Engellaria

Engellaria obtusa (synonym Stellaria obtusa) is a species of flowering plant in the family Caryophyllaceae[1] known by the common names Rocky Mountain chickweed,[2] blunt-sepaled starwort, and obtuse starwort. It is the sole species in genus Engellaria.[3] It is native to western North America, from British Columbia and Alberta to California to Colorado, where it grows in moist areas in forests and on mountain slopes.

It is a rhizomatous perennial herb producing a prostrate, creeping, branching stem up to about 20 centimeters long, sometimes forming mats. The oval leaves are up to about a centimeter long and are borne in opposite pairs on the stem. Solitary flowers occur in the leaf axils, each borne on a short pedicel. The small flower has no petals, just four to five blunt-tipped green sepals each a few millimeters long.