Carex lemmonii
Carex lemmonii, or Lemmon's sedge, is a plant in the sedge family, and is endemic to California. Carex albida (binomial authority L.H.Bailey) is now considered a synonym, but was previously thought to be a separate species; such plants have the common name white sedge. Description. This sedge produces a dense or loose clump of erect stems 40 to 60 centimeters tall from a network of short rhizomes. The inflorescence is a cluster of 5 to 7 spikes over 15 centimeters long. Staminate flowers are located mainly on the terminal spike, while pistillate flowers are mainly located in  the lateral spikes. The fruit is covered in a sac called a perigynium, which is green with a white beak. White sedge. White sedge is endemic to Sonoma County, California, where it is known only from one occurrence at Pitkin Marsh, a wetland between Forestville and Sebastopol. There are fewer than 1000 plants, and likely fewer than 300 according to more recent estimates. It is a federally listed endangered species. The colonies are scattered across of a tract. As with other plants that reproduce vegetatively by cloning from their rhizomes, the number of true separate individual life forms is hard  to estimate, so researchers count visible stems; a recent count revealed fewer than 300, a decrease from nearly 1000. This sedge occurs near a rare local endemic, the Pitkin Marsh lily ("Lilium pardalinum" ssp. "pitkinense").