CLASSES, DIVISIONS, AND ORDERS 



BRITISH PLANTS. 



Class I. DICOTYLEDONESi. 



Stems -when perennial composed of bark, wood, and pith. 

 The wood furnished with medullary rays and increasing by the 

 addition of concentric layers externally. Leaves usually net- 

 veiued. Cotyledons 2 or more, opposite or whorled. — Each 

 floral whorl composed of 5 or 4 parts. 



Division 1. Thalamiflorje. Pet. distinct (rarely 0) and 

 as well as the stam. growing separately from the 

 sepals, hypogynous 1 



Division 2. Oalycitlou,*. Pet. distinct and, aa well as 



the stam., perigynous or epigynous 75 



Division 3. Corolllplob.^. Pet. united, at least at the 



base. Stam. mostly epipetalous 164 



Division 4. Monochlamyde^. Only a single perianth 



or none 290 



Division 5. Gymnospbrm.*). Ovules and seeds apparently 



naked. Ovary and styles wanting. Perianth wanting. .328 



Division 1. THALAMIFLOR^. 



* Apocarpoits. 



1. Ranunculacea. Stam. polyandrous (rarely pent- 

 androus). Pistils usually many, of achenes or follicles. — 

 Rarely (in Actcsa) a many -seeded berrylike carpel 1 



2. Berberidacea. Stam. 6 or 4, opposite the petals ; 

 ajith. opening by valves from the bottom 14 



' The characters are drawn to suit our plants. 



