LAWS OP NOMENCLATURE. 23 



§ 2. Namea of Cohorts and Subcohorts. 



Art. 20. Cohorts are designated preferably by the 

 name of one of their principal Orders, and as far as 

 possible with a uniform termination. 



Subcohorts (rarely used) may be designated in the 

 same manner. 



§ 3. Names of Orders and Suborders, of Tribes and Subtribes. 



Art. 21. Orders {Or dines, Familice) are designated 

 by the name of one of their genera, with the final 

 acece {Rosacea, from Rosa ; Ranunculacece, from Ra- 

 nunculus, etc.). 



Art. 22. Custom warrants the following excep- 

 tions : — 



(1.) When the Latin name of the genus from which 

 is taken that of the Order ends in -ix or -is (genitive 

 -ids or -idis\ the termination -iceoe, or -ineoe, or -ideoe is 

 admitted (^Balicinece, from Salix ; Tamariscinem, from 

 Tamarix ; Berheridece, from Berheris). 



(2.) When the genus from which the name is derived 

 has an unusually long name, no tribe in the Order 

 taking its appellation after the same genus, the termi- 

 nation in -ece is admitted {Dipterocarpece, from Dipte- 

 rocarpus). 



(3.) Some large Orders, named long since, have re- 

 tained the exceptional names under which they are 

 generally known {CrucifercB, Leguminosce, Guttifera, 

 UmbellifercB, CompositcB, LaBiatcB, Cupuliferce, Coniferce, 

 Pahnea, Graminece, etc.). 



(4.) An old generic name, which has become that of 

 a section or of a species, may be preserved as the foun- 

 dation of that of the Order {LentibulariecB, from Len- 

 tihularia ; Sippocastanece, from Msculus Hippocasta- 

 num ; Caryophyllece, from Dianthus Caryophyllus, etc.). 



