(Willd. ex Kunth) Lag. ex Griffiths
Blue grama accounts for most of the net primary productivity in the shortgrass prairie of the central and southern Great Plains. It is a green or greyish, low-growing, drought-tolerant grass with limited maintenance.
Blue grama has green to greyish leaves less than 3 mm (0.1 in) wide and 1 to 10 in (25 to 250 mm) long. The overall height of the plant is 6 to 12 in (15 to 30 cm) at maturity.
The flowering stems (culms) are 7 to 18 in (18 to 46 cm) long. At the top are one to four, usually two, comb-like spikes, which extend out at a sharp angle from the flowering stem. Each spike has 20 to 90 spikelets. Each spikelet is 5 to 6 mm (0.20 to 0.24 in) long, and has one fertile floret and one or two reduced sterile ones. Below the florets are two glumes, one 1.5 to 3 mm (0.06 to 0.12 in) long and the other 3.5 to 6 mm (0.14 to 0.24 in) long. The fertile floret has a lemma (bract) 5 to 5.5 mm (0.20 to 0.22 in) long, with three short awns (bristles) at the tip, and the sterile floret has a lemma about 2 mm (0.08 in) long with three awns about 5 mm (0.2 in) long. If pollinated, the fertile floret produces an oblong-elliptic brown seed 2.5 to 3 mm (0.10 to 0.12 in) long. When the seed is mature, the whole spikelet detaches, except for the two glumes, which remain.
Blue grama is readily established from seed, but depends more on vegetative reproduction via tillers. Seed production is slow, and depends on soil moisture and temperature. Seeds dispersed by wind only reach a few meters (6 ft); farther distances are reached with insects, birds, and mammals as dispersal agents. Seedling establishment, survival, and growth are greatest when isolated from neighboring adult plants, which effectively exploit water in the seedling's root zone. Successful establishment requires a modest amount of soil moisture during the extension and development of adventitious roots.
Established plants are grazing-, cold-, and drought-tolerant, though prolonged drought leads to a reduction in root number and extent. They employ an opportunistic water-use strategy, rapidly using water when available, and becoming dormant during less-favorable conditions. In terms of successional status, blue grama is a late seral to climax species. Recovery following disturbance is slow and depends on the type and extent of the disturbance.
Horticulture and agriculture
Blue grama is valued as forage.
B. gracilis is grown by the horticulture industry, and used in perennial gardens, naturalistic and native plant landscaping, habitat restoration projects, and residential, civic, and highway erosion control. Blue grama flowers are also used in dried flower arrangements.
- "Bouteloua gracilis". Natural Resources Conservation Service PLANTS Database. USDA.
- "Plant Name Details for Bouteloua gracilis" (HTML). International Plant Names Index (IPNI). International Organization for Plant Information (IOPI).
- "Bouteloua gracilis". County-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2013. Retrieved July 13, 2018.
- "Bouteloua gracilis". State-level distribution map from the North American Plant Atlas (NAPA). Biota of North America Program (BONAP). 2013. Retrieved July 13, 2018.
- Smoliak, S.; Ditterline, R.L.; Scheetz, J.D.; Holzworth, L.K.; Sims, J.R.; Wiesner, L.E.; Baldridge, D.E.; Tibke, G.L. "Blue Grama (Bouteloua gracilis)". Montana Interagency Plant Materials Handbook. Montana University Extension Service. Archived from the original on June 10, 2010.
- Anderson, Michelle D. (2003). "Bouteloua gracilis". Fire Effects Information System (FEIS). U.S. Department of Agriculture (USDA), Forest Service (USFS), Rocky Mountain Research Station, Fire Sciences Laboratory. Retrieved August 24, 2016 – via https://www.fs.fed.us/database/feis/.
- Sun, Bi-xing; Phillips, Sylvia M. "Bouteloua gracilis". Flora of China. 22 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- Hilty, John (2016). "Blue Grama (Bouteloua gracilis)". Illinois Wildflowers.
- Sun, Bi-xing; Phillips, Sylvia M. "Bouteloua". Flora of China. 22 – via eFloras.org, Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.
- Katy Chayka (2016). "Bouteloua gracilis (Blue Grama)". Minnesota Wildflowers.
- Stevenson, Matilda Coxe (1915). "Ethnobotany of the Zuni Indians". SI-BAE Annual Report #30. p. 83.
- Bocek, Barbara R. (1984). "Ethnobotany of Costanoan Indians, California, Based on Collections by John P. Harrington". Economic Botany. 38 (2): 255.
- Elmore, Francis H. (1944). Ethnobotany of the Navajo. Sante Fe, NM: School of American Research. p. 25.
|Wikimedia Commons has media related to Bouteloua gracilis.|
|Wikispecies has information related to Bouteloua gracilis|