608 FABACEAE 



axillary, 1-flowered, bracted at the top : calyx usually sparingly pubescent ; tube turbinate- 

 campanulate ; lobes narrowly linear, hardly twice as long as the tube : corolla pink, 6-7 

 mm. long ; standard very faintly if at all veined : pods linear, 2-3 mm. long, straight, 

 acute. 



In dry soil and open pine woods, North Carolina. Summer. 



11. INDIGOFERA L. 



Perennial herbs or shrubs, with erect or prostrate stems. Foliage often more or less 

 densely clothed with simple 2-horned or forking hairs. Leaves alternate : blades un- 

 equally pinnate, or sometimes 3-foliolate or rarely 1-foliolate : leaflets with entire blades. 

 Flowers perfect, in axillary spikes or racemes. . Calyx -lobes oblique, nearly equal or the 

 upper shorter. Corolla often pink or purple : standard broad ; blade sessile or clawed, 

 persistent : wings somewhat elongated, slightly cohering with the more or less inflated 

 erect keel and deciduous like it. Stamens 10, usually monadelphous, or one partially dis- 

 tinct. Anthers alike. Ovary sessile or nearly so. Style glabrous. Ovules numerous or 

 rarely few or solitary. Pod linear to subglobose, angled or turgid. Seeds subglobose or 

 flattened, separated from each other. INDIGO-PLANT. 



Racemes surpassing the subtending leaf-like bracts. 



Pods about 1 cm. long or shorter, oblong. 1. 1. Caroliniana. 



Pods 1.5-3 cm. long, linear. 



Pods curved. 2. L subulata. 



Pods straight. 



Standard 8-10 mm. long : racemes many-flowered : campestrian species. 3. I. leptosepala. 

 Standard 5-6 mm. long : racemes few-flowered : Floridian species. 4. /. miniata. 



Racemes shorter than the subtending leaf-like bracts. 



Pods straight or nearly so, over 2 cm. long. 5. L tinctoria. 



Pods strongly curved, less than 2 cm. long. 



Leaflets copiously pubescent above. 6. /. Lindheimeriana. 



Leaflets glabrous above or nearly so. 7. L Anil. 



1. Indigofera Caroliniana Walt. Foliage minutely strigillose. Stems erect, 1-2 m. 

 tall, widely branched : leaflets 9-15, the blades oblong, oval or oblanceolate, thinnish, 

 1-2.5 cm. long, mucronate, slender-stalked : racemes surpassing the leaf-like bracts : calyx 

 densely strigillose ; lobes triangular, acute, shorter than the tube : corolla yellowish brown ; 

 standard 5-6 mm. long, surpassed by the other petals : pods oblong, 5-10 mm. long, acute 

 at each end, drooping on short reflexed pedicels. 



In dry pine lands, North Carolina to Florida. Spring and summer. 



2. Indigofera subulata Vahl. Foliage sparingly strigillose. Stems branched at the 

 base, the branches spreading or decumbent, 2-6 dm. long, more or less branched : leaflets 

 3-5, the blades oval or oblong to obovate, 0.5-1.5 cm. long, mucronulate, short-stalked : 

 racemes surpassing the leaf -like bracts : calyx pubescent ; lobes subulate, much longer than 

 the tube : corolla pale, often pinkish ; standard 4-5 mm. long : pods linear, 3-4 cm. long, 

 acute, slightly curved. 



In sand, Florida Keys. Throughout the year. 



3. Indigofera leptosepala Nutt. Foliage strigillose. Stems more or less branched 

 at. the base, the branches decumbent, 3-10 dm. long, simple or branching : leaflets 7-9, the 

 blades oblong-obovate to cuneate, 1-2 cm. long, mucronate, sessile or nearly so : racemes 

 surpassing the leaf-like bracts: pedicels stout, 1-1.5 mm. long, finally recurved: calyx 

 strigillose ; lobes subulate, much longer than the tube : corolla pale scarlet ; standard 8-10 

 mm. long : pods linear, 3-3.5 cm. long, not torulose, straight. 



In dry soil, Kansas to Georgia and Florida, Texas and Mexico. Spring to fall. 



4. Indigofera miniata Ortega. Foliage densely strigillose with whitish hairs, conse- 

 quently pale. Stems more or less freely branched at the base, the branches spreading or 

 procumbent : leaflets firm, 5-9, the blades linear-oblong to narrowly oblanceolate, 0.5-1 

 cm. long, acute, short-stalked : racemes surpassing the leaf-like bracts : calyx closely 

 pubescent ; lobes lanceolate-subulate, longer than the tube : corolla pinkish or reddish ; 

 standard 5-6 mm. long : pods oblong-linear, 1.5-2 cm. long, acute, not torulose, straight. 



In sand, southern peninsular Florida and the Keys. Throughout the year. 



5. Indigofera tinctoria L. Foliage strigillose. Stems erect, 1-2 m. tall, branch- 

 ing: leaflets 7-11, the blades oblong, oval or obovate, 1-2.5 cm. long, mucronulate: 

 racemes shorter than the leaf-like bracts : pedicels 1-1.5 cm. long, finally recurved : calyx 

 pubescent ; lobes subulate, the lower ones surpassing the tube in length : corolla rose or 

 purplish ; standard, 4-5 mm. long : pods linear, 2. 5-3 cm. long, straight or slightly curved, 

 torulose. 



In waste places, North Carolina to Florida and Louisiana. Introduced from Asia. Summer. 



