Cynosurus, commonly known as dogstail grasses, is a small genus of annual and perennial grasses belonging to the family Poaceae (order Poales). The genus is native to the temperate regions of Eurasia and North Africa, with its core range spanning Europe, the Azores, the Caucasus, Iran, Turkey, Algeria, and Tunisia. Several species have been introduced beyond their native range and are now naturalized in parts of Australia and in North and South America.
The genus is characterised by its distinctive inflorescences — spike-like panicles in which sterile spikelets intermingle with fertile ones, giving the seedhead a bristly or comb-like appearance that accounts for the common name "dogstail." The most widely known species, Cynosurus cristatus (crested dogstail), is a slender perennial of old meadows, pastures, and downland turf across Europe; it is a constituent of traditional hay meadow seed mixes and tolerates close grazing. Cynosurus echinatus (rough dogstail) is an annual with a coarser, more one-sided seedhead and is considered an agricultural weed in some regions where it has naturalised. GBIF recognises three accepted species in the genus.
Etymology
The name Cynosurus derives from the Greek words kynos (dog) and oura (tail), referring to the distinctive, bristly spike-like inflorescence that resembles a dog's tail — the source of the common name "dogstail grass."
Distribution
The genus is native to Europe (including the Azores), North Africa (Algeria, Tunisia), Turkey, the Caucasus, and Iran. Several species — notably Cynosurus echinatus — have been widely introduced and are now naturalised in Australia, North America, and South America.
Ecology
Cynosurus species occupy a range of open, grassy habitats. Cynosurus cristatus is a characteristic constituent of nutrient-poor permanent grasslands, meadows, and chalk downland in Europe, where it is a valued component of traditional hay meadow communities. Cynosurus echinatus, an annual, thrives in disturbed ground and has become a weed of pastures and roadsides in its introduced range.
