ILLUSTRATIONS. 
Plate i. 
Plate 2. 
Plate 3. 
Plate 4. 
Plate 5. 
Plate 6. 
Plate 7. 
Plate 8. 
Plate 9. 
Plate 10. 
Plate 11. 
Plate 12. 
Plate 13. 
Plate 14. 
Plate 15. 
Plate 16. 
Plate 17. 
Plate 18. 
Plate 19. 
Plate 20. 
Plate 21. 
Plate 22. 
Plate 23. 
Plate 24. 
PLATES. 
FACING 
PAGE. 
Plant of Ferocactus wislizeni near Pima Canyon, Arizona.Frontispiece 
(1) Top of flowering plant of Echinocereus coccineus. (2) Flower of same. (3) Flowering plant 
of Echinocereus chloranthus. (4) Flowering plant of Echinocereus viridiflorus. (5) 
Flowering plant of Echinocereus maritimus. 14 
(1) Top of flowering plant of Echinocereus pentalophus. (2) Flowering plant of Echinocereus 
fitchii. (3) Top of flowering plant of Echinocereus grandis. (4) Flowering plant of 
Echinocereus blanckii. 22 
(1) Top of flowering plant of Echinocereus sciurus. (2) Flowering plant of Lobivia cinnabarina. 
(3) Flowering plant of Echinocereus fendleri. (4) Top of flowering plant of Echinocereus 
lloydii. (5) Flowering plant of Rebutia minuscula. 36 
(1) Top of flowering plant of Echinocereus engelmannii. (2) Flowering plant of Lobivia corbula. 
(3) Flowering plant of Lobivia pentlandii. (4) Flowering plant of Lobivia lateritia. 56 
(1) Top of flowering plant of Echinopsis turbinata. (2) Flowering plant of Echinopsis multiplex. 64 
(1) Top of flowering plant of Echinopsis silvestrii. (2) Top of flowering plant of Echinopsis 
leucantha. 68 
(1) Top of flowering plant of Pediocactus simpsonii. (2) Flower of Denmoza rhodacantha. (3) Flow¬ 
ering plant of Ariocarpus kotschoubeyanus. (4) Top of flowering plant of Neoporteria 
subgibbosa. 78 
(1) Plant of Lophophora williamsii. (2) Plant of Ariocarpus retusus. 84 
(1) Flowering plant of Echinopsis aurea. (2) Flowering plant of Copiapoa coquimbana. (3) 
Flowering plant of Lophophora williamsii. (4) Flowering plant of same. 86 
(1) Plant of Ferocactus pringlei. (2) Plant of Ferocactus diguetii. 122 
(1) Top of flowering plant of Ferocactus townsendianus. (2) Top of flowering plant of Ferocactus 
wislizeni. (3) Flower of Ferocactus diguetii. 124 
(1) Plant of Ferocactus flavovirens. (2) Plant of Ferocactus latispinus. 126 
(1) Flowering plant of Ferocactus viridescens. (2) Top of flowering plant of Ferocactus rectispinus. 128 
(1 and 2) Plants of Ferocactus acanthodes. 130 
(1) Top of flowering plant of Ferocactus hamatacanthus. (2) Flowering plant of Sclerocactus 
whipplei. (3) Top of flowering plant of Ferocactus latispinus. 1,46 
(1) Floweiing plant of Gymnocalycimn saglione. (2) Top of flowering plant of Gymnocalycium 
mostii. (3) Flower of same. 158 
(1) Flowering plant of Gymnocalycium megalothelos. (2) Top of flowering plant of Gymno¬ 
calycium platense. (3) Flowering plant of Gymnocalycium multiflorum. 160 
(1) Top of flowering plant of Gymnocalycium platense. (2) Top of flowering plant of Gym¬ 
nocalycium schickendantzii. (3) Top of flowering plant of Homalocephala texensis. 
(4) Fruit of same. (5) Seed of same. 164 
(1) Top of flowering plant of Malacocarpus tephracanthus. (2) Flowering plant of Malacocarpus 
ottonis. (3) Flowering plant of Echinocactus horizonthalonius. (4) Fruit of same. 
(5) Seed of same. 174 
(1) Flowering plant of Astrophytum capiicorne. (2) Top of flowering plant of Malacocarpus 
tephracanthus. 190 
(1) Top of flowering plant of Malacocarpus mammulosus. (2) Fruiting plant of Mila caespitosa. 
(3) Flowering plant of Astrophytum myriostigma. (4) Fruiting plant of Malacocarpus 
islayensis. 202 
(1) Flowering plant of Hickenia microsperma. (2) Flowering plant of Malacocarpus ottonis. 
(3) Fruit of Sclerocactus polyancistrus. (4) Seed of same. (5) Flowering plant of 
Echinofossulocactus violaciflorus. 208 
(1) Plant of Cactus lemairei. (2) Fruiting plant of Cactus harlowii. (3) Crown of same plant 
in flower and fruit. (4) Flowering plant of Discocactus bahiensis. (5) Plant of Cactus 
melocactoides. 226 
IV 
