Achnopogon

• Authority

  Carlquist, Sherwin. 1957. Anatomy of Guayana Mutisieae. Mem. New York Bot. Gard. 9 (3): 441-476.

• Family

  Asteraceae

• Scientific Name

  Achnopogon

• Discussion

  The corolla of the monotypic genus Achnopogon (fig. 115 A), like that of Duidaea, has a simplified venation. In the achene, the full complement of ten bundles is present, half of them continuing upwards into the corolla-tube. Stamen traces unite with the corolla-tube bundles in the achene top. In the style of Achnopogon (fig. 115 B), as in that of Duidaea tatei, four bundles are present, the lateral two uniting with the dorsiventral pair at various points along the length of the style. Rather than joining with exterior achene wall bundles, however, all four continue into the achene as interior bundles, (fig. 115 E). In the achene illustrated, one of the lateral interior bundles is double along part of its extent. At the base of the achene, the dorsiventral pair of interior bundles unites with nearby exterior bundles, while the lateral interior bundles and the ovule trace unite as a central plexus; this plexus joins, further down, with the single strand formed by the union of all of the exterior bundles.