Hawaiian branch of the Begonia family

The In Defense of Plants blog has a great article posted about the Hawaiian endemic member of the Begonia family, Hillebrandia sandwicensis, which except for this one exception, are species of Begonia.  TPP just saw this plant for the first time a few weeks ago on our late Jan. early Feb. vacation.  No question it's a member of the family, and never would have even questioned it if told it was another species of Begonia.  Also worth clicking over to see the excellent image of the "male" and "female" flowers where generally the stigmas mimic the stamens fooling pollinators but providing no reward.  Unfortunately the plants TPP observed had no flowers. Didn't they know who was there?
The feed from the IDOP blog is on TPP's side bar, but wanted to call this post from a couple of days ago to your attention.

Friday Fabulous Flower - Begonia

Well, a Begonia isn't very exotic, so it always comes as a surprise that so many people don't notice what they are looking at.  Yes, flowers.  But Begonia is a monoecious plant.  Mono = one, ecious = house, so this means the plants usually, but not always, have both male and female (and yes, this is technically wrong) on the same plant (one house).  What tricks people is what tricks pollinators too.  The only obvious reward is pollen, and male flowers (center) have a cluster of yellow stamens that are pretty obvious against the light background of the perianth.  But only one of these flowers has stamens.  The others have a conspicuous yellow stigma presenting a very similar image.  If pollen is the only reward, then the non-rewarding female flowers cruelly deceive the pollinators by mimicking the rewarding male flowers.  This is called food-deception automimicry.  The flowers are different in another very obvious way that many people also fail to notice; the females flowers have a prominent winged ovary below the perianth, and a similar structure is completely lacking on the male flowers.  The ovary is sort of petalloid, and that may be the reason people don't notice.  Since the summer is here, apply this lesson to your cucumbers and squashes.