The pendulous spikes in bloom. The spike in the center has three spikelets visible, and the lowest spikelet is blooming, with orange stamens hanging below and feathery stigmas protruding horizontally.
Sideoats grama is a warm-season grass. The culms (flowering stems) are 30–100 cm (12–39 in) tall,[4] and have alternate leaves that are concentrated at the bottom of the culm.[5] The leaves are light green to blue-green in color, and up to 6 mm (1⁄4 in) across.[5]
Alternately arranged spikes in a raceme
The flowers bloom in summer and autumn. They consist of compact spikes that hang alternately in a raceme along the top 15 to 25 cm (6 to 10 in) of the culm. The spikes often fall to one side of the stem, which gives the plant its name. There are 10–50 spikes per culm, and in each spike there are three to six spikelets, or rarely as many as 10. Each spikelet is 4.5 to 10 mm (3⁄16 to 13⁄32 in) long[4] and consists of two glumes and two florets. One of the florets is fertile, and has colorful orange to brownish red anthers and feathery white stigmas during the blooming period, which contrasts with the pale green, pale red, greenish-red, or purple[6] color of the spikes themselves.[5]
After blooming, the spikes become straw-colored. The fertile florets produce seeds, and when they are ripe, the spikes fall to the ground.[5]
Distribution and habitat
Sideoats grama grows well on mountainous plateaus, rocky slopes, and sandy plains. It is drought- and cold-tolerant and is hardy in USDA hardiness zones 4–9 (average annual minimums of −30 to 25 °F, −34 to −4 °C).
^USDA, NRCS (n.d.). "Bouteloua curtipendula". The PLANTS Database (plants.usda.gov). Greensboro, North Carolina: National Plant Data Team. Retrieved 10 January 2016.
^Soule, J.A. 2012. Butterfly Gardening in Southern Arizona. Tierra del Soule Press, Tucson, AZ
^"Texas State Symbols". About Texas. Texas State Library and Archives Commission. 2006-11-14. Archived from the original on 2018-12-24. Retrieved 2007-02-01.
