Appendix 2. Bract types definitions 



1 - Cirsium longistylum form, recorded as "1", with apically 

 widened, flared, lacerate-margined, tapering bracts, often with a 

 sharp bend and overall curvature 



hy - Intermediate Cirsium lonqistvlum x C. hookerianum forms, 

 tentatively categorized as hybrids, and recorded as "lx", "x", or 

 "hx" , with one of the following sets of features: 



lx - Cirsium longistylum C. hookerianum . Apically 

 slightly widened involucral bracts with highly lacerate or 

 erose margins. 



x - Cirsium longistylum C. hookerianum . Apically non- 

 widened involucral bracts with lacerate or erose margins. 

 Variable in conspicuousness of midvein. 



hx - Cirsium hookerianum C. lonqistvlum . Apically non- 

 widened bracts with slightly lacerate or erose margins. 



h - Cirsium hookerianum form, recorded as "h", with narrow width, 

 straight-edged outline and no apical widening, with entire non- 

 hyaline margin 



Variables: 



Geniculate curvature of bract; most often associated with C. 

 longistylum form 



Conspicuousness of bract midvein; most often associated with C. 

 hookerianum form 



Variable bract forms on the same flower head: the C longistylum 

 form bracts are lowermost on the involucre when not found 

 throughout. 



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