174 



CLASS 21. MONOECIA. 



(Plants having some of their flowers with Stamens only, and 

 others flowers with Pointals only.) 



It was observed that the twelfth class contained most of our 

 fruit trees to this belong most of our timber trees, as the 

 Alder Tree, the Box Tree, the Oak, the Beech, the Birch, the 

 Chesnut, the Hornbeam, the Hazel, and the Pine or Fir. 

 Here also are the Stinging Nettle, the White Briony, the 

 numerous and difficult family of the Sedges, besides some 

 curious water plants, as the Common Water Starwort, the 

 Horned Pondweed, the Grass-wrack, the Pipewort, the Horn- 

 wort, and the Water Milfoile. 



Order 1. MONANDRIA. 1 Stamen. 



SPURGE, (Euphorbia.) Calyx holding several flowers of one 

 stamen each; and one pointal, with a three-cleft style. 



Order 3. TRIANDRIA. 3 Stamens. 



REED-MACE, BULL-RUSH, (Typha.) Flowers collected into 



close round spikes. 

 BUR-REED, (Sparganium.) Flowers collected into round heads. 



Order 7. POLYANDRIA. Many Stamens. 



ARROW-HEAD, (Sagittaria.) Calyx three-leaved ; petals three ; 



pointals numerous. 

 CUCKOO-PINT, (Arum.) Calyx a sheath of one leaf; flowers 



on a spike. 

 SALAD-BURNET, (Poterium.) Flowers collected into heads ; 



calyx four cleft. 



