Abstract
The structure of the pollen wall as revealed by transmission electron microscopy is presented for 29 speciesSenecio including 19 aureoid and ten non-aureoid species. The previous report of a helianthoid wall structure (exine with internal foramina) is confirmed for all the aureoid species examined while all of the non-aureoid taxa showed a senecioid pattern. The data provide support for the treatment of the aureoid complex as a distinct taxon.
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Bain, J.F., Walker, J. A comparison of the pollen wall ultrastructure of aureoid and non-aureoidSenecio species (Asteraceae) in North America. Pl Syst Evol 195, 199–207 (1995). https://doi.org/10.1007/BF00989296
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DOI: https://doi.org/10.1007/BF00989296