VI 
CONTENTS: 
No. 
3. 
DESCRIPTION OF THE CACTACEA. 
BY GEORGE ENGELMANN, M.D., OF ST. LOUIS, AND J. M. BIGELOW, M.D. 
Mamillaria, Haw. 
Echinocactus, Link. 
Cereus, Haw-e 
Opuntia, Tourn. 
EXPLANATIONS OF THE PLATES OF THE CACTACEA. 
DESCRIPTIONS OF THE GENERAL BOTANICAL COLLECTIONS. 
¥F 
Cruciferz. 
BY JOHN TORREY. 
cee. 
Calycanthacez. - 
Lythracez. 
Onagracea. 
Gross 2. 
Cucurbitacee. 
Compositx, (by A. Gray.) 
Aphantocheta, Nov. Gen. 
Pugiapappus, Nov. G 
Syntrichopappus, sew: ‘eee 
Lobeliacez. 
ee ay ; 
painerarrpeart (by A. Gray.) 
baginacex. 
Primulacez. 
Orobanchacez, (by A. Gray.) 
nee eee 
