The flora of Crater Lake has not been very thoroughly studied, and offers unusual opportunities. This may be due to a comparatively short season, and possibly because other regions are nearer centers of population.

A student from the Univeristy of Oregon, at present collecting in the park, expects to obtain fully five hundred, and possibly seven hundred, species. Seven species were reported as being from Crater Lake only, but a report from the national herbarium invalidates one determination and two others are reported from one station in northern California, while another is found in this region, but outside the park boundaries. The remaining three are Colomium mazama, Cov., Arinaria pumicola, Cov. and Leib, and Eucepahlus covellii, Greene.