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Sixweeks Threeawn
Aristida adscensionis

About Sixweeks Threeawn (Aristida adscensionis) Aristida adscensionis is a species of grass known by the common name sixweeks threeawn. It is native to the Americas but it is distributed nearly worldwide. It grows easily in disturbed and waste areas and has potential to become a weed. This annual grass is quite variable in appearance, its size and shape determined largely by environmental conditions. It grows in a tuft to heights between 5 and 80 centimeters. It forms a narrow flower cluster of spikelets, each fruit with three awns.
Plant Description
Plant Type

Max. Height
0.16 - 2.6 ft (0.05 - 0.8 m)

Flower Color

Native Status

Natural Setting
Site Type
Dry open places, rocky places


Elevation ?
-190' - 7081'

Annual Precip. ?
2.5" - 46.7"

Summer Precip. ?
0.14" - 2.88"

Coldest Month ?
38.6° F - 64.2° F

Hottest Month ?
56.2° F - 89.3° F

Humidity ?
0.91 vpd - 42.79 vpd

Landscaping Information
Ease of Care
Moderately Easy

Water Requirement ?
Extremely Low, Very Low
Extremely Low
Very Low
Moderate - High

Nursery Availability
Rarely Available

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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