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| 1 Leaves 1-foliolate, sessile or perfoliate. |
..2 Leaves perfoliate; plant glabrous or nearly so; [widespread, from s. SC southward] |
| ..2 Leaves sessile; plant glabrous or densely cobwebby pubescent; [narrow endemics of GA and FL]. |
| ....3 Plant cobwebby-pubescent; leaves ca. 1× as long as wide, cordate at base; corolla 9-11 mm long, yellow; [of e. GA (Brantley and Wayne counties)] |
| ....3 Plant glabrous; leaves 1.3-1.6× as long as wide, rounded to broadly cuneate at base; corolla 12-15 mm long, pale yellow to greenish; [of the FL Panhandle (Franklin, Gadsden, Leon, Liberty, and Wakulla counties)] |
| 1 Leaves 3-foliolate, petiolate or sessile. |
| ......4 Flowering or fruiting pedicels bracteolate; corolla 11-14 mm long |
| ........5 Calyx lobes about as long as the calyx tube |
| ........5 Calyx lobes much > the calyx tube. |
| ..........6 Plant glabrous; [of ne. FL (Clay and St. Johns counties)] |
| ..........6 Plant tomentose to hirsute; [of FL Panhandle (Escambia, Holmes, Okaloosa, Santa Rosa, and Walton counties) and s. AL (Covington County)] |
| ......4 Flowering or fruiting pedicels lacking bracteoles; corolla larger (except B. tinctoria). |
| ............ 7 Plants in flower |
| ............ 7 Plants in fruit |