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Conserving and restoring
America's native plants |
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CPC National Collection Plant Profile
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Thermopsis macrophylla
| Family: |
Fabaceae (Bean Family) |
| Common Names: |
Santa Ynez false lupine, Santa Ynez goldenbanner |
| Taxon Synonyms: |
Thermopsis macrophylla var. agnina, Thermopsis macrophylla var. macrophylla |
| Author: |
Hook. & Arn |
| Growth
Habit: |
Perennial |
| CPC
Number: |
15994 |
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| Photographer:
Dieter Wilken |
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| Photographer:
Dieter Wilken |
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| Primary
custodian for this plant in the CPC National Collection of Endangered
Plants is: |
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| Dieter Wilken, Ph.D. contributed to this Plant Profile. |
Thermopsis macrophylla
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Fewer than 2500 plants survive within a relatively narrow band about 3 miles long along the crest of the central Santa Ynez Mountains in Santa Barbara County, California. Current populations consist of plants similar in age and may be several decades old, because seeds germinate only after historically infrequent fires. Plants are the largest in the genus Thermopsis, are up to 1 meter wide, and are up to 2 meters tall when in full bloom. Leaves appear in the late winter, forming large clusters near the base. Each plant may produce up to 10 flowering stalks, each bearing between 90 and 100 flowers that are 2 cm long. (Chen et al. 1994)
| Distribution
& Occurrence |
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State Range
Habitat
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Open sites on gravelly to rocky substrates derived from sandstone at an altitude of 1000 - 1400 meters. Common chaparral associates include Adenostoma fasciculatum, Arctostaphylos glandulosa, and Ceanothus leucodermis. Populations occur on open sites that experience wet winters, hot summer days, and foggy summer nights. |
Distribution
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Santa Ynez Mountains, Santa Barbara County, California |
Number Left
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Single individuals and colonies consisting of 3-150 plants are dispersed as patches within a narrow, oblong area about 3 miles long. The number of plants are estimated to be between 2,000 and 2,500. A small disjunct population of less than 10 plants occurs about 15 miles distant in the same mountain range. Reports of other plants in the Santa Ynez Mountains have not been substantiated by recent surveys, and reports from other mountain ranges in California are based on misidentifications. |
State/Area
Protection
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State/Area |
Rank |
Status |
Date |
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California |
S1.3 |
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| Conservation,
Ecology & Research |
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Ecological
Relationships
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• Life history and population structure appear related to recurrent fires (Borchert 1989). Plants possess subterranean buds that survive chaparral fires.
• The seeds have exceptionally hard coats and do not germinate unless they have been scarified and/or heated to temperatures of 80 degrees Centigrade.
• Plants are self-compatible, and are actively visited by bumblebees and carpenter bees (Wilken pers. obs.).
• Each fruit produces a full complement of 6-8 seeds, which are dispersed passively. Because large plants often produce several inflorescences, each with as many as 100 flowers, a substantial seed bank can be expected in close proximity. However, Borchert (1989) found low rates of recruitment and establishment from seed during 8 years following a controlled burn. |
Threats
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• Habitat disturbance and loss of plants along roads and off-road mountain bike trails.
• Proposed 300-foot-wide fire break.
• Potential perturbation of natural fire cycles.
• Competition at seedling stage from annual exotic grasses.
• Damage to plants by illegal off-highway vehicles and trail bikes. |
Current Research Summary
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• Studies are being conducted by the Santa Barbara Botanic Garden on germination rates following short-term cold storage.
• Populations are monitored annually to estimate numbers, reproductive rates, and pollinator visitation. |
Current Management Summary
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All known plants occur on lands managed by the Los Padres National Forest. Parking along the road in the vicinity of plants is limited or restricted, and motorized off-highway vehicles are prohibited. |
Research Management Needs
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• Genetic analysis within and among populations.
• Ecological factors determining successful establishment of plants from seeds.
• A management plan that increases the number of plants and ensures stable population structure. |
Ex Situ Needs
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Additional collections of seeds, segregated by maternal plants, representing the entire geographic distribution. |
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| Books (Sections)
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| Kartesz, J.T. 1999. A synonymized checklist of the vascular flora of the U.S., Canada, and Greenland. In: Kartesz, J.T.; Meacham, C.A., editors. Synthesis of the North American Flora, Version 1.0. North Carolina Botanical Garden. Chapel Hill, NC. |
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| Electronic Sources
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| CalPhotos. (2002). CalPhotos: Berkely Digital Library Project. University of California, Berkeley. http://elib.cs.berkeley.edu/photos/. Accessed: 2002. |
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| CDFG. (2002). California's Plants and Animals, Threatened and Endangered Plants. List and Species Accounts. California Department of Fish and Game, Habitat Conservation Planning Branch. http://www.dfg.ca.gov/hcpb/species/t_e_spp/teplant/teplanta.shtml. Accessed: 2002. |
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| Journal Articles
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| Borchert, M. 1989. Postfire Demography of Thermopsis macrophylla H & A var. agnina J.T. Howell (Fabaceae), a Rare Perennial Herb in Chaparral. American Midland Naturalist. 122, 1: 120-132. |
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| Chen, C.J.; Mendenhall, M.G.; Turner, B.L. 1994. Taxonomy of Thermopsis (Fabaceae) in North America. Annals of the Missouri Botanical Garden. 81, 4: 714-742. |
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| Theses
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| Mendenhall, Meghan Glynnis. 1994. Phylogeny of Baptisia and Thermopsis (Leguminosae) as inferred from chloroplast DNA and nuclear ribosomal sequences, secondary chemisty, and morphology (Ribosomal DNA). [Ph.D. Thesis]: The University of Texas at Austin. Austin, TX. 273p. |
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