30 COHESION. 
Further details relating to cohesion of the various parts of the flower 
are cited in Moquin-Tandon, ‘ El. Ter. Veg.,’ p. 248; ‘ Weber. Verhandl. 
Nat. Hist. Verems f. d. Preuss. Rhein]. und Westphal., > 1860, p. 332, 
tabs. 6 et 7. 
Formation of ascidia or pitchers—In the preceding para- 
graphs, the formation of tubular or horn-hke structures, 
from the union of the margins of one organ, or from 
the coalescence, or it may be from the want of separa- 
tion of various organs, has been alluded to, so that it 
seems only necessary now, by way of summary, to 
mention the classification of ascidia proposed by Pro- 
fessor Charles Morren,' who divides the structures in 
question into two heads, according as they are formed 
from one or more leaves. The following list is arranged 
according to the views of the Belgian savant, and com- 
prises a few additional illustrations. Those to which 
the ! is affixed have been seen by the writer himself; 
the * indicates the more frequent occurrence of the 
phenomenon in some than in other plants. Those 
plants, such as Nepenthes, &c., which occur normally 
and constantly, are not here ceeds Possibly some 
of the cases would be more properly classed under 
dilatation or excayation. 
ASCIDIA. 
A. Monophyllous. 
1. Sarracenia-like pitchers, formed by a single leaf, the edgesvof which 
are united for the greater portion of their length, but are disunited near 
the top, so as to leave an oblique aperture. 
*Brassica oleracea (several of the cultivated varieties) ! 
*Tiha europea ! 
Pelargonium inquinans ! 
Staphylea pinnata. 
Amorpha fruticosa. 
Pisum sativum! 
Lathyrus tuberosus. 
Vicia sp. 
Gleditschia sp. 
Ceratonia siliqua. 
Trifolium repens ! 
Cassia marylamdica. 

' «Bull. Acad. Roy. Bruxelles,’ 1838, t. v, p. 582. ‘ Bull. Acad. Roy. 
Belg.,’ 1852, t. xix, part ili, p. 437. 
