Oh yes, John is entirely correct and that is the criterion I use. If a flower bract looks intermediate I just leave them at the genus level. careyana is also more common in lowlands and further south but there is overlap in range.
Also apparently B. careyana often apparently has leaves that feel like very fine sandpaper and B. sagittata leaves are soft.
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I remember we discussed differences between B. sagittata and B. careyana - I think B. sagittata involucre was woolier as in the photo:
https://burkeherbarium.org/imagecollection/photo.php?Photo=wtu122667&Taxon=Balsamorhiza%20sagittata&SourcePage=taxon
Oh yes, John is entirely correct and that is the criterion I use. If a flower bract looks intermediate I just leave them at the genus level. careyana is also more common in lowlands and further south but there is overlap in range.
Also apparently B. careyana often apparently has leaves that feel like very fine sandpaper and B. sagittata leaves are soft.
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