Another thank you to to Priscilla Burcher (aka PriscillaBurcher@Flickr) for sharing an image with Botany Photo of the Day (original image | submitted via the Botany Photo of the Day Flickr Pool). Much appreciated!
The shrubby Tibouchina heteromalla is endemic to Brazil, where it occurs in isolated or small scattered populations associated with rocky areas. Known commonly as silverleafed princess flower or glory bush, Tibouchina heteromalla is a popular ornamental plant. More on the species, including its pollination biology, can be discovered via Campos, C et al.. 2009. Floral biology and breeding mechanisms of Tibouchina heteromalla Cogn. in rocky outcrops in the South of Minas Gerais (PDF). Brazilian Journal of Ecology. Volume 8(?). The paper also makes note that the species is used in the recovery and reforestation of degraded areas.
Tibouchina is a member of the Melastomataceae, or the melastome family. This family consists of 188 recognized genera and just over 5000 recognized species, making it the eight largest vascular plant family currently. Most of the diversity of the family occurs in tropical and subtropical regions of the world, and most of that in the neotropics. Visit Melastomataceae of the World and click on the images link in order to explore some of the diversity of the family.
Plants and art resource link: time-lapse video of some plants from Buenos Aires and area: La lenta belleza de las plantas (link removed due to the video seemingly making use of copyrighted material from elsewhere), from user poseidon1257@vimeo (discovered via a Facebook friend, Elizabeth B.).