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Roemer's false indigo

panicle false indigo, panicle false indigo or indigo-bush

Habit Shrubs, 1–3 m; arising from compact, woody root. Shrubs or suffrutescent herbs, 1–3 m; arising from compact, woody root.
Stems

smooth, gland-dotted, puberulent or glabrous.

longitudinally grooved and ridged, eglandular, mostly puberulent, canescent, or tomentose, sometimes glabrate.

Leaves

(5–)10–15(–20) cm;

stipules linear, 1.5–2 mm, eglandular, puberulent;

petiole (5–)15–30 mm, gland-dotted, usually puberulent;

rachis eglandular, usually puberulent;

leaflets (7–)9–11(–15), stipels acicular, 1.2–2 mm, petiolule 2–5(–7) mm, usually gland-dotted, puberulent or glabrous, blade usually narrowly elliptic to oblong, rarely obovate to suborbiculate, (10–)25–40(–50) × (7–)15–25(–38) mm, base round, margins flat, entire or conspicuously crenulate, apex round or emarginate, surfaces puberulent abaxially, glabrate or glabrous adaxially;

midvein terminated by a slightly swollen mucro, 0.4–0.8 mm.

(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

1–3(–6)-branched, (4–)6–12(–20) cm;

rachis sparsely gland-dotted, puberulent;

bracteoles linear to narrowly lanceolate, 1.2–2.2 mm, eglandular, puberulent to short-pilose.

(1–)5–12-branched, paniculiform, (5–)15–30(–40) cm;

rachis eglandular, short-pilose;

bracteoles linear, 1–2 mm, eglandular, short-pilose.

Pedicels

1–1.5 mm, eglandular, puberulent.

1–2 mm, eglandular, short-pilose.

Flowers

calyx tube funnelform, 2.5–3.8 mm, distal 1/3 gland-dotted, short-pilose or glabrous;

lobes usually narrowly lanceolate, (0.2–)0.4–1.2(–1.4) mm;

banner purple, broadly obcordate, 5–7 × 5–6 mm, indistinctly clawed, margins entire or slightly erose;

filaments 6–10 mm, connate basally 4–6 mm;

anthers yellow;

ovary glabrous.

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, 6–7 × 2.5–3.5 mm, margins curved outward abaxially, straight or bent inward adaxially, at least distal 1/2 gland-dotted, glabrous or slightly hairy.

sessile, 4–6(–8) × 2–2.5 mm, margins curved outward abaxially, bent outward adaxially, gland-dotted, glabrous.

Seeds

brown, reddish brown, or greenish brown, 2.5–4.5 × 1.5–2 mm, smooth, not lustrous.

reddish brown, 3–3.5 × 1.5–1.8 mm, smooth.

Amorpha roemeriana

Amorpha paniculata

Phenology Flowering Apr–Jun. Flowering May–Jun.
Habitat Grasslands and open woodlands on limestone soils. Moist, acid thickets, bogs, and swamps.
Elevation 400–800 m. (1300–2600 ft.) 10–300 m. (0–1000 ft.)
Distribution
from FNA
TX; Mexico (Coahuila)
[BONAP county map]
from FNA
AR; LA; OK; TX
[BONAP county map]
Discussion

In the flora area, Amorpha roemeriana is confined to the Edwards Plateau area of central Texas, where it occurs in Bandera, Bexar, Blanco, Comal, Gillespie, Hays, Kendall, Kerr, Kinney, Medina, Travis, and Uvalde counties.

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

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. 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. schwerinii
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. roemeriana, A. schwerinii
Synonyms A. texana
Name authority Scheele: Linnaea 21: 461. (1848) Torrey & A. Gray: Fl. N. Amer. 1: 306. (1838)
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