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From Plant Press, Vol. 8, No. 1 from January 2005.
The genus Stramentopappus was described by Robinson and Funk (Bot. Jahrb. Systematic 108: 213-228. 1987) based on its lack of a sclerified pappus base and the reduction of the outer ring of callus. The genus has the unusual chromosome number of n = 19 (most new world Vernonieae have chromosome counts of n = 17). This count was later found to be present in the two most closely related genera Leoboldia and Lepidonia.
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