Northeastern Asian Flora
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Cirsium yezoense (Maxim.) Makino   (redirected from: Cirsium riparium (Koidz.) Koidz.)
Family: Asteraceae
[Cirsium maximowiczii var. riparium Koidz., moreCirsium riparium (Koidz.) Koidz., Cirsium yoshizawae Koidz., Cnicus yezoensis Maxim.]
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  • Japan Flora
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Japan Flora: Stems 1-2 (-3) m. long, cobwebby, branched, leafy; radical leaves thin, large, broadly elliptic, 50- 60 cm. long, about 30 cm. wide, pinatifid, the lobes of about 5 pairs, lanceolate-elliptic, irregularly toothed, short spine­tipped, glaucous and mealy-puberulent above, glabrous be­neath; cauline leaves gradually smaller, lanceolate to broadly elliptic, pinnatifid; heads solitary on the branches, nodding, usually subtended by few bracteal leaves; involucres depressed- globose, 25-2.7 cm. long, 4-4.5 cm. wide; bracts thin, flat, cob­webby, about 7-seriate, the outer lanceolate, obliquely spread­ing, the median nearly unarmed; corollas reddish, 18-21 mm. long; achenes 3-4 mm. long. Sept-Oct. Woods.

Hok­kaido (s. distr.), Honshu (Kinki Distr. and northw.).

Cirsium yezoense
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Development supported by College of Agriculture and Life Sciences of Seoul
National University and Korea National Arboretum of Korea Forest Service.
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