4 KEY TO THE ORDERS 



Flowers monoecious or dioecious or with only one stamen. 



MALVALES: 89. 

 Trees or vines. 



Ovary 1-celled, fruits, if samaras, winged all around. 



MALVALES: 89. 

 Ovary 1-celled, fruits samaras with terminal wings. 

 Samaras single, oar-shaped. Fraxinus: 106. 



Samaras in pairs. Aceraceae: 154. 



Ovary inferior. 



Aquatics with whorled leaves. MYRTALES: 143. 



Terrestrial plants, or if aquatic, leaves not whorled. 

 Corolla wanting. 

 Trees. SAPINDALES: 154. 



Herbs. Comandra: 153. 



Corolla present. 

 Petals distinct. 



Stamens numerous, more than twice as many as the petals. 

 Stems fleshy, usually very spiny, leaves small or wanting. 



CACTALES: 149. 

 Stems normal with normal leaves. Loasaceae: 149. 



Stamens not more than twice as many as the petals. 



Fruit a pyxis. Poptulacaceae: 69. 



Fruits various but not a pyxis. 



Ovules 2 or more in each cavity of the ovary. 



Vines with tendrils. Cucurbutaceae: 150. 



Herbs, shrubs, or trees, not tendril bearins; 



Fruit a berry or a fleshy pome. ROSALES: 122. 



Fruit a capsule or nut-like, petals mostly 4. 



MYRTALES: 143. 

 Ovules solitary in each cavity. UMBELLALES: 158. 



Petals more or less united. 



Filaments free from the corolla. CAMPANULALES: 166. 



Filaments adnate to the corolla. 

 Ovary with 2 or more ovules. 



Vines with tendrils. Cucurbitaceae: 150. 



Plants without tendrils. RUB! ALES: 163. 



Ovary with a single ovule. CAMPANULALES: 166. 



