Cleome ornithopodioides
Sp. Pl. 2: 672. 1753.
Annuals, 15–60 cm. Stems unbranched or sparsely branched; glandular-pubescent. Leaves: stipules absent; petiole (0.6–) 1.5–4.5 cm; leaflets 3 proximally, 1 distally, blade linear to elliptic, 0.5–3 × 0.1–0.7 cm, margins entire, apex acute to obtuse, surfaces stipitate-glandular throughout (sparingly hairy abaxially). Racemes 1–3 cm (6–15 cm in fruit); bracts mostly unifoliate, sometimes proximalmost trifoliate, 2–15 mm. Pedicels 7–15 mm. Flowers: sepals greenish with purplish margin, deltate, 0.6–2 × 0.8–1.2 mm, margins denticulate, glabrous; petals whitish or yellow, sometimes red-striped, oblong to ovate, 3–4 × 1.5–2 mm; stamens reddish, 5–6 mm; anthers 0.6–0.9 mm; gynophore (1–) 3–5 mm in fruit (subtended by clavate, purple-black gland adaxially); ovary 3–6 mm; style 0.2–0.4 mm. Capsules 25–35 × 1.5–2 mm. Seeds (4–) 10–20, reddish-brown or mottled black and brown, ovoid-spheroidal, 1.2–1.5 (–1.8), not arillate, (finely papillose).
Phenology: Flowering summer.
Habitat: Railroad yards, ore piles (chrome, vanadium), roadsides
Elevation: 100-200 m
Distribution
Introduced; Ky., Md., Ohio, Pa., se Europe, sw Asia