Key To Species

A. Base of flower-tube naked within. B. Ribs 20 to 50 or more.

Plant somewhat depressed; spines not long 1. L. bruchii

Plant globose to cylindric; spines very long.

Tubercles very large, 2 to 3 cm. long, 1 to 1.5 cm. high; central spines upwardly c ur ve d 2. L. ferox

Tubercles 1 to 2 cm. long or less, not over 1 cm. high; Spines slender, nearly straight.

Tubercles narrow, acute; spines subulate 3. L. longispina

Tubercles broad, blunt; spines acicular 4. L. boliviensis

BB. Ribs up to 1, but usually fewer

Flowers yellow 5. L. shaferi

Flowers reddish.

Scales on flower-tube few.

Spines curved or somewhat hooked.

Central spines 4, some hooked; radial spines weak, 4 to mm. long, yellowish 6. L. cachensis

Central spine solitary, never hooked; radial spines 1 to 2 cm. long, brownish 7. L. caespitosa

Spines straight 8. L. saltensis

Scales on flower-tube numerous.

Ribs strongly undulate or broken into narrow tubercles. Inner perianth-segments broad.

Flower-areoles short-hairy; tubercles long, acute.

Spines grayish, short 9. L. cinnabarina

Spines yellowish brown, elongated 10. L. pentlandii

Flower-areoles long-hairy; tubercles short, blunt 11. L. lateritia

Inner perianth-segments narrow.

Flowers 5.5 to 6 cm. long, white-hairy 12. L. pampana

Flowers small, 3 cm. long, black-hairy 13. L. corbula

Ribs not strongly undulate, at least never tubercled. F l ower s 6 cm. long o r less.

Central spine 1 to 2.5 cm. long 14. L. andalgalensis

Central spines up to 5 cm. long, 15. L. haematantha

Flowers 10 cm. long 16. L. grandiflora

AA. Base of flower-tube with ring of hairs on inside; scales on outside of flower reflexed at apex.

Flowers yellow 17. L. thionanthus

Flowers white 18. L. chionanthus

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