Oreobroma pygmaea (Lewesia or Bitterroot)
Portulacaceae (Portulaca Family)

Montane, subalpine, alpine. Woodlands, openings, meadows, tundra. Spring, summer.

In 1814 Frederick Pursh named a new genus "Lewisia" in honor of Meriwether Lewis who collected the first specimen of the genus for science in Montana in 1806.  The plant collected was called Lewisia rediviva, for it would "revive" and grow even if kept in the dark and stored for long periods of time.  

Asa Gray named the pictured species Talinum pygmaeum in 1862, Thomas Howell renamed it Oreobroma pygmaea in 1893 (at the same time he coined the Oreobroma name), and Benjamin L. Robinson renamed it Lewisia pygmaea in 1897.

William Weber, the plant authority for Colorado, accepts Howell's Oreobroma classification. 

Oreobroma  means "mountain food" and refers to the edible, but bitter, root.  The Bitterroot Mountains take their name from Oreobroma's cousin Lewisia rediviva, which Lewis, Clark, and company had a very difficult time swallowing.