Petiolar Anatomy of North American Astragalus Species ( Fabaceae ) with Persistent Petioles


The petiole and rachis anatomy of II North American Astragalus species that show a tendency towards persistent petioles is described and illustrated by line drawings of representative transections. The results are compared with those of a spine anatomical survey of 200 Old World Astragalus and Astracantha species. Attention was given to the anatomical… (More)

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