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1 Floating aquatic with swollen, inflated stems |
1 Terrestrial, prostrate or upright, stems not inflated. |
..2 Prostrate perennial; leaves with 3-19 leaflets; stipules basifixed; loment articles separated by a joint and also an isthmus; calyx campanulate; [of dry, sandy or of disturbed areas]. |
..2 Erect or ascending annual; leaves with 21-51 or more leaflets; stipules peltate or medifixed; loment articles separated by only a joint; calyx bilabiate; [of moist to wet habitats]. |
....3 Leaflets with 2-4 longitudinal nerves; mature fruit stipe 1.5-3 mm long |
....3 Leaflets with 1 longitudinal nerve; mature fruit stipe 4-25 mm long; [section Aeschynomene]. |
......4 Loment sinuses notched relatively symmetrically on either side, to about 2/3-3/4 the width of the segment; [FL peninsula] |
......4 Loment sinuses either notched asymmetrically, or not notched as deeply; [collectively widespread] |
........5 Mature fruit stipe 12-25 mm long; corolla (10-) 12-15 mm long; fruit segments 5-7 mm long, 4.5-6.5 mm wide; paired bracts subtending each flower toothed (rarely entire); standard greenish-yellow with distinct dark-red veins; leaflets 6-25 mm long, 2-5 mm wide |
........5 Mature fruit stipe 4-8 (-10) mm long; corolla 7-13 (-15) mm long; fruit segments 4-6 mm long, 3.5-6 mm wide; paired bracts subtending each flower toothed or entire; standard pale orange or reddish-orange, the veins usually indistinct; leaflets 2.5-25 mm long, 1-4 mm wide. |
..........6 Paired bracts subtending each flower entire (rarely toothed); leaflets 2.5-13 mm long, 1-2.5 mm wide; fruit segments 4-5 mm long, 3.5-5 mm wide |
..........6 Paired bracts subtending each flower toothed (rarely entire); leaflets 6-25 mm long, 1.5-4 mm wide; fruit segments 5-6 mm long, 5-6 mm wide |
1 Flowers nearly regular; stamens 5-10, separate; [subfamily Caesalpinioideae, tribe Cassieae]. |
..2 Leaflets 5-25 pairs, each leaflet 0.5-1.5 cm long; stipules persistent, striate |
..2 Leaflets (2-) 3-12 pairs, each leaflet 1.5-12 cm long; stipules caduceus, small, not striate |
1 Flowers papilionoid; stamens diadelphous or monadelphous; [subfamily Faboideae]. |
....3 Tendrils lacking on all leaves; stamens monadelphous or diadelphous. |
......4 Leaflets 2 per leaf; [tribe Aeschynomeneae] |
......4 Leaflets 4-60 per leaf. |
........5 Floating aquatic with stems swollen, inflated |
........5 Terrestrial plants with stem not swollen |
..........6 Leaflets 20-60 per leaf; strong herbs (or woody) 1-4 m tall, simultaneously erect, > 1 m tall, and with stems usually > 5 mm in diameter |
............ 7 Fruit a loment, with single-seeded segments separated by sutures; stamens monadelphous or diadelphous in 2 phalanges of 5; [tribe Aeschynomeneae] |
............ 7 Fruit a legume; stamens diadelphous; [tribe Sesbanieae] |
..........6 Leaflets 4-18 per leaf; weak or sprawling herbs to 1.5 m long, with weak stems usually < 5 mm in diameter (or if thicker, then < 1 m long; stamens monadelphous or diadelphous. |
............ ..8 Leaflets 4 per leaf; stamens monadelphous; [tribe Dalbergieae] |
............ ..8 Leaflets 4-16 per leaf; stamens monadelphous, diadelphous (9 and 1, or 5 and 5) |
............ ....9 Stamens monadelphous or diadelphous in 2 phalanges of 5 and 5; [tribe Aeschynomeneae] |
............ ....9 Stamens diadelphous (9 and 1); [tribe Fabeae] |
....3 Tendrils present in the terminal position on some or all leaves; stamens diadelphous; [tribe Fabeae]. |
............ ......10 Stipules foliaceous, typically larger than the leaflets |
............ ......10 Stipules smaller, typically much smaller than the leaflets. |
............ ........11 Calyx lobes 2-4× as long as the calyx tube; [rare waif] |
............ ........11 Calyx lobes 1-2× as long as the calyx tube; [collectively widespread and common]. |
............ ..........12 Style stout, flattened or folded, with a dense longitudinal band of hairs longitudinally arrayed along the inner side; stems ridged, angled, or longitudinally winged; leaflets 2-6 (-8) cm long; calyx 5-12 mm long |
............ ..........12 Style slender and hair-like, terete (round in ×-section), glabrous except for a ring of short hairs just below the stigma; stems ridged or angled, but not longitudinally winged; leaflets 0.5-4.5 cm long (except larger in a few waifs); calyx 2-8 mm long (except larger in a few waifs) |