The only known species is Hainardia cylindrica, known by several common names, including barbgrass, one-glumed hard-grass, and thintail. It is native to the Mediterranean and to nearby regions from Madeira and the Canary Islands east to Crimea and Iran. It ia also reportedly naturalized in coastal regions in scattered locales in Australia, New Zealand, the United States (CA OR TX LA SC), Baja California, and temperate South America (Brazil, Uruguay, Argentina, Chile).
Hainardia cylindrica is an annual grass of salt marshes and estuaries, thriving in saline and alkaline soils in aquatic habitats. It has a branching stem reaching a maximum height near half a meter. The thready leaves are ribbed and rough to the touch on the upper surfaces. The top few centimeters of the stem is made up of a cylindrical inflorescence with each spikelet embedded into it and dividing it into segments which can break off.
- Kew World Checklist of Selected Plant Families
- Greuter, Werner Rodolfo 1967. Boissiera. Memoires du Conservatoire de Botanique et de l'Institut de Botanique Systématique de l'Université de Genève 13: 178
- "Hainardia". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 19 January 2016.
- "BSBI List 2007". Botanical Society of Britain and Ireland. Archived from the original (xls) on 2015-02-25. Retrieved 2014-10-17.
- "Biota of North America Program 2013 county distribution map".
- "Genere Hainardia - Flora Italiana". luirig.altervista.org.
- "UC/JEPS: Jepson Manual treatment for HAINARDIA cylindrica". ucjeps.berkeley.edu.
- "Plants Profile for Hainardia cylindrica (barbgrass)". plants.usda.gov.
- "Grass Manual Treatment".
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