| 1 | Lid with a curved, hook-like process near the base |
| 1' | Lid without a curved, hook-like process near the base, at most a swollen lump |
| 2 | Pitcher mouth lateral, pitchers urceolate |
| 2' | Pitcher mouth apical, pitchers urceolate, tubular or infundibuliform |
| 3 | Pitcher with a prominent rim of white hairs immediately below the peristome |
| 3' | Pitcher without a rim of white hairs below the peristome |
| 4 | Lid narrow, at least four times as long as broad |
| 4' | Lid broad, less than three times as long as broad |
| 5 | Pitcher globose; lid with 0-12 glands on lower surface |
| 5' | Pitcher strikingly infundibulate, widening greatly to the mouth; lid with 30 or more glands |
| 6 | Peristome lacking |
| 6' | Peristome present |
| 7 | Stem triangular and leaf bases decurrent |
| 7' | Stem rounded, or angular but then leaf bases not decurrent |
| 8 | Peristome inner margin without teeth; lid with numerous minute glands |
| 8' | Peristome inner margin with teeth; lid with < 50 large-rimmed glands |
| 9 | Margin of lower leaves fimbriate |
| 9' | Margin of lower leaves entire |
| 10 | Leaf base decurrent or adnate |
| 10' | Leaf base amplexicaul or sessile, if decurrent, then only as a ridge |
| 11 | Leaf base not narrowed to a distinct petiole |
| 11' | Leaf base narrowed to a distinct petiole |
| 12 | Lid glands minute (< 0.15 mm), numerous, throughout underside of lid |
| 12' | Lid glands large (0.3-0.5 mm), few (< 50), near base and midline, or throughout underside of lid |
| 13 | Lid ovate; glands near base and along midline only |
| 13' | Lid elliptic; glands throughout |
| 14 | Lid oblong-elliptic, apex notched |
| 14' | Lid rounded or ovate, apex rounded |
| 15 | Leaf base long decurrent into 2 ridges running almost to next axil |
| 15' | Leaf base shortly decurrent, attenuate wings to at most 2 cm long |
| 16 | Lid glands few, large (0.3-0.5 mm), near midline and base only |
| 16' | Lid glands numerous, small (< 0.3 mm), throughout centre of lid |
| 17 | Pitcher spur at least 10 mm or more long and covered by reddish hairs |
| 17' | Pitcher spur not greater than 6 mm in length, sparsely hairy |
| 18 | Peristome extended into a flattened neck; lid glands absent from centre of lid |
| 18' | Peristome not extended into a neck; glands less numerous towards margin |
| 19 | Stems rounded, < 3 mm diam.; leaves less than 13 by 2 cm |
| 19' | Stems rounded or angular, > 3 mm diam.; leaves larger than 13 by 2 cm |
| 20 | Axils with conspicuous downy indumentum |
| 20' | Axils glabrous |
| 21 | Lid oblong-elliptic; apex truncate or notched |
| 21' | Lid rounded to ovate; apex not notched |
| 22 | Inner margin of peristome entire or with short teeth < 0.3 mm long |
| 22' | Inner margin of peristome with prominent teeth, 0.4-10 mm long |
| 23 | Stem angular |
| 23' | Stem rounded |
| 24 | Leaf sessile |
| 24' | Leaf petiolate |
| 25 | Longitudinal veins arising both from base and along the length of the midrib; inner margin of peristome lacking teeth |
| 25' | Longitudinal veins all arising from base of midrib; inner margin of peristome with teeth |
| 26 | Stem angular |
| 26' | Stem rounded |
| 27 | Peristome flattened towards neck and much broader there |
| 27' | Peristome more or less even width throughout |
| 28 | Leaves of lower pitchers often very small (< 8 by 2 cm); upper leaves usually much larger (20-25 by 5 cm), lanceolate; base tapering |
| 28' | Leaves of lower pitchers (> 10 by 2 cm); upper leaves similar in size (16 by 4 cm), obovate; base parallel-sided |
| 29 | Petioles of upper leaves decurrent to stem; margin often densely pubescent |
| 29' | Petioles of upper leaves not decurrent to stem; margin not pubescent |
| 30 | Upper pitchers distinctly ventricose below, tubular above |
| 30' | Upper pitchers infundibuliform or ellipsoid throughout |
| 31 | Peristome rigid, somewhat woody |
| 31' | Peristome papery in texture |
| 32 | Leaf blade apex not peltate |
| 32' | Leaf blade apex peltate |
