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