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Collared Annual Lupine
Lupinus truncatus

About Collared Annual Lupine (Lupinus truncatus) Lupinus truncatus is a species in the Fabaceae (Legume) family known by the common name Collared Annual Lupine. It is native to the coastal mountain ranges and canyons of Baja California and California as far north as the San Francisco Bay Area. It grows in slope habitat such as chaparral and woodland, including areas that have recently burned. This is an annual herb growing no more than half a meter tall. Each palmate leaf is made up of 5 to 8 narrow linear leaflets measuring 2 to 4 centimeters in length and just a few millimeters wide. The leaflets usually have truncate tips, or tips that appear sharply cut off and squared, the characteristic that gives the plant its species name. The flower cluster is a raceme of widely-spaced flowers each roughly a centimeter long. The flower is magenta or reddish purple in color with a yellowish or magenta patch on its banner. The fruit is a hairy legume pod about 3 centimeters long and half a centimeter wide.
Plant Description
Plant Type
Annual Herb

Max. Height
1 - 1.6 ft (0.3 - 0.49 m)

Max. Width
1 ft (0.3 m)


Fragrant - Pleasant

Flower Color
Lavender, Purple, Pink

Flowering Season
Spring, Winter

Native Status

Natural Setting
Site Type
Openings in coastal sage scrub or chaparral, or in grasslands

Sun, Part Shade

Elevation ?
-14' - 6112'

Annual Precip. ?
4.9" - 46.1"

Summer Precip. ?
0.14" - 2.55"

Coldest Month ?
40.1° F - 58.6° F

Hottest Month ?
58.8° F - 87.2° F

Humidity ?
0.47 vpd - 38.04 vpd

Soil Description

Soil PH
5.0 - 8.0

Soil Toxicity Tolerance
Tolerates Serpentine Soil

Fast, Medium, Slow

Cold Tolerance(° F)
Tolerates cold to 5° F

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

Companion Plants
Use with other annuals or perennial herbs such as Clarkia sp., California Poppy (Eschscholzia californica), and Tidy Tips (Layia platyglossa)

Wildlife Attracted
A variety of birds are attracted to the seeds, including California Quail

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

Moderately Popular

Max. Summer Water ?
No Summer Water
Keep moist

Propagation ?
For propagating by seed: Fresh seeds need no treatment. Stored seeds scarification or hot water; No treatment may give fair germination.

Common uses
Bird Gardens, Bee Gardens

Nursery Availability
Sometimes Available

Other Names
Common Names
Blunt-leaved Lupine, Truncate-leaf Lupine

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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