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San Diego Birdsfoot Trefoil Back to Plant Page
Acmispon micranthus

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About San Diego Birdsfoot Trefoil (Acmispon micranthus) Lotus hamatus is a species of legume known by the common name San Diego bird's-foot trefoil. It is native to the coastal mountain ranges of California and Baja California, where it grows in various types of scrub and canyon habitat. It is an annual herb taking a spreading or upright form. It is lined with leaves each made up of oval leaflets each about a centimeter long. The flower cluster is a small bunch of red and yellow flowers. Each flower is in a tubular calyx of sepals and is only a few millimeters long. The fruit is a narrow, bent legume pod up to 1.5 centimeters long, including the hooked beak at the tip.
Plant Description
Plant Type
Annual herb

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

Flower Color
Yellow, Red

Native Status

Natural Setting
Site Type
Desert canyons, washes, disturbed places


Elevation ?
0' - 4442'

Annual Precip. ?
5.9" - 120.7"

Summer Precip. ?
0.14" - 4.19"

Coldest Month ?
38.4° F - 57.4° F

Hottest Month ?
57.4° F - 86.3° F

Humidity ?
0.23 vpd - 37.01 vpd

Landscaping Information
Nursery Availability
Rarely Available

Other Names
Common Names
San Diego Bird's-foot Trefoil

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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