Stems more or less branched, usually erect.
Limb of flower broad.
Joints relatively slender, 5 to 9 cm. thick.
Ribs transversely sulcate between the areoles.
Tubercles prominent 1. T. thelegonus
Tubercles not prominent 2. T. thelegonoides
Ribs not transversely sulcate between the areoles.
Central spine solitary 3. T. spachianus
Central spines 4 4. T. lamprochlorus
Ribs on old plants very numerous and the spines bristle-like 5. T. pasacana
Spines yellow, at least when young; ribs 4 to 8 6. T. bridgesii
Spines brown from the first; ribs 6 to 8.
Plant dark green; spines few at each areole or wanting 7. T. pachanoi
Plant light green; spines several at each areole.
Spines acicular, 2.5 cm. long or less 8. T. macrogonus
Spines subulate, up to 7 cm. long.
Spines swollen at base; young growth green 9. T. cuzcoensis
Spines not swollen at base; young growth very glaucous 10. T. peruvianus
Ribs 16 or 17 11. T. chiloensis
Spines very stout, formidable.
Spines dark brown 12. T. coquimbanus
Spines yellow 13. T. terscheckii
Limb of flower narrow 14. T. fascicularis
Stems usually simple, low, cespitose.
Flowers red or yellow, short, more or less campanulate 15. T. huascha
Flowers elongated, funnelform, white. Tube longer than the limb.
Ribs few, 9 to 11 16. T. candicans
Ribs 12 to 18.
Stem slender, elongated 17. T. strigosus
Stem stout, short 18. T. shaferi
Tube about the length of the limb 19. T. schickendantzii
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