Carduus x orthocephalus Wallr.
Family: Asteraceae
plumeless thistle
[Carduus acanthoides X C. nutans L.]
Carduus x orthocephalus image
Etymology: ortho = (Greek) straight, true, regular; cephalus = (Greek) head
Plants
: biennial/perennial forb
Conservation Status
: Introduced - adventive
(CARDUUS ACANTHOIDES L. X CARDUUS NUTANS L.) Plants pilose to cottony above, the leaves sparsely pilose at least on the lower midrib, deeply pinnatified, the lobes terminated by yellowish spines, the bases decurrent, forming wings immediately below the head on one peduncle (branch), but with wings absent below the other heads of the plant; heads somewhat clustered, the involucre ca. 2 cm high.

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

The PRWF description is based on Zimmerman 1879 from a Dane Co. pasture (T6N, R9E, S.3), Aug. 3, 1947 (WIS), the only Wisconsin collection (as of 1963).

Johnson, M.E. and H.H. Iltis. 1963. Preliminary reports on the flora of Wisconsin: No. 48. Compositae Family. Wisconsin Academy of Sciences, Arts & Letters. 52:255-342.

Other Treatments:  

USDA Plants

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