25. Streptanthus maculatus Nuttall, J. Acad. Nat. Sci. Philadelphia 5: 134. 1825; Erysimum maculatum (Nuttall) Kuntze, Revis. Gen. Pl. 1: 933. 1891. TYPE: U.S.A. Arkansas: near banks of the Kiamesha of Red River, Thomas Nuttall s.n. (holotype, BM!).
S. obtusifolius W. J. Hooker, Bot. Mag. t. 3317. 1834; Streptanthus maculatus subsp. obtusifolius (W. J. Hooker) Rollins, Cruciferae Continental N. Amer. 843. 1993. TYPE: no specimens at K, and the excellent plate above serves as the type.
Herbs, annual, glabrous throughout except sometimes for stem base, glaucous. Stems 1.7–10.6 dm, erect, simple or branched above, glabrous or puberulent near base with simple trichomes 0.05–0.5 mm. Basal leaves petiolate, soon withered; middle cauline leaves broadly ovate to broadly oblong or lanceolate, 2–15 x 1–8 cm, acute to acuminate or rounded at apex, entire, sessile, amplexicaul; upper leaves similar, smaller. Racemes ebracteate, dense or lax, without a terminal cluster of sterile flowers; fruiting pedicels divaricate-ascending, straight, 4–7 mm. Flowers: sepals forming campanulate calyx, erect, purplish, outer pair without or rarely with a subapical callus 0.1–0.3 mm, not keeled; petals magenta with deep purple center, 11–21 mm; blade widely spreading to somewhat reflexed, not crisped, 6–12 x 5–11 mm; claw 5–10 mm, narrower than blade; stamens tetradynamous; median filament pairs free, 5–7 mm; lateral pair 3–5 mm; anthers of all stamens fertile, 3–4 mm. Fruits 6–11.4 cm x 2–3 mm, ascending, straight, not torulose; valves glabrous, with a prominent midvein; gynophore 0.7–1.5 mm; replum straight; style 1–2.5 mm; stigma strongly 2-lobed; ovules and seeds 56–92 per fruit. Seeds broadly oblong, 2–2.5 x 1–1.3 mm; wing continuous, 0.2–0.3 mm wide.
Habitat: near creeks, roadside banks, moist bottoms, open oak woods, moist land in woods, rocky bluffs, ledges, dry talus slopes, rock crevices, pine-hickory forests.
Elevation: 200–500 m.
Distribution: United States (Arkansas, Oklahoma, Texas).