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. Portulacaceae: 69. 
Fruits various but not a pyxis. 
Ovules 2 or more in each cavity of the ovary. 
Vines with tendrils. Cucurbitaceae: 150. 
Herbs, shrubs, or trees, not tendril bearing 
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. *  RUBIALES: 163. 
Ovary with a single ovule. CAMPANULALES: 166. 
