. Range-wide status assessment of cirsium longistylum (long-styled thistle) . Cirsium longistylum; Cirsium; Long-styled thistle; Endemic plants; Rare plants. Figure 2. Putative hybrid between C. longistylum and C. hookerianum in the Dry Range. Note the slightly widened involucral bracts. 3. Similar Species: Cirsium hookerianum and C. scariosum are both similar to C longistylum in terms of their overall morphology and biology. In addition, the geographic distribution and habitats of the species overlap. C. hookerianum can be distinguished by its long-tapering involucral bracts that are not frin
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. Range-wide status assessment of cirsium longistylum (long-styled thistle) . Cirsium longistylum; Cirsium; Long-styled thistle; Endemic plants; Rare plants. Figure 2. Putative hybrid between C. longistylum and C. hookerianum in the Dry Range. Note the slightly widened involucral bracts. 3. Similar Species: Cirsium hookerianum and C. scariosum are both similar to C longistylum in terms of their overall morphology and biology. In addition, the geographic distribution and habitats of the species overlap. C. hookerianum can be distinguished by its long-tapering involucral bracts that are not fringed and dilated near the apex. Specimens of C scariosum may be confused with Figure 1. Cirsium longistylum flower head. Note the widened and fringed involucral bracts.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Mincemoyer, Scott; Montana Natural Heritage Program. Helena : Montana Natural Heritage Program