GENERA OF CLASS XII. ICOSANDRIA. 83 



Stinguish the flowers from those of the next class, with which 

 they might otherwise be confounded. The orders are five, viz. 



Order 1. Monogynia, comprehends such plants as have but 

 one style. This order contains twenty -one genera, which fall un- 

 der two sections, 1. Calyx superior, containing thirteen genera* 

 Viz. Cactus {melon thistle) ... Eugenia. ..PhiladeLphus {syringa) 

 ...Psidium {guava) Myrtus {myrtle) ..*Punica {pomegranate') 

 ♦ ..Leptospermum... Fabricia... Metrosideros... Robinsonia... 

 Calyptranthes... Eucalyptus. ..and Foztidia. 2. Calyx inferior, 

 including eight genera, viz. Sonneratia ... Amygdalus {almond, 

 peach, nectarine)... Prvxus {plum, cherry, apricot, laurel)... Chry- 

 sobalan us {cocoa plu?n). ..Vlinia. ..Banara... Antherylium... and 



SCOLOPIA. 



Order 2. Digynia, comprehending such plants as have two 

 styles. Of this order there are tivo genera, viz. Crataegus {haw- 

 thorn) . . . Waldsteinia . 



Order 3. Trigynia, comprehending such plants as have three 

 styles. This order contains two genera, viz. Sorbus {service) 

 ...and Sesuvium. 



Order 4. Pentagynia, comprehending such plants as havejfo* 

 styles. This order contains six genera, viz. Mespilus {medlar) 

 ...Pyrus {pear, apple, quince)... Tetragon ia...MesembrYanthe- 

 mum {fig marygold)...AriooN...2Lud Spiraea. 



Order 5. Polygynia, comprehending such plants as have many 

 styles. This order contains nine genera, viz. Rosa (rase)...Ru- 

 Bus {bramble raspberry) ... Frag aria {strawberry) ...Potentilla 

 (cint/uefoil) ...Tormentilla {septfoil) ... Geum {avens) ...Bryas 

 {mountain avens) ...Comarum {marsh cinquej oil J. ..and Calycan- 

 thus {allspice). 



G8 



