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Juncus mexicanus

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About Mexican Rush (Juncus mexicanus) Juncus mexicanus (Mexican Rush) is native to the southwestern quadrant of the United States and parts of Mexico and Central and South America. It is a plant of moist areas in a great number of habitats, from coast to desert to mountain and from sea level to 10,000 ft. It may be found in standing water or saturated soil. This is a rhizomatous perennial herb which varies in appearance. The thin erect stems reach a maximum height anywhere from 10 to 80 centimeters. The leaves grow from the base of the stem and can exceed 20 centimeters in length. The flower cluster usually sprouts from the side of the stem rather than the tip. The flowers grow on long peduncles. Each individual flower has thick petals with longitudinal stripes which vary in color from bright to dark. It has six stamens with very large anthers, and long stigmas. This species is sometimes treated as a variant of Juncus arcticus or Juncus balticus.
Plant Description
Plant Type

Max. Height
0.33 - 2.6 ft (0.1 - 0.8 m)



Growth Rate
Fast, Moderate

Evergreen, Summer Semi-Deciduous

Flower Color
Green, Brown

Flowering Season

Native Status

Natural Setting
Site Type
Found is boggy or marshy locations throughout the state

Part Shade

Elevation ?
2' - 10996'

Annual Precip. ?
2.8" - 110.0"

Summer Precip. ?
0.14" - 3.75"

Coldest Month ?
20.1° F - 60.6° F

Hottest Month ?
44.6° F - 88.6° F

Humidity ?
0.46 vpd - 45.66 vpd

Soil Description
Tolerates any soil as long as adequate moisture is present

Soil PH
5.0 - 8.0

Slow, Standing

Cold Tolerance(° F)
Tolerates cold to 15° F

Companion Plants
Due to its spreading tendency, use with caution in garden ponds or bioswales. Use with other marsh plants such as Carex sp., Spikerush (Eleocharis sp.), Rush (Juncus sp.), SaltMarsh Fleabane (Pluchea odorata), Arrowhead (Sagittaria sp.), Willow (Salix sp.), Hedgenettle (Stachys bullata), and Cattail (Typha sp.)

Landscaping Information
Water Requirement ?
Moderate - High
Extremely Low
Very Low
Moderate - High

Moderately Popular

Max. Summer Water ?
Keep moist
No Summer Water
Keep moist

Nursery Availability
Commonly 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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