When I first saw Weed's mariposa lilies blooming years ago in Los Peñasquitos Canyon Preserve, I was struck by their unique beauty.  Mariposa is the Spanish word for "butterfly" and it's easy to see how they earned that common name when one witnesses them fluttering in the breeze.  As with too many of my favorite species that have a limited range in our southern California and Baja California region, its conservation status is vulnerable due to habitat loss from development.