SafePlants

American Beakgrass and Obovate Beakgrain (Diarrhena spp.)

The genus Diarrhena encompasses several species of beakgrass, native perennial grasses found in North America. Two prominent species are Diarrhena americana and Diarrhena obovata, commonly known as American beakgrass/beakgrain and obovate beakgrain, respectively. These grasses are valued for their attractive appearance and ease of cultivation.

Considerations for Pets

• The text mentions that the seeds of Diarrhena species are tapered to a pointed beak.

Considerations for Children

• The text mentions that the seeds of Diarrhena species are tapered to a pointed beak.

Taxonomy and Nomenclature

• Scientific Name: Diarrhena P. Beauv.
• Family: Poaceae (Grass family, also known as Gramineae)
• Diarrhena americana:
  • Synonyms: Diarrhena americana P. Beauv.
  • Common Names: American beak grass, American beakgrain, American karycarpus
• Diarrhena obovata:
  • Synonyms: Diarrhena americana var. obovata
  • Common Names: Obovate beakgrain, beak grass

Distribution and Habitat

• Native to North America, specifically the eastern regions.
• Diarrhena obovata is the only species found in Iowa.
• Prefers rich, moist soil but tolerates average soil conditions.
• Adapted to full shade to part shade conditions.

Morphological Characteristics and Growth Habits

• Perennial grasses, meaning they live for more than two years.
• Rhizomatous: Spreads through rhizomes, allowing it to colonize areas.
• Flowering stems reach 1-4 feet in height.
• Grows to a height of 30-40 inches.

Ecological Role

• American beakgrain is considered a rare species and potentially threatened in its natural range.