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Bouteloua barbata
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Six-weeks Grama
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Bouteloua barbata

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About Six-weeks Grama (Bouteloua barbata) Bouteloua barbata is a species of grass known by the common name six-weeks grama. It is native to North America, where it occurs in the southwestern United States and south to Oaxaca in southern Mexico. It may occur in Montana. It is also present in Argentina. This species is an annual or perennial grass producing tufts of stems up to 30 to 75 cm (12 to 30 in) long, lying prostrate, spreading, or standing erect. The inflorescence has up to 11 branches, each a dense row of up to 40 spikelets. The fruit weighs about 0. 03 milligrams. This lightweight seed is dispersed on the wind and by animals. It is annual or perennial, sprouting from seed or from its root crown after summer rainfall. Flowering usually begins around July and lasts until October. There are three varieties of this species. The var. barbata is an annual plant with decumbent stems that may root at stem nodes, var. rothrockii, sometimes considered a separate species, is perennial with erect stems, and var. sonorae, which is limited to northern Mexico, spreads via stolons.
Plant Description
Plant Type

Flower Color

Native Status

Natural Setting
Elevation ?
-185' - 5613'

Annual Precip. ?
2.5" - 30.9"

Summer Precip. ?
0.16" - 2.84"

Coldest Month ?
37.1° F - 64.2° F

Hottest Month ?
66.9° F - 89.3° F

Humidity ?
2.46 vpd - 42.82 vpd

Landscaping Information
Nursery Availability
Never or Almost Never Available

Other Names
Common Names
Sixweeks Grama

Sources include: Wikipedia. All text shown in the "About" section of these pages is available under the Creative Commons Attribution-ShareAlike License. Plant observation data provided by the participants of the California Consortia of Herbaria, Sunset information provided by Jepson Flora Project. Propogation from seed information provided by the Santa Barbara Botanical Garden from "Seed Propagation of Native California Plants" by Dara E. Emery. Sources of plant photos include CalPhotos, Wikimedia Commons, and independent plant photographers who have agreed to share their images with Calscape. Other general sources of information include Calflora, CNPS Manual of Vegetation Online, Jepson Flora Project, Las Pilitas, Theodore Payne, Tree of Life, The Xerces Society, and information provided by CNPS volunteer editors, with special thanks to Don Rideout. Climate data used in creation of plant range maps is from PRISM Climate Group, Oregon State University, using 30 year (1981-2010) annual "normals" at an 800 meter spatial resolution.

Links:   Jepson eFlora Taxon Page  CalPhotos  Wikipedia  Calflora

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