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Flora of Taiwan | Family List | Compositae | Conyza

Conyza japonica (Thunb.) Less., Syn. Compos. 204. 1832; Li, Fl. Taiwan 4: 838. 1978; Chen, Fl. Reipubl. Popul. Sin. 74: 342, pl. 85: figs. 4-6. 1985.

日本假蓬

Conyza japonica

Credit: HAST

  • Erigeron japonicum Thunb.

    Annual or biennial herbs. Stems erect, grayish green, 25-55 cm tall, striate, often branched in upper part, villous. Leaves green on upper surface, pale on lower surface, white villous on both surfaces, margins apiculate-crenate; radical and lower cauline leaves in rosettes, obovate to spatulate, apex obtuse or rounded, base attenuate to winged petiole, auriculate, 4-13 cm long, 1.5-4 cm wide, sessile; gradually reduced upward, becoming lanceolate to linear-lanceolate. Heads globose, 4-5 mm long, 6-8 mm across, numerous, in terminal glomerules or tight corymbs; peduncle slender, 3-10 mm long, villous. Involucre hemispheric, 5-6 mm long, bracts in 2 or 3 series, scarious, imbricate, lanceolate, acute, purplish at apex, sparsely pubescent, outer bracts shorter, 3-3.5 mm long, inner bracts 4-5 mm long. Receptacle hemispheric, fimbriate. Ray florets numerous, corolla filiform, yellow, 1.5 mm long, ciliate; style 3 mm long, prominent, red-purple, nearly equalling pappus. Disc florets ca. 15, corolla funnelform, upper part ca. 1.2 mm long, lower ca. 2.5 mm long, 5-lobed, lobes ovate, red-purple, each lobe with 2 or 3 hairs. Achenes pale brown, obovate, flattened, ca. 0.8 mm long, ca. 0.3 mm wide, minutely puberulous. Pappus bristels white, slightly reddish, in one row, capillary, subequal, 4-6 mm long at maturity, deciduous. Flowering year round in Taiwan. Chromosome number, 2n = 18 (Peng & Hsu, 1978).

    TAIPEI: Shihting, Peng 10610. TAOYUAN: Paling, Peng 11011. TAICHUNG: Wuling, Peng 12092; Kukuan, Peng 12429. NANTOU: Wushe, Peng 10355; Hsini, Peng 11401. CHIAYI: Fanlu, Peng 10062; Tungputo Chuchung, Hsu 7417. HUALIEN: Errtzeshan, Peng 5881; Taroko to Tienhsiang, Peng 12640. TAITUNG: Hsianyang, Peng 11859.

    Afghanistan, India, Thailand, Burma, Malaysia, mainland China, the Ryukyus and Japan. Taiwan, common from low elevations to ca. 2,000 m.


     

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