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Cirsium ochrocentrum A. Gray. Yellow-spine Thistle. Phen: Jul-Aug (-Sep). Hab: Dry, gravelly or sandy soils of prairies, pastures, open disturbed areas. Dist: SD, WY, NV, and OR south to ec. TX, w. TX, NM, AZ, and n. Mexico (BCN, CHH, COA, DGO, SON, ZAC).

Origin/Endemic status: Native

Taxonomy Comments: With the elevation of the non-typic variety of Cirsium ochrocentrum to species rank (Nesom 2021i), our taxon returns to specific rank.

Synonymy: = Nesom (2021i); = Cirsium ochrocentrum A.Gray var. ochrocentrum – FNA19, K3, K4; < Cirsium ochrocentrum A.Gray – GrPl, Mex, NcTx, Ok

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Heliophily: 9

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