Neostapfia is a genus of endemic Californian bunchgrasses, in the subfamily Chloridoideae of the grass family, Poaceae. The only known species is Neostapfia colusana, with the common name Colusa grass.
Neostapfia colusana is endemic to the Central Valley of California, in the northern section's Sacramento Valley and in the southern section's San Joaquin Valley. The bunchgrass grows in vernal pools, which are seasonal shallow freshwater ponds.
The genus was named for the botanist Otto Stapf.
The plant is limited to vernal pool habitats, a type of ecosystem which is increasingly rare as Central Valley land is consumed by development and agriculture, and damaged by flood control regimes and other alterations of hydrology.
- Jepson (JM2): Neostapfia colusana
- Kew World Checklist of Selected Plant Families
- USDA: Neostapfia colusana
- Davy, Joseph Burtt. 1898. "Stapfia, a new genus of Meliceae, and other noteworthy grasses." Erythea 6 (11): 109-113, text.
- Davy, Joseph Burtt. 1898. "Stapfia, a new genus of Meliceae, and other noteworthy grasses." Erythea 6 (11): plate 1, line drawings of Neostapfia colusana, named as Stapfia colusana
- Davy, Joseph Burtt 1899. "Concerning Stapfia." Erythea 7 (43)
- Calflora Database: Neostapfia colusana, with county distribution maps.
- Biota of North America Program 2013 county distribution maps for Neostapfia colusana
- The Calflora Database: Information on California plants for education, research and conservation, with data contributed by public and private institutions and individuals, including the Consortium of California Herbaria. 2015. Berkeley, California
- California Native Plant Society Rare Plant Profile