Ampelodesmos is a monotypic genus of grasses in the family Poaceae, classified in its own tribe Ampelodesmeae within the subfamily Pooideae. The genus contains a single living species, Ampelodesmos mauritanicus, a large clumping perennial bunchgrass native to the Mediterranean Basin. Common names include stramma, Mauritania grass, rope grass, and diss grass.
The genus is thought to have originated through ancient hybrid speciation, arising from a cross between ancestors belonging to the tribes Stipeae and Phaenospermateae. This hybrid origin sets it apart from most other grass genera and accounts for its placement in its own monotypic tribe.
Ampelodesmos mauritanicus is a robust, tussock-forming bunchgrass distinguished by its long, arching leaves with notably sharp edges capable of inflicting small cuts on bare skin, and by its striking nodding flower panicles that can reach nearly two feet in length. It occurs naturally across the western and central Mediterranean region, including Spain, France, Italy, Greece, and much of North Africa. Outside its native range it is grown as an ornamental grass, though it has the capacity to become invasive in non-native ecosystems.
Etymology
The genus name Ampelodesmos derives from the Greek ampelos ("vine") and desmos ("bond"), reflecting the plant's historical use as a cord or string for tying up grapevines.
Distribution
Ampelodesmos mauritanicus is native to the Mediterranean region, occurring in Spain (including the Balearic Islands), France (including Corsica), Italy (including Sardinia and Sicily), Greece, and across North Africa in Algeria, Morocco, Tunisia, and Libya. It has been introduced beyond its native range, where it is grown as an ornamental and can establish as an invasive plant.
Ecology
Within its native Mediterranean range, diss grass grows in dry, open habitats typical of the maquis and garigue. Outside the Mediterranean Basin it can escape cultivation and become invasive in non-native ecosystems, displacing local vegetation.
Cultural Uses
Diss grass has been used for centuries in its native Mediterranean range as a fiber plant. The long leaves are harvested to make mats, brooms, baskets, and twine. The plant's name itself records an older use: binding bundles of grapevines in vineyards.
