线叶旋覆花 xian ye xuan fu hua

Inula britannica Linnaeus subsp. linariifolia (Turczaninow) Kitamura; I. britannica var. linariifolia (Turczaninow) Regel; I. britannica var. maximowiczii Regel; I. linariifolia var. intermedia Regel.

Herbs, perennial. Plants 30-80 cm tall; stems simple or branched, covered with white sparse multicellular appressed hairs. Leaves linear-lanceolate, acuminate, sparsely pilose abaxially, glabrous adaxially, margin entire or with fine rare denticles; lower leaves ca. 10 × 1 cm, petioles ca. 3 cm; upper leaves sessile, 6-10 × 0.5-1 cm; floral leaves 1-4 cm × 1.5-5 mm. Capitula 1-2.8 cm in diam., 5-25 in corymbiform synflorescences and borne on glandular-pubescent peduncles 0.6-3 cm. Involucre 1-1.3 cm in diam.; phyllaries straight, in 4 series, gland-dotted abaxially, sometimes outer ones unbent, acute, margin with golden, appressed, elliptic, sessile or shortly stalked glands, outer phyllaries lanceolate, 3-3.5 × ca. 0.8 mm, leathery at base, herbaceous, pilose adaxially, median membranous, 4-5 × ca. 0.6 mm, upper part sometimes reddish, inner linear, membranous, as long as median ones, ca. 0.3 mm wide, glabrous. Ray florets yellow, 0.7-1.2 cm, 2-3 × as long as phyllaries, covered outside with sparse golden glands, tube small, 2-2.5 mm, slightly shorter than pappus; lamina linear, 4-7.5 × ca. 0.8 mm, 3- or 4-veined and with 3 denticles above. Disk florets as long as pappus, yellow, with 5 acute glandular denticles at margin. Achenes brown, cylindric, longitudinally ribbed, 1-1.2 × 0.2-0.4 mm, pubescent with sparse appressed hairs. Pappus ca. 3 mm, with ca. 25 bristles. Fl. Jul-Aug, fr. Aug-Oct. 2n = 24.

Riverbanks, meadows, grassy slopes, waste fields; below 1800 m. Anhui, Hebei, Heilongjiang, Henan, Hubei, Jiangsu, Jiangxi, Jilin, Liaoning, Shaanxi, Shandong, Shanxi, Zhejiang [Japan, Korea, Mongolia, Russia].