Key to the Genus Coryphantha

A.1 Extrafloral nectary glands always present in the grooves and/or axils

B.1 Tubercle grooves extending only half-way to the tubercle axil

C.1 Tubercles 15-30 mm long

C.2 Tubercles 10-15 mm long

B.2 Tubercles grooved on whole length between apex and tubercle axil C.1 Cortex watery

D.1 Upper side of tubercles longer than 20 mm

E.1 Tubercles very broad (35-50 mm), broader than long E.2 Tubercles very long (25-35 mm), longer than broad F.1 Tubercles 25-28 mm long

F.2 Tubercles 30-35 mm long

D.2 Upper side of tubercles less than 12 mm long E.1 Central spines 5-7 E.2 Central spines 1-4

F.1 Radial spines up to 15 F.2 Radial spines more than 17 G.1 Body obovoid to clavate G.2 Body semiglobose to globose C.2 Cortex mucilaginous

D.1 Body columnar or cylindrical

E.1 Central spine darker than radial spines F.1 Tubercles keeled below or bulging G.1 Upper side of tubercles longer than 18 mm

I. Subgenus Neocoryphantha

I.A Section Lepidocoryphantha l.a. C. macromeris ssp.

macromeris l.b. C. macromeris ssp.

runyonii

I.B Section Robustispina

2. C. poselgeriana

3.a. C .robustispina ssp.

robustispina

3.b. C. robustispina ssp.

scheeri

I.C Section Neocoryphantha

I.C.a Series Echinoideae

4. C. wohlschlageri

5. C. vaupeliana

6. C. glanduligera

7. C. echinoidea

I.C.b Series Clavatae

8. C. octacantha

G.2 Upper side of tubercles shorter than 10 mm F.2 Tubercles conical, round

G.1 Porrect central spine straight

G.2 Porrect central spine hooked

E.2 Central and radial spines of same colour F.1 Tubercles in 5 and 8 series F.2 Tubercles in 8 and 13 or 13 and 21 series G.1 Spines uniformly yellow G.2 Spines pines dark-brown tipped

D.2 Body clavate, globose or depressed-globose E.1 Tubercles in 5 and 8 series F.1 More than 8 radial spines F.2 Less than 7 radial spines E.2 Tubercles in 8 and 13 series

A.2 Extrafloral nectary glands lacking or optionally present exclusively close to the spiniferous (abaxial) part of the areole

B.1 Tubercles at the base more than 7 mm wide, seeds reniform

C.1 Majority of radial spines subulate or thin subulate D.1 Radial spines less than 10, majority subulate E.1 Plants solitary

E.2 Usually group-forming

F.1 Tubercles 25-27 mm wide

F.2 Tubercles 18-22 mm wide

D.2 Radial spines more than 10, majority thin subulate C.2 Majority of radial spines needle-like

D.1 Central spines always present, none porrect, all appressed to the body E.1 5-7 central spines E.2 Always 3 central spines D.2 Central spines, if present, at least one dominating porrect

E.1 Tubercles appressed, flat conical or bulging

F.1 Two types of radial spines (subulate and needle-like)

G.1 Tubercles conical-cylindrical, rounded H.1 Always 5-8 central spines H.2 Maximum 4 central spines G.2 Tubercles flattened, broadly conical

9. C. jalpanensis

10.a. C. clavata ssp. clavata

10.b. C. clavata ssp. stipi-tata

11. C.glassii

13. C. potosiana

I.D Section Ottonis

14. C. ottonis

15. C. vogtherriana

16. C. georgii

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