Abstract
To help clarify relationships within the Limnanthaceae, all 19 taxa were compared on the basis of flavonoids occurring in all tissues, and 14 of these taxa were additionally compared on the basis of flavonoids occurring only in the petals. Of the 46 flavonol glycosides encountered, 35 were identified as derivatives of six flavonol aglycone types: syringetin, isorhamnetin, kaempferol, laricytrin (myricetin 3'-methyl ether), quercetin and myricetin, all glycosylated with combinations of glucose and rhamnose. Varimax Factor Analysis with rotation of the flavonoid data indicated that the family probably contains 3 phyletic lines, an observation inconsistent with the conventional 2-generic interpretation of the family. Mason's sectional treatment of Limnanthes is supported by petal flavonoid results, but not by whole-plant flavonoid results, indicating that petal flavonoids more clearly reflect natural relationships in Limnanthes. Evolution of whole-plant flavonoids of Limnanthes appears to be partly linked to changes in breeding system.
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