Diarrhena americana

Diarrhena americana, also known as American beak grass or American beakgrain, is a native, perennial bunchgrass of North America.[2][3]

Diarrhena americana
Botanical illustration[1]
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Poaceae
Subfamily: Pooideae
Genus: Diarrhena
Species:
D. americana
Binomial name
Diarrhena americana
Synonyms
  • Festuca diandra Michx 1803 not Moench 1794
  • Diarina festucoides Raf.
  • Korycarpus arundinaceus Zea ex Lag.
  • Roemeria zeae Roem. & Schult.
  • Corycarpus diandrus Kuntze
  • Diarina sylvatica Raf.
  • Diarrhena arundinacea (Zea ex Lag.) Rydb.
  • Diarrhena festucoides (Raf.) Fernald
  • Festuca diandra Michx.

Historically, Diarrhena americana was the only species of beak grass recognized in the United States; however studies have suggested that the known beak grass is to be classified into two distinct species, Diarrhena americana and Diarrhena obovata.[4]

Distribution

Diarrhena americana naturally occurs throughout the Midwestern United States, including in eastern Oklahoma and Missouri; south to Alabama; east to Kentucky, the Appalachian Mountains and northern Maryland; and north to southern Illinois, Indiana, Ohio, and southern Michigan.[2][5][6]

The grass plant lives in rich cove forests and woodlands, preferring to grow in the moist soils of shaded ledges and riverbanks.[7] It grows in rich, moist woodlands from Missouri to Maryland and south to Oklahoma and Alabama.[2]

Description
In cultivation at the Berlin Botanical Garden

Diarrhena americana is a bunchgrass that grows in 2–3 feet (0.61–0.91 m) tall clumps. It has bright green leaf blades, that can grow up to 0.75 inches (1.9 cm) in width.[2]

These perennial plants can grow flowers that grow above the foliage, with 3 inch tall floral spikes, during the early to mid-summer. The culms range from 60–131 cm (24–52 in) high.[2][8][8]

By late summer the flowers turn into hard, brown seed heads.[2] Each seed is reduced to a blunt beak, which is where the common name of beak grass comes from, and this beak is dispersed.[8]

Cultivation

Diarrhena americana is cultivated as an ornamental grass, grown in traditional and wildlife gardens, and in natural landscaping projects.[8]

It is considered an easy plant to grow and maintain, not needing much sun or water while generally being a tough plant. It will tolerate drought, heavy shade, competition from eastern black walnuts, and urban air pollution.[8] When available, the plant will grow into dense clumps in moist rich soils in full shade.[8]

Conservation

Diarrhena americana is a listed endangered species in Maryland and Wisconsin, and a threatened species in Michigan.[3]

References
  1. Hitchcock, A.S. (rev. A. Chase). 1950. Manual of the grasses of the United States. USDA Miscellaneous Publication No. 200. Washington, DC.
  2. "Utah State University: Intermountain Herbarium". Archived from the original on June 11, 2011. Retrieved June 5, 2010.
  3. "Diarrhena americana 'Beauv.'" (PDF). Retrieved May 30, 2009.
  4. Brandenburg, D.M., J.R. Estes, and S.L. Collins. (1991). "A Revision of Diarrhena (Poaceae) in the United States" (PDF). Torrey Bot. Club. Retrieved January 28, 2019.CS1 maint: uses authors parameter (link)
  5. "The Grass Manual on the Web.edu: Distribution map for Diarrhena americana". Archived from the original on April 28, 2014. Retrieved May 18, 2017.
  6. "Beak Grass Diarrhena obovata". Retrieved January 28, 2019.
  7. "Diarrhena americana Beauv". Retrieved January 28, 2019.
  8. "Diarrhena americana". Retrieved 2014-04-25.
  • Koyama, T. and S. Kawano. 1964. Critical taxa of grasses with North American and eastern Asiatic distribution. Can. J. Bot. 42:859–864.
  • Tateoka, T. 1960. Cytology in grass systematics: A critical review. Nucleus (Calcutta) 3:81–110.
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