202 NORTH AMERICAN FLORA [Volume 24 



Subtribe 5. SESBANIANAE. . Trees, shrubs, or herbs, with abruptly 

 pinnate leaves, caducous stipules, and no stipels. Flowers in axillary racemes. 

 Calyx rounded-campanulate, fully as broad as high, short-lobed. Banner 

 with a broad reflexed blade, short-clawed. Keel-petals united in the middle, 

 the tips and claws distinct, the lower edge of the blades strongly curved. 

 Stamens diadelphous, the staminal sheath usually dilated below, often with a 

 basal auricle on each side. Pod 2-valved but often indehiscent, stipitate and 

 beaked, compressed, with cross-partitions between the seeds, but not articulate, 

 the valves usually separating into two layers of which the inner is papery. 

 Seeds reniform to subcylindric. 



Pod flattened or terete, neither 4-winged nor 4-angled. 



Pod 2-seeded. with thin margins, lance-elliptic; seeds oblong-reniform, 

 enclosed in the inner membranous layer of the valves; calyx de- 

 cidedly oblique. 12. Glottidium. 

 Pod many-deeded, linear, with thick margins; calyx not conspicu- 

 ously oblique. 

 Pod not torulose. 



Flowers middle-sized or small; banner suborbicular; blades 

 of the broad keel-petals with a basal auricle; seeds sub- 

 cylindric-oblong. 8. Sesban. 



Flowers large; banner elliptic; blades of the rather narrow 



keel-petals without a basal auricle; seed reniform-oblong. 9. AgaTi. 



Pod torulose; banner suborbicular; blades of the broad keel-petals 



without a basal auricle; seeds reniform-oblong. 10. Daubentoniopsis. 



Pod 4-angled, often 4-winged, not torulose. 11. Daubentonia. 



8. SESBAN Adans. Fam. PI. 2: 327. 1763. 



Sesbania Scop. Introd. 308. 1777. 

 Darwinia Raf. Fl. Ludov. 106. 1817. 



Herbs or shrubs. Leaves abruptly pinnate, the rachis ending in a setaceous point, the 

 leaflets numerous, in ours linear-oblong, obtuse or rounded and mucronate at the apex; stipules 

 small, membranous, caducous. Flowers in axillary racemes, with a bract at the base of the 

 pedicels, and a pair of bractlets below the calyx, both bracts and bractlets similar to the stipules 

 and caducous. Calyx broadly campanulate with a, turbinate base, as broad as long; lobes 

 short, deltoid, acute or acuminate, shorter than the tube. Corolla yellow or the banner dotted, 

 streaked, or tinged with purple. Banner longer than the other petals, often with one or two 

 callous appendages, the blade suborbicular, reflexed, the claw about equaling the calyx. 

 Wings short-clawed, the blades obliquely oblanceolate or oblong, with a basal auricle. Keel- 

 petals with distinct, longer claws, the blades strongly and broadly lunate, obtuse or rounded 

 at the free tips, united along the lower margins, with a basal auricle on the upper edge, the 

 claw about twice as long as the calyx. Stamens diadelphous, the staminal sheath slightly 

 auricled at the base, the free filament slightly bent below. Pod slender, terete or slightly 

 compressed, linear, neither winged or angled, short-stipitate, beaked, many-seeded, with 

 cross partitions between the seed, 2-valved. Seeds many, cylindric-oblong, slightly com- 

 pressed, subtruncate at the ends, brown and smooth, about twice as long as high. 



Type species, Aeschynomene Sesban L. 



Leaves and stem glabrous or slightly strigose when young. 



Racemes about equaling the leaves; calyx-lobes very short, triangular, 



merely acute, less than 1 mm. long. 1. S. Sesban. 



Racemes much shorter than the leaves; calyx-lobes acuminate, more than 

 1 mm. long, except in no. 3. 

 Pod 4-6 mm. broad; seeds 4-5 mm. long; corolla 18-25 mm. long. 2. 5. exasperatus. 



Pod about 3-4 mm. broad; seeds 3-4 mm. long; corolla usually less than 

 20 mm. long. 

 Stem usually with scattered small prickles; calyx-lobes acute; 



corolla 10-12 mm. long. 3. S. bispinosus. 



Stem unarmed; calyx-lobes acuminate. • 



Corolla 15-20 mm. long; plant shrubby at the base. 4. S. Emerus. 



