 The leaf stipules are lanceolate, acute; they fall soon after the leaf expands.The flowers are pale to bright yellow, rarely orange or reddish, with four ribbon-shaped petals long and four short stamens, and grow in clusters; flowering begins in about mid-fall and continues until late fall.The flower calyx is deeply four-parted, very downy, orange brown within, imbricate in bud, persistent, cohering with the base of the ovary.