614 FABACEAE 



6. Robinia nana (Ell.) Spach. A shrub 2-4.5 dm. tall, with a generally simple 

 stem. Stem, peduncles and petioles more or less hispid, or nearly smooth, the young 

 twigs and foliage often sparingly pubescent, soon glabrate : leaves 1-1.5 dm. long; 

 leaflets 9-15, the blades elliptic or ovate, acute at the apex, rounded or acute at the base : 

 racemes 3-6-flowered : corolla 16-20 mm. long, purple with white : pods oblong, bristly- 

 hispid, but not as much so as that of the next preceding species. 



In dry sandy soil, at low altitudes, North and Soutn Carolina. Local. Spring. 



15. COURSETIA DC. 



Shrubs or trees, with pubescent foliage. Leaves equally or unequally pinnate : 

 leaflets several, with very small stipels, the blades entire. Flowers perfect, solitary in the 

 axils (in our species). Calyx pedicelled : lobes 5, nearly equal, the 2 upper strongly 

 united. Corolla colored, sometimes showy : standard reflexed, with an orbicular or reni- 

 form blade : wings free : keel-petals incurved. Stamens 10, diadelphous or monadelphous 

 to about the middle. Anthers all alike. Ovary sessile. Style incurved, pubescent along 

 the inner side. Stigma capitate. Ovules several. Pod narrow, 2-valved, marginless. 



1. Coursetia axillarfs Coult. & Rose. A much branched shrub or small tree, reaching 

 a height of several m., with finely pubescent young foliage. Branchlets somewhat zigzag : 

 leaves clustered, 1-2 cm. long : leaflets 7-11, the blades obovate or oblong-obovate, except 

 the orbicular or oval lower pair, bright green, reticulated, entire, minutely pubescent be- 

 neath : flowers axillary, solitary : pedicels becoming 5-10 mm. long : calyx strigillose, 4-5 

 mm. long ; tube campanulate ; lobes triangular-lanceolate or lanceolate, acute, longer than 

 the tube : corolla barely 1 cm. long ; standard reflexed, the blade about 12 mm. broad : 

 pods linear, 3-3.5 cm. long, glabrous, much constricted between the seeds, each narrowed 

 into a broad stipe. 



In dry soil, San Diego, Texas. Spring. 



16. SESBAN Adans. 



Herbs or shrubs, with upright stems. Leaves alternate, equally pinnate, with fuga- 

 cious stipules : leaflets numerous, the blades entire. Flowers perfect, few in axillary 

 racemes. Calyx pedicelled : lobes 5, nearly equal. Corolla white, yellow, red or purple : 

 standard broad, erect or reflexed : wings curved : keel-petals blunt. Stamens diadelphous 

 (9 and 1) : anthers alike or nearly so. Ovary often stalked. Style glabrous, incurved. 

 Ovules numerous. Pod elongated, flat, narrow, neither 4-angled, nor winged, septate be- 

 tween the seeds, more or less torulose, dehiscent, the walls united. Seeds numerous. 

 [Sesbania Scop.] 



1. Sesbaii macrocarpa Muhl. Annual, glabrous, often glaucous. Stems 1-4 m. tall, 

 widely branching : leaves pinnate ; leaflets 20-70, the blades oblong, 1-2. 5 cm. long, 

 mucronulate : racemes shorter than the leaves : pedicels 5-10 mm. long : calyx membra- 

 nous ; lobes triangular, acuminate, shorter than the campanulate tube : corolla yellow : 

 petals often spotted with purple ; standard with a suborbicular blade 15-20 mm. in 

 diameter : pods elongated, 1.5-3 dm. long, slightly curved, the edges thickened, the sides 

 constricted between the seeds. 



In moist soil, Pennsylvania to Missouri, Florida, Texas and Central America. Spring to fall. 



17. AGATI Adans. 



Trees, usually of rapid growth and short-lived. Leaves alternate, with lanceolate 

 stipules : blades equally pinnate : leaflets numerous, the blades entire. Flowers perfect, 

 2-4 in axillary racemes. Calyx pedicelled : tube campanulate, nearly truncate or 2- 

 lipped. Corolla ample : standard with an ovate to oblong blade : wings surpassing the 

 standard : keel-petals curved, acuminate but obtuse, distinct at the base and the apex. 

 Stamens 10, diadelphous (9 and 1), the sheath auricled at the base. Ovary short-stalked. 

 Style subulate. Ovules several. Pod elongated, rather slender, flattened, wingless, more 

 or less torulose, stipitate. Seeds several, separated by partitions. 



1. Agati grandiflora (L. ) Desv. A small tree, with finely pubescent foliage or 

 finally nearly glabrous. Leaves 1-3 dm. long, narrowly oblong in outline : leaflets numer- 

 ous, the blades oblong or linear-oblong, 2-4 cm. long, mostly truncate or retuse at the 

 apex : racemes mostly 2-4-flowered : calyx 2-2.5 cm. long, the lobes broadly triangular, 



