PLATE 1. 
PLATE 2. 
PLATE 3. 
PLATE 4. 
PLATE 5. 
PLATE 6. 
PLATE 7. 
PLATE 8. 
PLATE 9g. 
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 
ILLUSTRATIONS. 
PLATES. FACING 
PAGE. 
Plant of Ferocactus wislizeni near Pima Canyon, Arizona........... 0.0. ee eee eee eee ee 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. ........ 0... eee ee eee eee etree 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. 0.0000 eee eee eee e eee e net e eens 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 
Hoydii. (5) Flowering plant of Rebutia minuscula........... 20.0... c eee eee eee ee 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 . 2... ee ee eee e eee nee eee e ete eeenenee 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. .. .. cc ee tee ene e ee te te teen eee eee een e ene 78 
(1) Plant of Lophophora williamsii. (2) Plant of Ariocarpus retusus.............0.0 ee eee eres 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............0.. 0.00.0 c eee eeee 122 
(1) Top of flowering plant of Ferocactus townsendianus. (2) Top of flowering plant of Ferocactus 
wislizeni. (3) Flower of Ferocactus diguetii.. 0.0.00. cece eee eee eeee 124 
(1) Phant of Ferocactus flavovirens. (2) Plant of Ferocactus latispinus..............20000 eee 126 
(1) Flowering plant of Ferocactus viridescens. (2) Top of flowering plant of Ferocactus rectispinus. 128 
(1 and 2) Plants of Ferocactus acanthodes... 00.00.00 ccc ccc ce eee nner ence 130 
(1) Top of flowering plant of Ferocactus hamatacanthus. (2) Flowering plant of Sclerocactus 
whipplei. (3) Top of flowering plant of Ferocactus latispinus..............0002000 08% 146 
(1) Floweiing plant of Gymnocalyciuim saglione. (2) Top of flowering plant of Gymnocalycium 
mostii. (3) Flower of same..... 0.0.0.0 ec cece cence en eeeueneeesenes 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... 0.2.0... 00. 0.00 c cc cece cece cece cece eeeeeenes 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... ccc ce cece cee ecccececnvbnbbbtnennnnenes 174 
. (1) Flowering plant of Astrophytum capricorne. 
tephracanthus..... 2.0.0. cece cece eee eceennnteteseseunnes 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 
ISlAYEMSIS.. ccc ce cece seen nee eceenceeecesetnbneeeeees 202 
‘ (2) Flowering plant of Malacocarpus ottonis. 
(3) Fruit of Sclerocactus polyancistrus. (4) Seed of same. (5) Flowering plant of 
- (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 .. 2.2... eee cece cece ee 226 
208 
