Senna marilandica

Herbs, perennial, to 0.6–2 m. Leaves mesophyllous, 12–27 cm, finely hairy; stipules caducous; extrafloral nectary 1, base of or along petiole, sessile or shortly stipitate; leaflet pairs 5–9, blades elliptic, oblong-elliptic, or lanceolate, 30–60 × 9–24 mm. Racemes usually 5–15-flowered; bracts caducous. Pedicels 9–17 mm. Flowers mono­symmetric; calyx pinkish brown; corolla yellow, longest petal 8–14 mm; androecium heterantherous, stamens 7, staminodes 3; anthers of middle stamens 2.6–3.5 mm, of abaxial stamens 4–5 mm, truncate, dehiscing by 2 pores, apical appendage 0; gynoecium incurved, ovules 20–28; ovary glabrous or slightly hairy; style incurved, not dilated. Legumes ascending, flat, curved downward, 65–110 × 7.5–11 mm, corrugated over seeds, tardily dehiscent, each seed compartment wider than long. Seeds dark reddish brown, obovoid or oblong-obovoid. 2n = 28.

Phenology: Flowering mid summer–early fall.
Habitat: Open woodlands, valley floors, creek banks, swamps, thickets, pastures.
Elevation: 0–500 m.

Distribution

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Ala., Ark., Calif., Conn., D.C., Fla., Ga., Ill., Ind., Iowa, Kans., Ky., La., Md., Mass., Miss., Mo., Nebr., N.J., N.Y., N.C., Ohio, Okla., Pa., S.C., Tenn., Tex., Va., W.Va., Wis.

Discussion

Senna marilandica is introduced in southern California.

Selected References

None.

Lower Taxa

None.