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Roemer's false indigo

Piedmont indigo-bush, schwerin's false indigo

Habit Shrubs, 1–3 m; arising from compact, woody root. Shrubs, (1–)1.5–2.5 m; arising from compact, woody root.
Stems

smooth, gland-dotted, puberulent or glabrous.

finely grooved, gland-dotted, puberulent.

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.

(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.

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(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.

Pedicels

1–1.5 mm, eglandular, puberulent.

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

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 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.

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

Seeds

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

not seen.

Amorpha roemeriana

Amorpha schwerinii

Phenology Flowering Apr–Jun. Flowering Apr–Jun.
Habitat Grasslands and open woodlands on limestone soils. Dry to moist open woodlands and forests.
Elevation 400–800 m. (1300–2600 ft.) 100–600 m. (300–2000 ft.)
Distribution
from FNA
TX; Mexico (Coahuila)
[BONAP county map]
from FNA
AL; GA; NC; SC
[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 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.)

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. paniculata, A. roemeriana
Synonyms A. texana
Name authority Scheele: Linnaea 21: 461. (1848) C. K. Schneider: Ill. Handb. Laubholzk. 2: 71, figs. 42l,m, 44a. (1907) — (as schwerini)
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