| 1 | Lower leaves with fimbriate margin |
| 1' | Lower leaves without fimbriate margin |
| 2 | Inflorescence a panicle; at least some partial peduncles 3- or more-flowered |
| 2' | Inflorescence a raceme; partial peduncles 1- or 2-flowered |
| 3 | Lower pitchers urceolate; lid narrow, without glands |
| 3' | Lower pitchers globose-cylindrical; lid round, with glands |
| 4 | Partial peduncles with a bract, lid glands small, numerous |
| 4' | Partial peduncles without a bract, lid glands large, few |
| 5 | Stems triangular, leaf bases decurrent to 2 angles |
| 5' | Stems rounded, leaf bases decurrent or not |
| 6 | Peristome lacking teeth; pitcher with 2 ‘eye-spots’ |
| 6' | Peristome with teeth on inner margin; pitcher without ‘eye-spots’ |
| 7 | Peristome of upper pitchers with large flattened plates and large teeth |
| 7' | Peristome ribs as high as wide, lacking large plates |
| 8 | Lid with filiform, hair-like processes, especially near margin |
| 8' | Lid without such filiform processes |
| 9 | Lid with no appendages on lower surface |
| 9' | Lid with 1 or 2 appendages on lower surface |
| 10 | Upper pitchers narrow tubular below, abruptly bowl-shaped above |
| 10' | Upper pitchers infundibuliform throughout, never abruptly bowl-shaped |
