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1. Limb with long cilia at margin C. ciliata — Limb without cilia at margin 2 2. Leaf blade ± covered with hairs on abaxial surface and/or along margin 3 — Leaf blade glabrous 5 3. Leaf blade lanceolate, ± bullate; spathe 5–7 cm long, very narrow, kettle white inside C. uenoi — Leaf blade ovate to shortly lanceolate, not significantly bullate; spathe 7-10(-12) cm long, broad, kettle ± purplish inside, often inflated 4 4. Limb abruptly narrowed into a tail, collar pronounced C. ferruginea var. ferruginea — Limb gradually tapering into a tail, collar zone present C. fusca 5. Tube of spathe > 2× as long as limb 6 — Tube of spathe ≤ 2× as long as limb 15 6. Limb with reddish or purplish protuberances 7 — Limb ± smooth, yellow, brown or purple 9 7. Limb c. 1 cm wide, with black-purple, coarse protuberances on a white base, collar purple C. zaidiana — Limb c. 0.5 cm wide, with fine protuberances, collar not purple 8 8. Limb ± recurved, with red protuberances, especially on margin, collar yellow with red spots; leaf blade ovate, occasionally slightly bullate C. pallidinervia — Limb ± spirally recurved, with yellow to purple protuberances over whole surface, collar zone present; leaf blade lanceolate, bullate C. keei 9. Limb 0.5–1 cm wide, with a rather long, ± twisted apex 10 — Limb usually more than 1 cm wide, without a long tail or apex 11 10. Leaf blade 3–12 cm long, usually flat C. striolata — Leaf blade 10–30 cm long, noticeably bullate C. hudoroi 11. Limb yellow to brownish, collar zone yellow 12 — Limb brownish to purple, collar zone purple or purple spotted 13 12. Limb 1–2 cm wide, tube 5-10(-15) cm long; leaf-margin plain C. cordata var. grabowskii — Limb c. 0.5 cm wide, tube 4–6 cm long; leaf with a distinct, membranous, ciliate margin C. aura 13. Limb brownish purple, collar zone yellow-purple spotted C. × purpurea nothovar. borneoensis ----- (incl. C. edithiae) — Limb purple, collar zone plain purple 14 14. Limb almost smooth, shiny purple, collar zone almost as wide as limb C. × batangkayanensis — Limb rough or with protuberances, dull purple, collar zone c. ½ as wide as limb C. × purpurea nothovar. borneoensis 15. Limb white to silvery, occasionally pinkish, collar white or purple 16 — Limb purple or brownish to yellowish 19 16. Limb (collar zone) white, with a long, thin, purple tail C. erwinii — Limb wholly white, silvery or pinkish, short or long, collar white or purple 17 17. Limb > 3 cm long, upright, white, surface with protuberances, collar purple 18 — Limb ≤ 3 cm long, if longer not upright, collar whitish C. regina 18. Leaves 5–8 together, blade 3-7 × 6-10 cm; spathe 15-20 cm long C. yujii var. yujii — Leaves > 10, often > 25 together, blade 2-4 × 6-7 cm; spathe 7–10 cm long C. yujii var. hendrikii 19. Limb taper-pointed or with a long tail 20 — Limb neither taper-pointed nor with a tail 26 20. Leaves light green, blade vertically oriented, spongy, veins inconspicuous; distal part of limb red-purple, collar zone yellow, spotted red C. lingua — Leaves various shades of purplish, blade ± horizontally oriented 21 21. Limb at base usually open circular in view, with a distinct collar, tail 10–15 cm long C. longicauda — Limb at base not open circular in view, with or without a distinct collar, tail ≤ 10 cm long 22 22. Limb purple or yellowish, with ± rough protuberances 23 — Limb purple to dark purple, ± smooth 25 23. Limb with a long, filiform tail, kettle inflated C. ferruginea var. sekadauensis — Limb with a long, but not filiform tail, kettle not inflated 24 24. Limb yellow(ish), throat purphsh spotted C. keei — Limb purple, throat purple C. uenoi 25. Limb ± upright backward coiled, throat open C. striolata — Limb forward obliquely twisted, throat hidden C. ideii 26. Leaf blade conspicuously bullate C. bullosa — Leaf blade not conspicuously bullate 27 27. Limb upright or recurved, collar narrow, conspicuous 28 — Limb ± forward obliquely twisted, if ± upright then collar zone broad 29 28. Limb strongly recurved, with many distinctly regular, round protuberances, collar thick in view, ± horizontal in circular opening C. griffithii — Limb upright, not recurved to any extent, protuberances rather small and ± distinct, collar thin, vertical, funnel-shaped C. sahalii 29. Limb brown, spotted C. noritoi — Limb light to dark purple 30 30. Throat whitish silvery to pinkish C. regina — Throat dark purple 31 31. Limb 1–1.5 cm long; leaves 5–15 cm long, blade not spongy, ± horizontally oriented C. bastmeijeri — Limb to 3 or 3–5 cm long; leaves 5–20 or 20–25 (-30) cm long, ± spongy, vertically or horizontally oriented 32 32. Limb to 3 cm long; leaves 20-25 (-30) cm long, ± vertically oriented, green C. isae — Limb 3–5 cm long; leaves 5–-20 cm long, ± horizontally oriented, green or with silvery purplish markings C. auriculata