purple three-awn

Aristida purpurea

Description 2

Purple three-awn is the most common bunchgrass in the McDowell Sonoran Preserve. There are four varieties in the preserve, but only two of them are common: purple three-awn and Parish's three-awn (the other two share most characters of these as well). The mature plant is dense with many leaves and inflorescences. Leaves are 25 cm long and 1 to 1.5 mm wide. Purple three-awn has feathery inflorescences; Parish's purple three-awn inflorescences are stiff. Flowers and immature seeds have three awns parallel to each other; with maturity the awns spread by twisting a bit at the base.

SEINet description

Sources and Credits

  1. (c) Steve Jones, some rights reserved (CC BY-NC), uploaded by Steve Jones
  2. (c) Steve Jones, some rights reserved (CC BY-SA)

More Info

iNat Map

Occurrence Common
Stolons Absent
Seedhead color Red-purple
Seed hairs Absent
Seed bristles Absent
Seed awns Present
Inflorescence Narrow panicle
Height 50cm - 1m