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I'm hoping to get the chance to see this plant again. What should I look for and/or measure to aid in its identification?
You need to observe the number of rows of bracts there is under the flower head and whether there are any hairs on them. Hawk's Beards tend to have an extra row of spreading bracts at the base of the involucre (which i think this has). Does the plant have stem leaves or not, and if so do they clasp the stem. Hawkbits and Cat's ears have leafless stems. And well Hawkweeds have different leaves altogether. Another thing to look at are the achenes, whether they are silky or feathery and whether there are scales between the florets. Most Crepis have a silky pappus and no scales. It looks like your diagnosis of a Crepis is well-founded, but which one is it??
Very tall plant (85cm high). Leaves pinnate and lobed, up to 10cm, hairy on both sides, with hairy ridge underneath. Main stem with hairy ridges. Flowerhead up to 4cm in width. Basal rosette of dandelion-type leaves.
Identification as Crepis biennis now confirmed by local expert.
Lat/Lng: 53.08, 8.81