|USDA Forest Service; Kurt Parker|
Varieties: Lupinus latifolius var. latifolius occurs from British Columbia south to California [45,47,60]. Lupinus latifolius var. barbatus, L. l. var. dudleyi, L. l. var. parishii, and L. l. var. viridifolius occur in California . Lupinus latifolius var. columbianus is found throughout the Intermountain West [11,45,80].ECOSYSTEMS :
Mount Rainier National Park, Washington
broadleaf lupine/American bistort (Polygonum bistortoides)
Sitka valerian (Valeriana sitchensis)/broadleaf lupine
greenleaf fescue (Festuca viridula)/broadleaf lupine
pink mountainheath (Phyllodoce empetriformis)/broadleaf lupine [32,44]
Eastern Washington national forests
broadleaf lupine 
Gifford Pinchot National Forest, Washington
coast Douglas-fir/vine maple/western fescue (Pseudotsuga menziesii var. menziesii/Acer circinatum/Festuca occidentalis) .
Blue Mountains, eastern Oregon and southeastern Washington
poke knotweed (Polygonum phytolaccifolium) 
Broadleaf lupine is a component of the vegetation in the following communities:
quaking aspen (Populus tremuloides) riparian forest 
giant sequoia (Sequoiadendron giganteum) [42,71]
Eastern Washington national forests
timber oatgrass (Danthonia intermedia)
black alpine sedge (Carex nigrans)
saw-leaved sedge (Carex scopulorum var. prionophylla)
subalpine fir/cascade azalea (Rhododendron albiflorum)/arrowleaf ragwort (Senecio triangularis)
subalpine fir/false bugbane (Trautvettaria caroliniensis)
subalpine fir/globeflower (Trollius laxus)
subalpine fir/mountain arnica (Arnica latifolia)-skunkleaf polemonium (Polemonium pulcherrimum)
subalpine fir/Labrador tea (Ledum glandulosum)-grouse huckleberry (Vaccinium scoparium)
subalpine fir/twinflower (Linnaea borealis var. longiflora) 
Crater Lake National Park, Oregon
gray alder/blue wildrye (Alnus incana/Elymus glaucus) 
western moss heather (Cassiope mertensiana)-pink mountainheath
Sitka valerian-green false hellebore (Veratrum viride)
showy sedge (Carex spectabilis)
American saw-wort (Saussurea americana)
purple monkeyflower (Mimulus lewisii) [31,32]
|© 2001 Steven Thorsted|
GENERAL BOTANICAL CHARACTERISTICS:
This description provides characteristics that may be relevant to fire ecology, and is not meant for identification. Keys for identification are available [11,38,46,47,50,59,60,80].
Broadleaf lupine is a native perennial forb. It has a bushy, densely branched growth habit originating from a woody caudex and an extensive root system . Plant heights range from 1 to 4 feet (0.3-1.2 m) on erect stems that are subglabrous to minutely strigose [59,60,80]. The leaves are palmately compound with 5 to 10 leaflets. The leaflets are elliptic to lance-shaped, 1 to 3 inches (2.5-7.6 cm) long, glabrous above, and minutely strigose beneath. The inflorescence is a showy raceme from 4 to12 inches (10-30 cm) long with numerous whorled or scattered pea-like flowers. The fruit is a legume that is 0.8 to 1.8 inches (2-4.5 cm) long and densely hairy. The legume pod contains 6 to 10 dark brown seeds [11,38,45,53,59,80].
Physiology: Broadleaf lupine is a nitrogen-fixing legume [17,61]. Seventeen years after thinning on a coast Douglas-fir site, broadleaf lupine was 1 of 2 species that accounted for only 1% of understory biomass, yet contributed 1/3rd of the nitrogen annually cycled .RAUNKIAER  LIFE FORM:
Pollination: Broadleaf lupine is insect pollinated . Bees pollinate broadleaf lupine on the Olympic National Forest, Washington .
Breeding system: There is considerable genetic variation within local populations of broadleaf lupine. Both diploid and tetraploid forms occur in some populations .
Seed production: Six to ten large seeds are produced per seed pod [39,45]. One terminal cluster can produce as many as 35 pods .
Seed dispersal: The pod splits at maturity, releasing several seeds . The seeds are large and are not dispersed widely . Dispersal is mainly by gravity and water. Seedlings generally establish within a few meters of the parent plant .
Seed banking: Some Lupinus species form a seed bank , but information is lacking for broadleaf lupine. Further research is needed in this area.
Germination: The optimal temperature for the germination of broadleaf lupine seeds in alpine tundra is 68 °F (20 °C) . The greatest percentage (~40%) of germination of broadleaf lupine seeds in a greenhouse environment occurred about 168 hours after imbibition .
Seedling establishment/growth: Seedlings have pronounced taproots, but lateral root development is limited, and only small rosettes of leaves are initially formed .
Asexual regeneration: Broadleaf lupine reproduces from root sprouts, root fragments, and from the caudex [3,4,24,25,77].
After the 1980 eruption of Mount St. Helens, studies were done on the plants that had tephra (coarse, airborne material) deposited on top of them. Broadleaf lupine's perennating buds remained on the woody caudex at the soil surface, but the stems easily penetrated up through the deposit. Subsequent seed production was substantial, and broadleaf lupine seedlings established in the tephra .SITE CHARACTERISTICS:
|California||Moist areas in shady to open woods below 11,000 feet (3,500 m) [45,59,60]|
|Nevada||Moist soils on streambanks, mountain ridges, and meadows, 5,000 to 9,000 feet (1,500-2,700 m) |
|Utah, Zion National Park||Oakbrush (Quercus spp.) and streamside communities at 4,000 feet (1,200 m) |
|Washington (eastern)||Lowland prairies to alpine ridges, also found in moist, well-drained riparian and wetland zones |
|Washington (northwest)||Open, subalpine ridges to wooded slopes and natural openings |
|Olympic National Forest, Washington||High elevation, drier environmental zones and moist subalpine meadows |
|Olympic National Park, Washington||Subalpine meadow and mesic grass communities with late snowmelt [20,64]|
|Oregon (western) and southwestern Washington||Open sites, dry to moist, lowlands to upper elevations |
|Pacific Northwest||Open, subalpine ridges to wooded slopes, occasionally on low-elevation grasslands |
Soils: Broadleaf lupine can persist in low-fertility soils because of its ability to fix nitrogen . It may increase soil fertility. On sites in the Olympic Mountains, the soils directly surrounding the nitrogen-fixing broadleaf lupine plants had twice the nitrogen, more organic matter, and more phosphorus than adjacent soils .
The 1980 eruption of Mount St. Helens provided a unique opportunity to study the growth response of broadleaf lupine on the newly deposited volcanic substrates. A greenhouse study on 4 soil samples taken from the site during the summers of 1980 and 1981 revealed that broadleaf lupine exhibited the greatest growth response on tephra and the least growth on the pyroclastics (volcanic rock fragments). Subsequent soil samples collected from 1982 and 1983 revealed a large growth response on 3 substrates (pyroclastics, mud, and tephra) .
The soil descriptions for 2 plant communities where broadleaf lupine is dominant follow.
Olympic National Forest, subalpine fir/broadleaf lupine association: Soils are shallow, coarse-textured, and very rocky. They have high permeability and low water holding capacity. Soils are cold in winter and warm in summer; the mean soil temperature for August is 54 °F (12 °C). The soil temperature regime is frigid, and the soil moisture regime is xeric. Stands in this type have burned frequently in the past, which may have contributed to the apparently low fertility of these sites. Other associations in which broadleaf lupine was a minor component have shallow, rocky soils .
Mount Rainier National Park, green fescue meadows: Soils are relatively dry, well-drained loams that are primarily derived from geologically young deposits of glacial till and volcanic ash .SUCCESSIONAL STATUS:
There was an abundance of broadleaf lupine on a pioneer community dominated by red alder (Alnus rubra) and Sitka willow (Salix sitchensis) on Bald Mountain, Vancouver Island, British Columbia . In Mount Rainier National Park, Washington, broadleaf lupine is associated with young and developing communities but is most characteristic of the "best developed" and "most mature" meadow communities . Broadleaf lupine is a dominant species in both early seral and old-growth stands of Olympic National Forest .
The rapid development of an extensive lateral root system should allow broadleaf lupine to exploit resources effectively and thus succeed in competing for water, light, and space later in succession. The presence of broadleaf lupine plants in canopy gaps of old-growth forests of coast Douglas-fir, mountain hemlock (Tsuga mertensiana), and western redcedar (Thuja plicata) confirms its ability to succeed in a strongly competitive environment .SEASONAL DEVELOPMENT:
|California||April to July [59,60]|
|Nevada||June to August |
|Olympic National Forest||June to August |
|Pacific Northwest||June to August |
Fire regimes for the mesic communities where broadleaf lupine occurs most often are mostly mixed- to high-severity with fire return intervals ranging from 35 to 200 years. In some cases, fire return intervals may be >200 years .
The following table provides fire return intervals for plant communities and ecosystems where broadleaf lupine is important. Find fire regime information for the plant communities in which this species may occur by entering the species name in the FEIS home page under "Find Fire Regimes".
|Community or Ecosystem||Dominant Species||Fire Return Interval Range (years)|
|silver fir-Douglas-fir||Abies amabilis-Pseudotsuga menziesii var. menziesii||>200|
|grand fir||Abies grandis||35-200 |
|tamarack||Larix laricina||35-200 |
|western larch||Larix occidentalis||25-350 [8,13,26]|
|Engelmann spruce-subalpine fir||Picea engelmannii-Abies lasiocarpa||35 to >200 |
|whitebark pine*||Pinus albicaulis||50-200 [1,5]|
|Rocky Mountain lodgepole pine*||Pinus contorta var. latifolia||25-340 [12,13,76]|
|Sierra lodgepole pine*||Pinus contorta var. murrayana||35-200|
|western white pine*||Pinus monticola||50-200 |
|quaking aspen (west of the Great Plains)||Populus tremuloides||7-120 [7,34,56]|
|mountain grasslands||Pseudoroegneria spicata||3-40 (x=10) [6,7]|
|Rocky Mountain Douglas-fir*||Pseudotsuga menziesii var. glauca||25-100 [7,9,10]|
|coastal Douglas-fir*||Pseudotsuga menziesii var. menziesii||40-240 [7,58,67]|
|California mixed evergreen||Pseudotsuga menziesii var. menziesii-Lithocarpus densiflorus-Arbutus menziesii||<35 |
|California oakwoods||Quercus spp.||<35|
|Oregon white oak||Quercus garryana||<35|
|western redcedar-western hemlock||Thuja plicata-Tsuga heterophylla||>200|
|western hemlock-Sitka spruce||Tsuga heterophylla-Picea sitchensis||>200|
|mountain hemlock*||Tsuga mertensiana||35 to >200 |
FIRE MANAGEMENT CONSIDERATIONS:
The current body of research provides no clear direction for using fire as a management tool for broadleaf lupine populations. The research discussed above does, however, indicate that fire has a positive influence on broadleaf lupine. Further research is need on the fire ecology of broadleaf lupine.
The importance of broadleaf lupine to Columbian black-tailed deer is relatively low .
Palatability/nutritional value: Columbian black-tailed deer on Vancouver Island, British Columbia, eat broadleaf lupine leaves casually or when under stress . Birds eat the seeds .
Cover value: No information is available on this topic.VALUE FOR REHABILITATION OF DISTURBED SITES:
Broadleaf lupine seedlings grown in a greenhouse were used for rehabilitation of Paradise Meadow in Mount Rainier National Park. The survival rate for all forbs planted in the revegetation plots averaged 94%. Broadleaf lupine and other forb species spread faster than sedges (Carex spp.). Seeding with broadleaf lupine seeds was successful on these plots . Survival of outplanted broadleaf lupine seedlings, also grown in the greenhouse, was successful after 2 years on a native plant garden (Biscuit scabland restoration) in the Columbia River Gorge, Oregon [82,83].OTHER USES:
Broadleaf lupine is not resistant to trampling, but it tolerates some trampling because of its upright growth habit and because plants regenerate rapidly from subsurface adventitious buds .Disturbance from postharvest slash treatments had little effect on broadleaf lupine cover. Six different slash treatments were done after clearcutting on a high-elevation lodgepole pine/subalpine fir forest of the Cascade Range in Washington. Treatments included a spring broadcast burn, a fall broadcast burn, piled slash burned with clear areas (high-severity burn), piled unmerchantable material, chipped slash, and no treatment. With the exception of the piled unmerchantable material, from which broadleaf lupine was absent, broadleaf lupine cover was around 4 dm²/15 m² on all treatment plots and the adjacent forest that was not harvested [72,84].
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