inner phyllaries adaxially appressed hairy, margin white scarious, apex acute. Anther tube 2.5-3 mm. Achene dark or purplish brown, fusiform, 3-4 mm, with 10 ribs, apically contracted. Pappus white, ca. 4 mm. Fl. and fr. Jul-Oct. 2n = 8.
Forest margins, grasslands in valleys, fields, wastelands; 900-1800 m. Heilongjiang, Nei Mongol, Xinjiang [Kazakhstan, Mongolia, Russia; Europe].