JUN 2 1 1905 
The Ohio ^JS[^atiiralist, 
PUBLISHED BY 
The Biological Club of the Ohio State Unmersity. 
Volume V. JUNE, 1905. No. 8. 
TABLE OF CONTENTS 
Riddle — Pevelopment of ihe Embryo Sac and Embryo of Batrachium loiigirostris . 353 
SciiAFFNEK— Key to the Genera of Ohio Woody Plants Based on Leaf and Twig 
Characters 364 
Osborn — Descriptions of Now North American Fnlgoridae 373 
Surface— Meeting of tlio Biological Club 377 
DEVELOPMENT OF THE EMBRYO SAC AND EMBRYO OF 
BATRACHIUM LONGIROSTRIS.* 
Lumina Cotton Riddle. 
Batrachium longirostris (Godr.) F. Schultz is one of the white 
water Ranunculaceae. By many authorities it is included in the 
genus Ranunculus but Britton in his Manual separates them into 
two genera on the character of the achene, that of Batrachium 
being transversely wrinkled. He distinguishes B. longirostris 
from B. divaricatum and B. trichophyllum with which the first 
is often confused, by the length of the beak of the achene. Prantl 
in his classification of the Ranunculaceae in the “Pfianzen- 
familien” includes Batrachium in the Genus Ranunculus but 
divides the genus into seven sub-genera placing Batrachium in 
the third, Marsypadenium. This sub-genus he further divides 
into five super-species of which the first is Batrachium and the 
second Xanthobatrachium. Under this he places Ranunculus 
delphinifolius Torr. (R. multifidus Pursh) making the following 
distinctions; 
Batrachium, Honigbl. weisze, Nektarium in einer Grube; Fr. 
runzelig. 
Xanthobatrachium, Honigbl. gelb, Xektarium oefters mit 
seitlichen happen; Fr. nicht runzelig. 
The writer had the privilege of studying three dozen excel- 
lenth^ prepared and carefully selected slides of Ranunculus 
delphinifolius and some close resemblances were noted to 
Batrachium longirostris which will be referred to later in the 
discussion. 
* Contributions from the Botanical Laboratory of the Ohio State 
University, XX. 
