CONTENTS. 
Page. 
The genus Cereus and its allies in North America. By N. L. Britton and 
J. N. Rose... 2.2.22 eee eee ee eee ee ee eee eee enone 413 
Introduction ........------------0 eee cee ee eee eee ee teen eee eee 413 
Descriptions of genera with lists of species.....--------------------+---- 414 
Species of unknown generic relationship. .-.---.------------------------ 435 
Five new species of Crassulaceae from Mexico. By J. N. Rose....---------- 439 
Supplement to the monograph of the North American Umbelliferae. By John 
M. Coulter and J. N. Rose ......---.---------+-- +--+ 2-2-2 eee eee ee eee ee 441 
Introduction .........-...------------ eee eee ener 441 
Bibliography...-.-.-.------------------- 2-2-2 eee ee eee cette 441 
Genera and species .............---------------- (eee ee eee eee eee eeeee 442 
Apogamy in the maize plant. By G. N. Collins.......--.---------------+-- 453 
Puate LXI. 
LXII. 
LNIII. 
LXIV. 
LXV. 
LXVL. 
LXVII. 
LXVIII. 
LXIX. 
LXX. 
LXXI. 
LXXIT. 
LX XIII. 
LXXIV. 
LXXV. 
LXXVI. 
LXXVII. 
LXXVIII. 
LXXIX. 
LXXX. 
LXXXI. 
LX XXII. 
LXXNIII. 
LXXXIV. 
LXXXV. 
ILLUSTRATIONS. 
Facing page. 
Cereus jamacaru (L.) Mill .........----------+-------------+--- 414 
Cephalocereus colombianus Rose ......-.------------------+0+-+- 416 
Cephalocereus colombianus Rose ......----------------------++- 416 
Cephalocereus maxonti Rose .......---------------------++++-+- 417 
Escontria chiotilla (Weber) Rose ......-.---------------------- 420 
Pachycereus chrysomallus (Lem.) Britton & Rose......-.-------- 421 
Lemaireocereus griseus (Haw.) Britton & Rose ....-------------- 425 
Lemaireocereus mixtecensis (Purpus) Britton & Rose ...-.--.----. 425 
Lemaireocereus stellatus (Pfeiff.) Britton & Rose.......---------- 426 
Lemaireocereus treleasei Rose.....--------------------------+--- 426 
Lemaireocereus weberi (Coult.) Britton & Rose ..-..-------.----- 426 
Myrtillocactus geometrizans (Mart. ) Console........------------- 427 
Myrtillocactus schenckii (Purpus) Britton & Rose .-.--.---------- 427 
Peniocereus greggit (Engelm.) Britton & Rose .....------------- 428 
Peniocereus greggit (Engelm.) Britton & Rose ...-...--.-.------ 428 
Selenicereus macdonaldiae (Hook.) Britton & Rose ....-....-..f. 480 
Echeveria bifurcata Rose ....---------------------------+----+- 439 
Echeveria trianthina Rose ....-----.--. ----- - wee 439 
Sedum allantoides Rose......-.---------. --------+--+ +--+ +--+ 440 
Sedum compressum Rose. ...-..-------------+-- <0 0202 ee eee trees 440 
Villadia levis Rose....-.---.---------------- + eee eee eee eres 440 
Ligusticella eastwoodae C. & R ....---------- 0 +--+ +--+ 2-22 r eee 445 
Pseudocymopterus tidestromii C. & BR. ..-.--------- +--+ +22 2-22 -+ +e 447 
Young plants and spikelets of apogamous maize. ....--.-.------ 454 
Branch of tassel of apogamous maize ....---------------------- 454 
