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The term capitulum can refer to several things:
a type of flower head where the bracts are located under the basis, such as a daisy's
the top of a Sphagnum moss plant with compact clusters of young branches. Put up more for my benefit, and I do agree, there are hair just about visible.
An iSpot Project- HELP WITH IDS - UK & Ireland Community - PLANTS
...shows no records for Conyza sumatrensis in VC53, very interesting..!!
... that the phyllaries of Conyza canadensis are glabrous to sparsely hairy.
... shows 8 records of Conyza sumatrensis in Lincolnshire. (On the other hand your Nonea lutea could be a county first record.)
In my limited experience, Conyza sumatrensis is much more downy and not as pale.
Canadian Fleabane (Conyza canadensis) it is..?
Thanks to all for the debate.
Lat/Lng: 53.2, -0.6
OS grid ref: SK9568