...unquestionably Zenaida andZenaidura can not be separated generically, since the former is inevery way exactly intermediate between the two groups... 
Robert L. Merz 「Jaw Musculature of the Mourning and White-winged Doves」
...This plant appears to be generically distinct from Erigeron,particularly in its stipitate pappus...
Charles Sturt 「Expedition into Central Australia」
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