<abstract xmlns="http://www.w3.org/1999/xhtml">

Six perennial Macaronesian species are recognized in <italic>Bubonium</italic> J. Hill emend. Briq.: the Cape Verdian <italic>B. daltonii</italic> (Webb) T. Halvorsen, with two subspecies, ssp. <italic>daltonii</italic> and ssp. <italic>vogelii</italic> (Webb) T. Halvorsen, and <italic>B. smithii</italic> (Webb) T. Halvorsen; and the Canarian <italic>B. intermedium</italic> (DC.) T. Halvorsen &amp; Wikl., <italic>B. graveolens</italic> (Forssk.) Maire, with two subspecies, ssp. <italic>odorum</italic> (Schousb.) Wikl. and ssp. <italic>stenophyllum</italic> (Link) T. Halvorsen, <italic>B. schultzii</italic> (Balle) Sventenius and <italic>B. sericeum</italic> (L.f.) T. Halvorsen &amp; Wikl. Four Mediterranean annuals are superficially treated for Macaronesia: <italic>B. aquaticum</italic> (L.) Hill, <italic>Asteriscus maritimus</italic> (L.) Less., <italic>A. hierochunticus</italic> (Michon) Wikl., and <italic>A. spinosus</italic> (L.) Sch. Bip. A key to the Macaronesian <italic>Bubonium</italic> species is provided. The chromosome number n=7 is reported for all the <italic>Bubonium</italic> species in Macaronesia; in <italic>B. graveolens</italic> ssp. <italic>odorum, B. daltonii</italic> ssp. <italic>vogelii,</italic> and <italic>B. smithii</italic> for the first time. The chromosome number n=6 is confirmed for <italic>Asteriscus maritimus.</italic> The self fertile annuals are not cross compatible with the other species. Among the predominantly self incompatible perennials internal barriers to gene exchange are weak. Only <italic>B. schultzii</italic> seems genetically isolated. Between the other perennials the crossability is complete and hybrid fertility high between species from the same archipelago, but reduced between species from different archipelagos. The present occurrence of the Canarian species <italic>B. sericeum</italic> and <italic>B. intermedium</italic> and the Cape Verdean <italic>B. daltonii</italic> and <italic>B. smithii</italic> seems relict. These frutescent endemics probably belong to an old element in the Macaronesian flora.
</abstract>

The perennial Macaronesian species of Bubonium (Compositae - Inuleae).

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The perennial Macaronesian species of Bubonium (Compositae - Inuleae).

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