Amorpha confusa
Amorpha ouachitensis
savanna false indigo or indigo-bush
Ouachita false indigo, Ouachita false indigo or indigo-bush
finely longitudinally grooved and ridged, gland-dotted, strigulose to glabrate.
smooth, sparsely gland-dotted, pilosulous or glabrous.
(8–)12–20(–26) cm;
stipules sometimes persistent, linear or setaceous, (1–)1.5–2(–2.5) mm;
petiole (6–)8–15(–20) mm, gland-dotted, puberulent or glabrous;
rachis sparsely gland-dotted, puberulent or glabrous;
leaflets (11–)15–31(–35), stipels acicular or setaceous, 0.8–1.8 mm, petiolule 0.7–1.5(–1.8) mm, gland-dotted, mostly puberulent or glabrous, blade elliptic to oblong or ovate to suborbiculate, (10–)15–25(–35) × (7–)9–15(–18) mm, base truncate or round to subcordate, margins usually revolute, entire or inconspicuously crenulate, apex round to obtuse or emarginate, surfaces sparsely to conspicuously gland-dotted, usually glabrous or glabrate, sometimes sparsely pubescent abaxially;
midvein terminated by a slender mucro, (0.2–)0.4–1 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–)3–5(–8)-branched, 10–20(–30) cm;
rachis sparsely gland-dotted, puberulent;
bracteoles linear to narrowly subulate, 1.5–2.5(–3) mm, usually eglandular, sparsely pubescent or sparsely ciliate.
0.4–1 mm, eglandular, sparsely pubescent.
calyx tube turbinate to narrowly campanulate or cylindric, 1.7–2.2 mm, distal 1/3–2/3 rarely gland-dotted, glabrous;
lobes: abaxial lobe acuminate, slightly longer, adaxial lobes triangular to acuminate, 0.4–1.2(–1.5) mm, margins densely ciliate;
banner bright blue, broadly obovate to obcordate, (4–)5–6 × 3–3.5(–4) mm, distinctly clawed, margins entire or finely erose;
filaments 5–8 mm, distinct;
anthers yellow;
ovary pubescent.
sessile or stipitate, 4–5.5 × 2–2.5 mm, margins curved outward abaxially, straight adaxially, at least distal 1/2–2/3 gland-dotted, glabrous.
olive brown or brown, 2–2.3 × 1–1.5 mm, smooth, lustrous.
Amorpha confusa
Amorpha ouachitensis
Amorpha confusa is known presently only from Brunswick and Columbus counties; it is believed to be extirpated in adjacent South Carolina. The taxon is a Federal species of concern and is listed as threatened in North Carolina. It is usually encountered growing in loamy soils, most often of the Foreston soil series.
(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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