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Alkali Weed
Cressa truxillensis

About Alkali Weed (Cressa truxillensis) Cressa truxillensis is a species of flowering plant in the morning glory family known by the common name spreading alkaliweed. It is native to the western United States and Mexico, where it grows in habitat with saline or alkaline soils, such as beaches, desert flats, and playas. This is a perennial herb producing an erect stem with many branches up to about 25 centimeters tall. The clump of stems is densely lined with silky hairs and studded with many small hairy oval leaves, each under a centimeter long. Flowers appear in the axils of the uppermost leaves. Each has a white corolla with five pointed lobes surrounded by hairy green sepals. There are five protruding stamens and two styles.
Plant Description
Plant Type
Perennial herb

Max. Height
9.8 in (24.9 cm)


Growth Rate

Flower Color

Flowering Season

Native Status

Natural Setting
Site Type
Saline and alkaline soils


Elevation ?
-228' - 5098'

Annual Precip. ?
2.5" - 31.6"

Summer Precip. ?
0.15" - 1.84"

Coldest Month ?
31.2° F - 60.1° F

Hottest Month ?
59.8° F - 89.2° F

Humidity ?
0.62 vpd - 44.17 vpd

Soil Description
Prefers loamy or clay soils. Grows poorly in sandy soils.

Sunset Zones ?
7*, 8*, 9*, 10*, 11*, 13, 14*, 15, 16, 17, 18*, 19*, 20*, 21*, 22*, 23*, 24*

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

Nursery Availability
Sometimes Available

Other Names
Common Names
Spreading Alkaliweed

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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