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Piedmont indigo-bush, schwerin's false indigo

savanna false indigo or indigo-bush

Habit Shrubs, (1–)1.5–2.5 m; arising from compact, woody root. Shrubs, 0.3–1.4 m; arising from compact, woody root.
Stems

finely grooved, gland-dotted, puberulent.

finely longitudinally grooved and ridged, gland-dotted, strigulose to glabrate.

Leaves

(5–)8–12(–22) cm;

stipules linear to narrowly lanceolate, 3–4.5 mm, eglandular, pubescent abaxially, glabrous adaxially;

petiole (7–)10–18(–25) mm, usually eglandular, pubescent;

rachis usually eglandular, puberulent;

leaflets (7–)19–27(–29), stipels acicular, 1–2.2 mm, petiolule (0.5–)1–2 mm, gland-dotted, pilosulous to puberulent, blade usually elliptic to narrowly oblong, rarely ovate to suborbiculate, (5–)15–30(–40) × (4–)8–15(–20) mm, base truncate to subcordate, margins slightly revolute, entire or slightly crenulate, apex obtuse to round or emarginate, surfaces gland-dotted, pilose to pubescent;

midvein terminated by a swollen mucro, 0.2–0.5(–0.8) mm.

(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.

Racemes

1(or 2)-branched, (2–)4–8(–12) cm;

rachis usually eglandular, puberulent to pubescent;

bracteoles linear to narrowly lanceolate, 2–3.5 mm, pilosulous abaxially, glabrous adaxially.

(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.

Pedicels

(0.8–)1–1.5(–2) mm, eglandular, puberulent to pubescent.

0.4–1 mm, eglandular, sparsely pubescent.

Flowers

calyx tube turbinate to cylindric, 1.8–2.5 mm, distal 1/3 or less gland-dotted, pilosulous;

lobes linear to narrowly lanceolate, (1.2–)2–3.5 mm;

banner purplish, broadly obovate to obcordate, 4.5–6.5 × 3–4.2 mm, distinctly clawed, margins entire or erose;

filaments 6–8 mm, connate basally 1.5–2 mm;

anthers golden yellow;

ovary usually 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.

Legumes

sessile, 5–6.5 × 1.8–2.2 mm, margins curved outward abaxially, straight adaxially, at least distal 1/2 gland-dotted, usually glabrous.

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.

Seeds

not seen.

olive brown or brown, 2–2.3 × 1–1.5 mm, smooth, lustrous.

Amorpha schwerinii

Amorpha confusa

Phenology Flowering Apr–Jun. Flowering (May–)Jun–Jul.
Habitat Dry to moist open woodlands and forests. Pine woodlands, savannas, and road banks in outer Atlantic Coastal Plain.
Elevation 100–600 m. (300–2000 ft.) 0–50 m. (0–200 ft.)
Distribution
from FNA
AL; GA; NC; SC
[BONAP county map]
from FNA
NC; Pine woodlands; savannas; and road banks in outer Atlantic Coastal Plain
[BONAP county map]
Discussion

Amorpha schwerinii is listed as a species of special concern in Georgia and South Carolina, and as significantly rare in North Carolina.

(Discussion copyrighted by Flora of North America; reprinted with permission.)

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.)

Source FNA vol. 11. FNA vol. 11.
Parent taxa Fabaceae > subfam. Faboideae > Amorpha Fabaceae > subfam. Faboideae > Amorpha
Sibling taxa
A. californica, A. canescens, A. confusa, A. crenulata, A. fruticosa, A. georgiana, A. glabra, A. herbacea, A. laevigata, A. nana, A. nitens, A. ouachitensis, A. paniculata, A. roemeriana
A. californica, A. canescens, A. crenulata, A. fruticosa, A. georgiana, A. glabra, A. herbacea, A. laevigata, A. nana, A. nitens, A. ouachitensis, A. paniculata, A. roemeriana, A. schwerinii
Synonyms A. georgiana var. confusa
Name authority C. K. Schneider: Ill. Handb. Laubholzk. 2: 71, figs. 42l,m, 44a. (1907) — (as schwerini) (Wilbur) S. C. K. Straub: Sorrie & Weakley, J. Bot. Res. Inst. Texas 3: 154. (2009)
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