Crotalaria sagittalis.-----Family, Pulse. Color, yellow. Corolla, papilionaceous, the standard large, broad, heart-shaped. Of the 10 united stamens, 5 have larger anthers than the others. The pistil protrudes. Pods, at first green, then turning black, becoming hard and brittle. The dry seeds rattle in the pod, whence the common name. Leaves, simple, oblong, acute, nearly sessile. Stipules, present, inversely arrow-shaped at base, so formed by running down on the stem. June to September.