/. 



The Ohio V\[^aturalist, 



PUBLISHED BY 



The Biological Club of the Ohio Stale Uni'versity, 

 Volume V. JUNE, 1905. No. 8. 



TABLE OF CONTENTS 



Riddle— Development of \he Embryo Sac aiul Embryo of Batraeliium longiiostris . 353 



SCHAFFNER— Key to the Genera of Ohio Woody Plants Based ou Leaf and Twig 



Characters 364 



OsBGEN— Descriptions of New North American Fiilgoridae 373 



Surface— Meeting of the 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 "Pflanzen- 

 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, Nektarium oefters mit 

 seitlichen Lappen; Fr. nicht runzelig. 



The writer had the privilege of studying three dozen excel- 

 lently 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. 



ujIlIBRAR Y 



* Contribtitions from the Botanical Laboratory of the Ohio State 

 University, XX. 



