Stipa L. is a genus of roughly 140–141 accepted species of perennial grasses in the family Poaceae (subfamily Pooideae, tribe Stipeae), widely known by the common names feather grass, needle grass, and spear grass. The genus was described by Linnaeus in his 1753 Species Plantarum and is named from the Latin word stipa, meaning 'oakum' (loose fibers), an allusion to both the feathery inflorescences and the traditional use of Stipa tenacissima as a cordage plant.
Plants are annual or perennial, tufted and cespitose (never rhizomatous), with culms ranging from 10 to 200 cm tall. The leaves are mostly basal, with prominently ribbed blades that roll tightly inward when dry. Inflorescences are contracted terminal panicles; spikelets are 12–90 mm long and contain a single floret. The lemmas are coriaceous to indurate, tan or brown, and bear a sharp callus at the base. The genus is most readily recognised by its awns, which are 50–500 mm long, persistent, usually once- or twice-geniculate (bent at one or two joints), and sometimes plumose over part or all of their length. These hygroscopic, twisted awn segments facilitate seed dispersal by drilling into the soil.
Stipa has an almost cosmopolitan distribution and occurs across steppes, dry grasslands, and savanna habitats on every major continent. The genus has long been ecologically important: certain prairie and steppe plant communities are dominated by Stipa species, and in western North American Blue Oak savannas it historically formed a significant component of the understory prior to invasion by European grasses. Several species are valued as forage crops, while others — including S. gigantea, S. brachytricha, S. splendens, and S. pulchra — are grown as ornamental grasses in horticulture.
Etymology
The genus name Stipa derives from the Latin stipa, meaning 'oakum' — the loose, fibrous material used in caulking. The name alludes to two aspects of the genus: the feathery, plume-like inflorescences and the practical use of Stipa tenacissima (esparto grass) as a source of cordage fiber. The genus was formally established by Carl Linnaeus in 1753 in Species Plantarum (p. 78). Recognized synonyms include Sparteum P.Beauv., Stupa P.Ascherson (1864), and Trichosantha Steud.
Distribution
Stipa is nearly cosmopolitan, occurring across grassland, steppe, and savanna biomes on every major continent. The genus is particularly characteristic of Eurasian steppes: the native range documented in cultivation sources extends from E. Asia (Siberia, Mongolia, China) through Central Asia (Kazakhstan, Afghanistan) to Pakistan. In Europe the genus is present throughout the continent, with Switzerland hosting at least six species or aggregates: S. capillata, S. eriocaulis (with subspecies austriaca and lutetiana), S. pennata, S. pulcherrima (with subsp. epilosa), and S. tirsa. In North America, Stipa species are components of western grassland and Blue Oak savanna vegetation, where they were more prevalent before European grass introductions. The genus also occurs in southern Africa (S. capensis) and South America.
Ecology
Stipa species are characteristic grasses of open, dry habitats — steppes, dry grasslands, prairies, and savanna understoreys. They tolerate a wide range of soil textures (sandy to clay) provided drainage is adequate, and grow in mildly acid to alkaline conditions. The highly specialized geniculate, hygroscopic awn is an ecological adaptation: it coils and uncoils with changes in atmospheric humidity, drilling the sharp-callused seed into the soil surface and thus enhancing establishment in hard, dry ground. Certain prairie plant associations in North America are dominated by Stipa species. In western US Blue Oak savannas, Stipa historically formed a significant part of the understory, a role that has diminished following invasion by introduced European annual grasses.
Cultivation
Stipa species are easily grown in ordinary, well-drained garden soil in a position of full sun. They thrive in dry soils and tolerate a wide range of soil textures from sandy to clay, as well as mildly acidic, neutral, and alkaline pH. They will not tolerate shade. Most are fully hardy to approximately -15°C (USDA hardiness zones 6–9). Ornamentally valuable species cited in cultivation include S. gigantea (giant feather grass), S. brachytricha, S. arundinacea, S. splendens, and S. pulchra. These grasses are valued for their graceful, airy inflorescences and movement in wind.
Propagation
Seeds can be sown in March and germinate within approximately two weeks under normal temperate conditions. Division in spring is an alternative method of propagation for established clumps.
Cultural Uses
Several Stipa species have longstanding human uses. The leaves provide fibre used in paper making, and the flowering stems have been employed by Central Asian nomadic peoples for matting, fencing, fuel, and the construction of the walls of summer tents (yurts). The most economically significant species is esparto grass, historically placed in Stipa as S. tenacissima and now reclassified as Macrochloa tenacissima, which is used extensively in crafts and industrial paper making across North Africa and the Iberian Peninsula. Multiple Stipa species also serve as important forage crops in steppe grasslands.
Taxonomy Notes
Stipa L. sits in tribe Stipeae of subfamily Pooideae within the grass family Poaceae. The GBIF Backbone Taxonomy records the genus as accepted under the authorship of Linnaeus, with three recognized synonyms at genus rank: Sparteum P.Beauv., Stupa P.Ascherson (1864), and Trichosantha Steud. Plants of the World Online (POWO/Kew) recognized 141 accepted species and primary hybrids as of August 2025, while the GBIF backbone records 299 descendant taxa including probable synonyms and subspecific entities. A number of species historically placed in Stipa — including esparto grass, now Macrochloa tenacissima — have been transferred to other genera within tribe Stipeae following molecular and morphological reassessments.
