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... more about "Cirsium engelmannii"
David J. Keil +
Rydberg +
Cirsium virginianum var. filipendulum +
Blackland or Engelmann’s thistle +
La. +, Okla. +  and Tex. +
50–200 m +
Tallgrass prairies, old fields, roadsides, oak savannas, forest edges, in calcareous clay or rarely sandy soils +
Flowering spring–summer (May–Jul). +
Fl. Rocky Mts., +
Cirsium terrae-nigrae +
Cirsium engelmannii +
species +