XIV 
PLATE 
FIGURE 
125. 
126 
127, 
128, 
129. 
130. 
131. 
132. 
133. 
1. 
a 
ILLUSTRATIONS. 
Facing page. 
A, Lemaireocereus thurberi (Engelm.) Britt. & Rose, Tinaja de San- 
tana. B. Lophocereus schottii (Engelm.) Britt. & Rose, San 
Francisquito. .....2...22. 2.202.202 c cee cee cece eee eeeeeeeeee 
A. Lemaireocereus gummosus (Engelm.) Britt. & Rose, Espfritu 
Santo Island. B. Lophocereus australis (K. Brandeg.) Britt. & 
Rose, Cape San Lucas....--.....2.2.0200002c cece eee ce cee ecee 
Lemaireocereus eruca (T. 8. Brandeg.) Britt. & Rose, Santo Do- 
A. Opuntia cholla Engelm., Espiritu Santo Island, B. Opuntia 
bigelovit Engelm., San Felipe Bay.............2-.2--2-0--0-0- 
A, Opuntia clavellina Engelm., San Andrés, B. Opuntia sp., 
Agua Dulce... 22... ccc eee cece cece ee eecee 
A. Pachycereus calvus (Engelm.) Britt. & Rose (young plant), San 
José del Cabo. B. Pachycereus titan (Engelin.) Britt. & Rose 
(young plant), San José del Cabo (Plants of P. calvus in back- 
ground). 2.2... eee ec c cece cece cececeee 
A. Pachycereus calvus (Engelm.) Britt, & Rose, San José del Cabo, 
B. Pachycereus pecten-aboriginum (Engelm.) Britt. & Rose, Cape 
San Lucas. ... 22.0.0... 2... cece cece ee ceee 
TEXT FIGURES. 
Map of the Sonoran Desert Region between Tucson, Arizona, and 
the Gulf of California............2....2....2.---.-..- see eeeeee 
. Leaf outline of Nymphaea microphylla...............0.0-0-000-- 
. Stigmatic pattern of Nymphaca microphylla...............-...-- 
. Map showing distribution of (a) Nymphaea microcarpa; (b) Nym- 
phaea orbiculata; (c) Nymphaea microphylla.............2-000-- 
. Leaf outline of Nymphaea rubrodisca.............2.2..-.---20-- 
. Stigmatic pattern of Nymphaea rubrodisca............2-..22224- 
- Map showing distribution of (4) Nymphaea ovata; (b) Nymphaea 
rubrodisca; (c) Nymphaea ludoviciana; (d) Nymphaea ulvacea; (e) 
Nymphaea bombycina; (f) Nymphaea sagittifolia.......-.22... 
. Leaf outline of Nymphaca americana....................2.20---- 
. Stigmatic pattern of Nymphaea americana...................-.--- 
. Map showing distribution of (2) Nymphaea puberula; (b) Nymphaea 
Sluviatilis; (c) Nymphaea americana... 2.2.2.2... eee eee ee 
. Leaf outline of Nymphaea fraterna.......... 2.20022. 2 eee eee 
. Stigmatic pattern of Nymphaca fraterna...............-.20.0005- 
- Map showing distribution of (a) Nymphaea ozarkana; (b) Nymphaea 
Jraterna; (c) Nymphaea chartacea.............--..- weet eee eee 
. Leaf outline of Nymphaea -advena.............2.2-22222 eee eee 
. Stigmatic pattern of Nymphaea advena..........-.--2-. 2.0 eee 
. Map showing distribution of (a) Nymphaca advena macro phylla; (b) 
Nymphaea advena; (c) Nymphaea polysepala; (d) Nymphaea advena 
CTYthTQed... 2.0.22 e ee eee ee eee wee eee eee eee ee eee eee eee 
. Leaf outline of Nymphaea advena macrophylla.............2..+-. 
. Leaf outline of Nymphaea ozarkana ......... 2-2-0202 eee eee eee ee 
. Leaf outline of Nymphaea ludoviciana................22-22222-- 
. Stigmatic pattern of Nymphaea ludoviciana................-..--- 
. Leaf outline of Nymphaea fluviatilis... .. 222.22... ee 
300 
