Identification botanique des drogues végétales pulvérisée. Conyza canadensis (L) Cronq. (Erigeron canadensis L.)

Comparative investigation by SEM of the commercially avaible finely powdered drug from gelatin capsules said to contain Conyza canadensis flowering tops and the slightly broken and finely powdered drug from previously authenticated plant of the same specie showed that the most diagnostic characters ere the 3-colporoidate pollen grains with spinose exine, the pappus fragments ande the co-occurence of the twin smooth trichomes from the ovary and the warty trichomes from leaves and involucral bract