Munroa is a small genus of annual and perennial grasses belonging to the family Poaceae (order Poales), native to the New World. The genus has a disjunct distribution spanning arid and semi-arid regions of western North America — from western Canada through the west-central United States and northern Mexico — and the Andean and southern cone of South America, including Peru, Bolivia, Chile, and Argentina. This wide but discontinuous range reflects the genus's adaptation to open, dry grassland and steppe habitats.
The genus was described in the nineteenth century and currently comprises approximately five to six accepted species, with Munroa squarrosa being the most widespread North American representative and several Andean species (M. andina, M. decumbens, M. mendocina) occupying high-altitude South American grasslands. One former member, Munroa benthamiana, has been transferred to the related genus Blepharidachne.
As members of the grass family, Munroa species share the characteristic grass body plan: narrow linear leaves, hollow or pithy stems, and small wind-pollinated flowers arranged in spikelets. Their ecological role is primarily as components of native short-grass prairie, semi-desert grassland, and puna vegetation.
Distribution
Munroa species occur across a disjunct New World range. Munroa squarrosa grows in western Canada, the west-central United States, and northern Mexico (Chihuahua, Coahuila, Durango). The remaining species — M. andina, M. decumbens, and M. mendocina — are native to the Andean region, spanning Peru, Bolivia, Chile, and Argentina.
Taxonomy Notes
Munroa belongs to the family Poaceae (grasses), order Poales, and has been placed in the subfamily Chloridoideae by various treatments. One species formerly included in the genus, Munroa benthamiana, has been reassigned to Blepharidachne. GBIF recognises approximately seven infrageneric taxa under the genus.
