Sesbania sect. Glottidium (Desvaux) Lavin, Syst. Bot. Monogr.

Sesbania sect. Glottidium (Desvaux) Lavin, Syst. Bot. Monogr. 45: 44. 1995. Glottidium Desvaux, J. Bot. Agric. 1: 119. 1813. TYPE: Sesbania vesicaria (Jacquin) Elliott.

Although strongly resolved as New World sister clades, sect. Glottidium is maintained as distinct from sect. Daubentonia (DC.) Bentham because of the large genetic ( Fig. 5 View FIG ) and morphological differences that separate Glottidium from Daubentonia. The morphological differences include an annual growth habit and auricle along the upper margin of the keel petals, albeit inconspicuous, which are pleisomorphic traits shared by Glottidium and the Pantropical clade. Differences also pertain mostly to the inflated pod of Glottidium, which contains two seeds that are together enclosed inside an endodermal sac that has abscised from the other dermal layers of the fruit wall, compared to the typical 4-winged, several-seeded sect. Daubentonia. Whereas Daubentonia is mostly neotropical in distribution, Glottidium occurs in temperate southeastern U.S.A.