Nuttallia pedata Nuttall ex Hooker, Exot. Fl. 3: 172, plate 172. 1827; Callirhoe digitata Nuttall var. stipulata Waterfall

Plants perennial. Stems (1–)2–5(–15), erect to weakly erect, 1.5–9 dm, essentially glabrous, but often with trace of simple or 4-rayed stellate hairs, glaucous. Leaves: stipules persistent, linear-lanceolate to subulate, 4–12.5(–15) mm; petiole 3.5–16 cm; blade cordate, suborbiculate, or ovate, crenate or 3–5-lobed, 2.5–8(–16) × 2.5–8(–14) cm, surfaces sparsely hairy with simple hairs abaxially, glabrate adaxially, lobes oblanceolate to obtrullate. Inflorescences racemose; involucellar bractlets absent. Flowers bisexual, rarely functionally pistillate; calyx lobes valvate in bud, forming apiculate or acuminate point; petals reddish purple without white basal spot, rarely white or intergrading shades of pink, 1.6–3.2 cm. Schizocarps 6–7.5 mm diam.; mericarps 10–16, 2.5–3 × 2.5–3 mm, glabrous or with simple, appressed hairs, indehiscent; beaks prominent or not, 0.7–1.2 mm; collars absent or very weakly developed. 2n = 28.

Flowering spring–summer. Open oak or oak-pine woods, mesquite woodlands, margins of woods, prairies, roadsides; 100–500 m; Ala., Ark., Ga., Ill., Okla., Tex.

Callirhoe pedata is variable with respect to indument, leaf size and shape, and mericarp shape; it is perhaps most closely related to C. alcaeoides, with which it intergrades in Oklahoma. In population samples, flowers of C. pedata are usually bisexual, and rarely functionally pistillate. Callirhoe pedata frequently is confused with C. digitata. Callirhoe pedata is introduced in Alabama, Georgia, and Illinois.