Amorpha paniculata
Amorpha ouachitensis
panicle false indigo, panicle false indigo or indigo-bush
Ouachita false indigo, Ouachita false indigo or indigo-bush
longitudinally grooved and ridged, eglandular, mostly puberulent, canescent, or tomentose, sometimes glabrate.
smooth, sparsely gland-dotted, pilosulous or glabrous.
(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.
7–23 cm;
stipules lanceolate, 3–4 mm, eglandular, glabrous except with villous tuft apically;
petiole 10–17 mm, gland-dotted, sparsely pubescent to
(1–)5–12-branched, paniculiform, (5–)15–30(–40) cm;
rachis eglandular, short-pilose;
bracteoles linear, 1–2 mm, eglandular, short-pilose.
1–2 mm, eglandular, short-pilose.
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.
sessile, 4–6(–8) × 2–2.5 mm, margins curved outward abaxially, bent outward adaxially, gland-dotted, glabrous.
reddish brown, 3–3.5 × 1.5–1.8 mm, smooth.
Amorpha paniculata
Amorpha ouachitensis
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.)
glabrate or glabrous; rachis sparsely gland-dotted, sparsely puberulent or glabrous; leaflets (7–)9–13(–17), stipels acicular, 1.2–2.2 mm, petiolule 2–3(–4) mm, usually sparsely gland-dotted, rarely eglandular, pilosulous to glabrate or glabrous, blade broadly elliptic to broadly oblong, (12–)25–40(–70) × (9–)15–25(–35) mm, base round, margins flat, entire or slightly crenulate, apex often emarginate, sometimes round to truncate, surfaces gland-dotted, puberulent to glabrate or glabrous; midvein terminated by a swollen mucro, 0.2–0.6 mm. Racemes 1–4-branched, (8–)10–20 cm; rachis sparsely gland-dotted or eglandular, puberulent or glabrous; bracteoles narrowly oblong, 1–1.5 mm, glabrous except margin stiffly hairy. Pedicels 1–1.5 mm, eglandular, puberulent to glabrate or glabrous. Flowers: calyx tube narrowly conical to funnelform, 2.8–3.2 mm, distal 1/4 not obviously gland-dotted, puberulent to glabrate or glabrous; lobes mostly round, 0.4–0.9(–1.2) mm; banner purple, obcordate, 5–7.5 × 4.5–6 mm, not clawed, margins entire, apex emarginate; filaments 8–10 mm, connate basally 3–6 mm; anthers yellow; ovary usually glabrous. Legumes sessile, 7–9 × 3–4 mm, margins curved outward abaxially, straight or sharply bent adaxially, at least distal 1/2 gland-dotted, usually glabrous. Seeds dark brownish to blackish, 4–5 × 2.5–3 mm, smooth.
Amorpha ouachitensis is listed as a species of concern by the states of Arkansas and Oklahoma; it is in the Center for Plant Conservation’s National Collection of Endangered Plants.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
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