Lupinus truncatus is an annual herb growing no more than Script error: No such module "convert". 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 inflorescence 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.
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