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Acmispon americanus
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American Bird's-foot Trefoil
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Acmispon americanus

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About American Bird's-foot Trefoil (Acmispon americanus) Acmispon amiericanus is a native annual herb in the Fabaceae (Legume) family that grows in Northern, Southern and Central California in most habitats except desert. It tends to grow in streambanks and wet places, at elevations from sea level to 7,900 feet, often in disturbed areas. As with other members of this genus, it is not often used in gardens but is useful for restoration projects.
Plant Description
Plant Type
Annual herb

Max. Height
1 ft (0.3 m)

Max. Width
1 ft (0.3 m)

Flower Color
Pink, White

Flowering Season
Spring, Summer

Native Status

Natural Setting
Site Type
Streambanks and wet places, disturbed places

Sun, Part Shade

Elevation ?
0' - 10844'

Annual Precip. ?
4.2" - 133.4"

Summer Precip. ?
0.14" - 3.85"

Coldest Month ?
24.6° F - 56.6° F

Hottest Month ?
47.9° F - 84.9° F

Humidity ?
0.01 vpd - 36.74 vpd

Soil Description

Soil PH
5.2 - 7.6

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to -10° F

Wildlife Attracted
Species in the Acmispon genus are host plant to the Presius Duskywing and Acmon Blue butterfly

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

Rarely Used

Max. Summer Water ?
No Summer Water
Keep moist

Propagation ?
For propagating by seed: Hot water treatment.

Common uses
Bee Gardens, Butterfly Gardens

Nursery Availability
Sometimes Available

Other Names
Botanical Names
Lotus purshianus

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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