1 | Petiole conspicuously alate; corolla orange (or yellow sometimes white) with a dark purple, glandular spot in throat |
1' | Petiole naked; corollas not colored as above, lacking glandular spot in throat |
2 | Erect to arching shrub; leaves, 2-5.5 cm long, acute to attenuate at base |
2' | Woody or herbaceous vines; leaves more than 5.5 cm long or, if less, then truncate to subcordate at base |
3 | Calyx with 12-17 subulate lobes; corolla white, 30-40(-50) mm long, externally pubescent |
3' | Calyx annular, unlobed; corolla light purple, lavender or white with a yellowish throat, 60-80 mm long, externally glabrous |