The lupine is another of those interesting plants which go to sleep at night. Some members of the genus erect one half of the leaf and droop the other half until it becomes a vertical instead of the horizontal star it is by day. Frequently the leaflets rotate as much as 90 degrees on their own axes. Some lupines fold their leaflets, not at night only, but during the day also there is more or less movement in the leaves. Sun dial, a popular name for the wild lupine, has reference to this peculiarity. The leaf of our species shuts downward around its stem, umbrella fashion, or the leaflets are erected to prevent the chilling which comes to horizontal surfaces by radiation, some scientists think. "That the sleep movements of leaves are in some manner of high importance to the plants which exhibit them," says Darwin, "few will dispute who have observed how complex they sometimes are." CANADIAN or SHOWY TICK-TREFOIL (Meibomia Canadensis; Desmodium Canadense of Gray) Pea family Flowers - Pinkish or bluish purple, butterfly-shaped, about 1/2 in. long, borne in dense, terminal, elongated racemes. Stem; Erect, hairy, leafy, 2 to 8 ft. high. Leaves: Compounded of 3 oblong leaflets, the central one largest; upper leaves nearly seated on stem; bracts, conspicuous before flowering, early falling off. Fruit: A flat pod, about 1 in. long, jointed, and covered with minute hooked bristles, the lower edge of pod scalloped; almost seated in calyx. Preferred Habitat - Thickets, woods, riverbanks, bogs. Flowering Season - July-September. Distribution - New Brunswick to Northwest Territory, south to North Carolina, westward to Indian Territory and Dakota.