Wild Lupine

Plants of the Eloise Butler Wildflower Garden
The oldest public wildflower garden in the United States

Common
Name

Scientific
Name

Plant
Family

Garden
Location

Prime
Season

Wild Lupine
Lupinus perennis L.
Pea (Fabaceae)
Upland
Late Spring
Other names and notes

(Sundial). Wild Lupine is a native erect perennial growing from 8 to 24" high on stems that are light green to reddish green and have thin grayish-white hair. Branching, if any, is tightly compact and usually on older plants. Leaves are alternate on long stems and are palmately divided into 7 to 11 oblanceolate leaflets and occur below the inflorescence. (Bigleaf Lupine has 11 to 17). Each leaflet has a smooth margin with fine hair and the midrib extends just beyond the tip forming a bristly tip. The upper surface is green and smooth while the lower is paler due to fine grayish-white hair. Leaflets are sessile but can rotate to track the sun. The leaf stalk is up to 4" long, green to reddish-green and hairy. Flowers: The inflorescence is a tall raceme rising above the leaves bearing numerous flowers that can vary in color from blue (the normal) to pinkish to white. Like the stem, the raceme can be green to reddish-green. Individual flowers have 5 petals, several stamens and a single style on the pistil. The flower calyx is light green to reddish in color forming a tube with two large lobes. Flower petals follow the pea structure with a large upper petal called a banner and two side wings that come forward to enclose what is called the keel. The banner turns backward at the sides. As the flower ages the banner becomes white in the center. Young flowers have a floral bract at the base that disappears with age. Fruit: Flowers mature into oblong, flattened hairy pods that have 2 or more seeds (usually up to 7). These are dispersed from the pod which splits along two lines into spiral coils that eject the seeds.

Habitat: Wild Lupine is a long-lived nitrogen fixing plant that grows from a taproot which penetrates the soil to a great depth. It propagated by offsetting rhizomes from the root and by seed. It is a cool season plant so it dies down in the heat of summer and some years may not put up a stem. Cold stratification and scarification is necessary for seed germination. The plant prefers well-drained sandy soils, slightly acidic, in full sun, partial shade tolerated. Names: The genus name means 'wolf' from the old belief that the plant robbed the soil of nutrients, when in fact the opposite is true. The alternate common name of Sundial refers to the leaflet's ability to rotate up to 90 degrees to face the sun.

Wild Lupine flower Wild Lupine Plant
Above: Note the upper petal forms a banner and two lower petals come forward forming a 'keel'. Stem and flower stalk have grayish-white hair.
Wild Lupine leaf
Above and Below: Leaves are all below the inflorescence. Each divided leaf has 7 to 11 leaflets with fine hair on the margins and a bristly tip formed by the midrib extending just beyond the tip. Below: Seed pods are flattened, hairy, with 2 or more seeds.
Wild Lupine Wild lupine leaves Wild Lupine Seed pod
Below: An historical photo of Lupine in the new Upland Garden. Photo from a Kodachrome taken by Martha Crone on May 31, 1946. Photo courtesy Minnesota Historical Society, Martha Crone Collection.
 
Lupines in the Garden  

Notes: Wild Lupine is not indigenous to the Garden. Eloise Butler first introduced the plant on May 3, 1914 with plants from Gillett's Nursery in Southwick, MA. Martha Crone noted it in bloom in 1939 and it was present at the time of her 1951 Garden census and had been planted again when the Upland Garden was developed following its addition to the Garden acreage in 1944. It is also on the 1986 Garden census and present when these photos were taken in 2012. Wild Lupine is found in the North America in the eastern half of the northern U.S. from Minnesota and Iowa eastward to the coast, excepting Missouri, Arkansas and Tennessee. It is not native to Canada but has been introduced. In Minnesota it has been found in a small strip of counties running from Cass and Crow Wing in the north diagonally southeastward to Fillmore and Houston. This includes only Hennepin, Ramsay, Anoka and Washington in the metro area. A close relative, Bigleaf lupine, Lupinus polyphyllus Lindl., is found only outside of that area in 4 NE counties.

Toxic: All wild lupines have toxic properties, primarily due to the lupin alkaloids in the foliage and seeds.

The Wild Lupine in Wisconsin is the larval host plant of the endangered Karner blue butterfly. Years ago Aldo Leopold wrote in Sketches Here and There: "Sometimes in June, when I see unearned dividends of dew hung on every lupine, I have doubts about the real poverty of the sands. On solvent farmlands lupines do not even grow, much less collect a daily rainbow of jewels. If they did, the weed-control officer, who seldom sees a dewy dawn, would doubtless insist that they be cut. Do economists know about lupines?"

 
 

 
References: Plant characteristics are generally from sources 1A, 32, W2, W3, W7 & W8 plus others as specifically applies. Distribution principally from Wi, W2 and 28C. Planting history generally from 1, 4 & 4a. Other sources by specific reference. See Reference List for details.  
©2013 Friends of the Wild Flower Garden, Inc. Text and photos are by G. D. Bebeau unless otherwise credited. "www.friendsofthewildflowergarden.org" 121213