Amorpha crenulata
Amorpha ouachitensis
crenulate false indigo
Ouachita false indigo, Ouachita false indigo or indigo-bush
finely longitudinally grooved and ridged, often obscurely gland-dotted, sparsely puberulent or glabrous.
smooth, sparsely gland-dotted, pilosulous or glabrous.
(8–)15–25(–30) cm;
stipules mostly acicular, 1.2–2.2 mm;
petiole (3–)8–15(–18) mm, gland-dotted, sparsely puberulent or glabrous;
rachis sparsely gland-dotted, often glabrous;
leaflets (19–)23–33(–41), stipels acicular, 0.4–1.5 mm, petiolule (1–)1.5–2(–3) mm, gland-dotted, usually glabrous, blade elliptic to oblong or ovate to suborbiculate, (7–)12–25(–42) × (2.5–)5–9(–11) mm, base obtuse to round or truncate to subcordate, margins usually conspicuously revolute, crenulate, apex obtuse to round or emarginate, surfaces gland-dotted abaxially, glabrous or glabrate;
midvein terminated by a swollen mucro, 0.2–0.5 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–)4–10-branched, (5–)10–25(–30) cm;
rachis sparsely gland-dotted, sparsely puberulent;
bracteoles linear to narrowly spatulate, 1.2–2.5 mm, gland-dotted, sparsely hairy.
(0.5–)1–1.8(–2.2) mm, gland-dotted, sparsely puberulent.
calyx tube turbinate to narrowly campanulate, (2–)2.2–3.2(–3.5) mm, distal 1/2 often gland-dotted, glabrous or glabrate;
lobes: abaxial lobe narrowly triangular, slightly longer, adaxial lobes triangular or obtuse, 0.8–1.8(–2) mm;
banner violet or white, broadly obcordate, (4.5–)5–6(–7) × 3–4.5 mm, distinctly clawed, margins entire or finely erose;
filaments 6–9 mm, distinct;
anthers yellowish;
ovary glabrous.
sessile, 4–6.5 × 1.8–2.5 mm, margins strongly curved outward abaxially, straight to slightly arched adaxially, distal 2/3 gland-dotted, glabrous.
not seen.
Amorpha crenulata
Amorpha ouachitensis
Amorpha crenulata is restricted to the Miami Rock Ridge of southeastern Florida, where about 350 individuals remain in four populations confined to Miami-Dade County. Conservation measures for this species, including an ex situ collection, restored populations, and seed bank, are overseen by Fairchild Tropical Garden in Coral Gables (for example, J. Roncal et al. 2006; K. S. Wendelberger et al. 2007).
Amorpha crenulata is in the Center for Plant Conservation’s National Collection of Endangered Plants; as A. herbacea var. crenulata, it is listed in NatureServe as a plant of concern.
(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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