Number VI (June 19, 1939) 
The correct Names of certain Economic Plants 
By Albert F. Hill.89 
Nomenclatorial Notes. X 
By Charles Schweinfurth.112 
Number VII (June 27, 1939) 
The Nomenclature of the Taro and its Varieties 
By Albert F. Hill.113 
Plantae mexicanae III: A significant Variety of Lip- 
aris vexillifera from Oaxaca 
By Richard Evans Schultes.123 
Number VIII (June 30, 1939) 
The fossil Flora of Iowa Coal Balls: I. Discovery and 
Occurrence 
By William C. Darrah.125 
Number IX (August 8, 1939) 
Orchid Studies, X: Orchids from America and Asia 
By Louis O. Williams .137 
Notes on a remarkable Collection of Orchids from 
Panama 
By Charles Schweinfurth. 149 
Number X (September 6, 1939) 
The fossil Flora of Iowa Coal Balls: II. The Fructi¬ 
fication of Botryopteris 
By William C. Darrah.157 
Book Review 
By Louis O. Williams. 181 
[vi] 
