“…To test ecological and evolutionary hypotheses, such as transitions in pollination systems, a number of workers have advocated using a phylogenetic approach based on cladistic analysis (e.g., Ridley, 1983;Wanntorp, 1983;Coddington, 1988;Funk and Brooks, 1990;Harvey and Pagel, 1991;Brooks and McLennan, 1991). The direction of change and evolutionary shifts in plant breeding and pol-54 lination systems have been examined from a phylogenetic perspective in a number of recent studies (e.g., Wyatt, 1983Wyatt, , 1984Wyatt, , 1988Hart, 1985;Eckenwalder and Barrett, 1986;Donoghue, 1989;Olmstead, 1989Olmstead, , 1992Sytsma, Smith, and Berry, 1991;Armbruster, 1992Armbruster, , 1993McDade, 1992;Rieseberg, Hanson, and Philbrick, 1992;Lavin, 1993;Crisp, 1994;Graham and Barrett, 1995;Luckow and Hopkins, 1995;Weller, Wagner, and Sakai, 1995). Following this approach, I use results of a cladistic analysis of the genus Erythrina L. (Leguminosae: Phaseoleae) to study evolutionary shifts between passerine and hummingbird pollination systems in the genus, and to assess the homology of characters traditionally associated with these ornithophilous syndromes.…”