Nectar Constituents in the Genus Fremontia (Sterculiaceae): Sugars, Flavonoids, and Proteins

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Abstract
Fremontia [F. californica and F. mexicana] nectar contains glucose and fructose as major sugars. Two isoflavonoids, 5,7-dimethoxygenistein and its 4''-glucoside, occur in the nectar and cause it to fluoresce bright blue. No free amino acids were identifiable, but proteins are present, and the parental protein patterns following electrophoresis are additive in the interspecific hybrid. Esterase and malate dehydrogenase isozymes were detectable.