Mimulus norrisii (Scrophulariaceae), a new species from the southern Sierra Nevada

Mimulus norrisii, a new cliff-dwelling species from the Sierra Nevada foothills primarily in Sequoia National Park, Tulare County, California, is described and illustrated. The new species is ecologically similar and morphologically closest to M. dudleyi in sect. Paradanthus but differs in its moister habitat requirements, leaves with attenuate bases and less serrate margins, and in particular the smaller calyces that develop conspicuous enlarged and rounded ribs.