Spines all weak, often thread-like 1. N. nidus
Spines stouter, the central, at least, subulate. Spines black.
Spines puberulent; outer perianth-segments reddish 2. N. occulta
Spines glabrous; outer perianth-segments greenish 3. N. nigricans
Spines not black (or black when young in No. 7). Flowers pink.
Plants bluish green; style and stigma-lobes reddish 4. N. jussieui
Plants bright green; style and stigma-lobes white to greenish.
Perianth-segments entire 5. N. subgibbosa
Perianth-segments toothed 6. N. chilensis
Flowers not pink 7. N. fusca.
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