Key to Species
A. Tube of perianth distinctly longer than limb.
B. Flowers white to red or pinkish.
C. Spines all straight, subulate.
Inner perianth-segments thread-like
Inner perianth-segments broad.
Stems slender, cylindric, much longer than thick
Fruit very slender
Fruit (so far as known) globular
Flowers 10 cm. long
Flowers 17 to 20 cm. long.
Central spines 1 to 4, 4 cm. long
1. E. meyeri
2. E. mirabilis
3. E. forbesii
4. E. huottii
5. E. minuana
*In Echinopsis aurea and E. formosa the flowers are yellow, in E. multiplex and E. oxygona red to rose.
Continue reading here: Key to Speciescontinued
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