Amorpha paniculata |
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panicle false indigo, panicle false indigo or indigo-bush |
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Habit | Shrubs or suffrutescent herbs, 1–3 m; arising from compact, woody root. |
Stems | longitudinally grooved and ridged, eglandular, mostly puberulent, canescent, or tomentose, sometimes glabrate. |
Leaves | (10–)20–40 cm; stipules linear, 2–3 mm, eglandular, pubescent; petiole (20–)30–60(–90) mm, eglandular, puberulent, canescent, or tomentose; rachis eglandular, puberulent or canescent; leaflets (9–)11–19, stipels acicular, 1–2 mm, petiolule (2–)4–10 mm, sparsely gland-dotted, usually pilosulous proximally, glabrous distally, blade narrowly elliptic to oblong or ovate, 15–30(–50) × (14–)18–22(–26) mm, base round, margins flat, entire, apex round, surfaces sparsely gland-dotted abaxially, canescent to tomentose or glabrate abaxially, usually puberulent to glabrate or glabrous adaxially; veins conspicuous, distinctly raised abaxially; midvein terminated by a slender mucro, 0.5–1.8 mm. |
Racemes | (1–)5–12-branched, paniculiform, (5–)15–30(–40) cm; rachis eglandular, short-pilose; bracteoles linear, 1–2 mm, eglandular, short-pilose. |
Pedicels | 1–2 mm, eglandular, short-pilose. |
Flowers | calyx tube funnelform, 1.8–2.2 mm, distal 1/3 gland-dotted, usually short-pilose, rarely glabrate; lobes: abaxial lobe linear to narrowly lanceolate, adaxial lobes usually triangular to ovate, (1–)1.2–2 mm; banner purple, broadly obcordate, 5–7 × 3–4 mm, indistinctly clawed, margins entire or slightly erose; filaments 5–6 mm, connate basally 2.5–3 mm; anthers orange; ovary glabrous. |
Legumes | sessile, 4–6(–8) × 2–2.5 mm, margins curved outward abaxially, bent outward adaxially, gland-dotted, glabrous. |
Seeds | reddish brown, 3–3.5 × 1.5–1.8 mm, smooth. |
Amorpha paniculata |
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Phenology | Flowering May–Jun. |
Habitat | Moist, acid thickets, bogs, and swamps. |
Elevation | 10–300 m. (0–1000 ft.) |
Distribution |
AR; LA; OK; TX |
Discussion | Amorpha paniculata is listed as threatened in Arkansas and as a species of concern in Oklahoma. (Discussion copyrighted by Flora of North America; reprinted with permission.) |
Source | FNA vol. 11. |
Parent taxa | |
Sibling taxa | |
Name authority | Torrey & A. Gray: Fl. N. Amer. 1: 306. (1838) |
Web links |