Roemer's Indigo Bush

Amorpha texana Buckl. Proc. Acad. Phila. 1861: 452. 1862
Amorpha fruticosa var. [1] A. Gray. Bost. Jour. Nat. Hist. 6: 174. 1850. ? Amorpha laevigata pubescens A. Gray, PI. Wright. 1: 49. 1852. Amorpha subglabra A. Heller, Bot. Expl. Texas 48. 1895. Amorpha texana mollis F. Boynton, Biltmore Bot. Stud. 1: 139. 1902.
A branching shrub, 1-3 m. high; branches sparingly pubescent or glabrous; leaves 8IS cm. long, spreading; petioles about 2 cm. long; leaflets 7-13, subcoriaceous, broadly oval to elliptic, 1-3 cm. long, 8-25 mm. wide, rounded or emarginate at each end, reticulate, glabrous and shining above, sparingly pilose or glabrous (A. subglabra) and paler beneath; petiolules 3-4 mm. long; racemes 2-4 together, or solitary, 5-15 cm. long; pedicels about 1 mm. long; calyx 3-4 mm. long, pilose; upper two lobes rounded, 0.5 mm. long, the three lower ones triangular, acute, the lowest one the longest; banner blue, suborbicular-spatulate, about 7 mm. long; pod 7 mm. long and 3 mm. broad, nearly straight on the upper side, conspicuously glandular-dotted.
Type locality: On Pierdenalis River, Texas.
Distribution: Central and eastern Texas.

Perennial, Shrubs, Stems woody below, or from woody crown or caudex, Plants with rhizomes or suckers, Nodules present, Stems erect or ascending, Stems less than 1 m tall, Stems 1-2 m tall, Stems greater than 2 m tall, Stems solid, Stems or young twigs sparsely to densely hairy, Stem hairs hispid to villous, Leaves alternate, Leaves petiolate, Stipules inconspicuous, absent, or caducous, Stipules membranous or chartaceous, Stipules setiform, subulate or acicular, Stipules deciduous, Stipules free, Leaves compound, Leaves odd pinnate, Leaf or leaflet margins entire, Leaflets alternate or subopposite, Stipels present at base of leaflets, Leaflets 5-9, Leaflets 10-many, Leaves glandular punctate or gland-dotted, Leaves glabrous or nearly so, Leaves hairy on one or both surfaces, Inflorescences racemes, Inflorescences spikes or spike-like, Inflorescence axillary, Bracts very small, absent or cad ucous, Flowers zygomorphic, Calyx 5-lobed, Calyx hairy, Corolla reduced to 1 petal, Petals separate, Petals clawed, Petals blue, lavander to purple, or violet, Banner petal ovoid or obovate, Stamens 9-10, Stamens monadelphous, united below, Stamens long exserted, Filaments glabrous, Anthers versatile, Style terete, Fruit a legume, Fruit unilocular, Fruit indehiscent, Fruit elongate, straight, Fruit oblong or ellipsoidal, Fruit exserted from calyx, Fruit glabrous or glabrate, Fruit gland-dotted or with gland-tipped hairs, Fruit 1-seeded, Seeds ovoid to rounded in outline, Seeds cordiform, mit-shaped, notched at one end, Seed surface smooth, Seeds olive, brown, or black.