Where to find it: Along roadsides and in meadows throughout the eastern half of Yosemite Valley. It's very common here in the early summer - so widespread that it merits its own episode of Yosemite Nature Notes (see below), well worth watching if you're interested enough in this flower that you have, for instance, visited a web page about it.
Blooms: May - July
Asclepias speciosa etymology: Asclepias is named for Asclepius, Greek god of healing, due to the medicinal uses of members of the genus. Please note that this particular member contains poison. Speciosa derives from the Latin term speciosus, meaning beautiful, attractive, or just generally good-looking.