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1 Flowers with 5 petals, 2 fused to form the keel (papilionaceous); corolla rose, yellow, orange, red, pink, or white; [subfamily Faboideae]. |
..2 Lianas climbing by twining; stamens 9, monadelphous |
..2 Shrubs; stamens 10, diadelphous (9 and 1). |
....3 Leaflet pairs 10-25; [widespread] |
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......4 Leaflets 10-25 mm long; corolla 15-20 mm long, yellow; [non-native cultivated and sparingly established] |
......4 Leaflets 3-11 mm long; corolla 8-11 mm long, pink or white; [native, s. TX] |
1 Flowers with 5 or 3 petals, all distinct (caesalpinaceous); corolla yellow, orange, red, or pink; [subfamily Detarioideae or Caesalpinioid clade]. |
........5 Large tree; sepals 4; petals 3; functional stamens 3; [subfamily Detarioideae] |
........5 Shrub or small tree (< 5 m tall); sepals 5, petals 5, functional stamens 6-10; [Caesalpinoid clade]. |
..........6 Trees; filaments of the 3 lower stamens curved; petiolar gland absent; [introduced in s. FL] |
..........6 Shrubs or trees; filaments of all stamens straight; petiolar and/or rachis gland(s) present or absent; [collectively more widespread]. |
............ 7 Leaflets 0.6-1.0 cm long, coriaceous, the venation raised-reticulate below; functional stamens 10; [s. TX] |
............ 7 Leaflets 1.5-10.5 cm long, herbaceous; functional stamens 6-7 (10 in S. surattensis); [collectively more widespread, but especially FL and s. TX] |
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) |