. Carnegie Institution of Washington publication. 124 THE CACTACEAE. Key to Species—continued. Central spine straight or more or less curved, but not hooked. Central spines flexible, thin. Central spines more or less appressed; seeds very small, not angled, less than 2 mm. long Central spines more or less tortuous and spreading; seeds larger than those of F. lecontei, more than 3 mm. long Central spine dagger-like, straight, erect BB. Areoles without marginal hairs or bristles. Spines all alike Radial spines different from the central. Central spines more or less hooked. Central spine 1 Centra
. Carnegie Institution of Washington publication. 124 THE CACTACEAE. Key to Species—continued. Central spine straight or more or less curved, but not hooked. Central spines flexible, thin. Central spines more or less appressed; seeds very small, not angled, less than 2 mm. long Central spines more or less tortuous and spreading; seeds larger than those of F. lecontei, more than 3 mm. long Central spine dagger-like, straight, erect BB. Areoles without marginal hairs or bristles. Spines all alike Radial spines different from the central. Central spines more or less hooked. Central spine 1 Central spines 4 Central spines not hooked. Flowers lemon-yellow; inner perianth-segments elongated Flowers crimson; perianth-segments all short AA. Plants much smaller than the last, 6 dm. in diameter or less, sometimes, how- ever, forming large clumps. Areoles with stout spines and weak bristles Areoles with stout spines only. Spines never hooked. Spines all straight. Scales on ovary broader than linear and not with long ciliate margins. Flowers 4 to 5 cm. long, large; plant green. Plant flattened; ribs acute; margin of scales of ovary not ciliate .... Plant rounded; ribs obtuse; margin of scales of ovary ciliate Flowers 2 cm. long, small; plant glaucous Scales on ovary linear, with long ciliate margins Spines more or less curved. Flowers small, cm. long or less; ribs up to 24 Flowers larger; ribs fewer than in the last. Scales on ovary acute Scales on ovary obtuse. Central spines strongly flattened Central spines nearly terete Some of the spines hooked or recurved at the top. Central spines or one of them broad and short. Central spine solitary Central spines several. Radial spines all straight Radial spines on lower side of areoles hooked Central spines slender and elongated. Flowers large, yellow Flowers small, pinkish to brownish AAA. Species not grouped 8. F. lecontei 9. F. acanthodes 10. F. santa-maria 11. F. diguelii 12. F. covillei 13. F. peninsulat 14. F. rectispinus
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