120 



DICOTYLEDONES. 



Subclass I. Choripetalae. 



Perianth absent or single or double; if double the 

 members of the inner whorl free. Fam. i 106. 



Subclass II. Sympetalae. 



Perianth double, the members of the inner whorl 

 more or less connate. Fam. 107- 14.1. 



CHORIPETALAE. 

 Scries I. Monochlamydeae \ Fam. I — 23. 

 A. Perianth none. 



Order I. Pipe rales. 



Perianth none (S. A.). Flowers hermaphrodite or 



unisexual. Stamens 1--10. Ovary sessile, solitary, 1- 

 celled, i-ovuled. 



Flowers very small, spicate ; leaves entire, with or 



without stipules. Fam. 1. 



Order II. Salic ales. 



Perianth none. Flowers dioecious, with a cup- 

 shaped or scale-like disc. Stamens 2 or more, inserted 

 on a torus. Carpels 2, connate. Ovary 1 -celled ; ovules 



* The Monochlamydeae are not a sharply circumscribed natural group, the term, 

 which means "bearing one floral envelope," merely indicating a simpler stage of develop- 

 ment than that which is represented bj the Dialypetalae and the Sympetalae. |ust 

 as these subclasses include some reduced forms, which have only one perianth, as 

 e.g. Clematis in Ranunculaceae, Cliffortia and its allies in Rosaceae, Euphorbia in 

 Geraniales and several entire families of the Myrtiflorae, as the Penaeaceac anil their allies, 

 so, on the other hand, we find a double perianth in some families of the Monochlamydcac, 

 viz. Portu/aca, Si/eue, Dianthui and a tew others. There is no universal line of demarcation 

 in this respect. 



See also WetTSTEIN, Handb., Second edition, p. 4H9. 



