X. KEY TO NATURAL ORDERS. 



* * Stamens 5 or 10 only. 



Corolla papilionaceous; fruit a legume'. ...'....'. Leguminos« 83 



Corolla regular or nearly so; 



Calyx tubular; petals on its throat Salicarle 140 



Calyx oampanulate; petals near the base-. . . Saxifrages 119 



B. Ovary mainly inferior. 



* Stamens many, usually 20 or more. 



Woody plants; carpels 2—5; fruit a pome Pomaces 110 



Succulent herbs; carpels several; fruit fleshy 



or capsular Ficoides 128 



Herbs rough with short barbed hairs; ovary 



cylindric, wholly inferior Loases 141 



Flowers apetalous, dicecious Datisces 28 



* * Stamens few and definite. 



Calyx-limb obvious; flowers mostly 4-merous; 

 Fruit dry and capsular, or nut-like, or 



baccate EpiiiOBIaces 129 



Fruit fleshy and drupaceous Corner 159 



Calyx-limb surpassing the tube; flowers 5-mer- 



ous; fruit baccate Ribes in Saxifrages 123 



Calyx-limb 3-lobed; stamens 6—12 Aristolochiaces 142 



Calyx-limb 5-tootlied or obsolete; 



Stamens syngenecious ".*,.' Cuctjbbitace* 143 



Stamens distinct; 



Ovary more than 2-celled; fruit baccate AraliacejE 145 



Ovary 2 celled; fruit a pair of ribbed 



or winged or striata carpels Umbellifers 145 



Apetalous aquatics; fruits nutlets Halorages 138 



Division III. SYMPETAL.E PERIGYN^E. 



Sepals united below into a tube adherent to the ovary. United corolla, 

 with adherent stamens, inserted on the calyx near its summit. • 



* Stamens 1 — 10, distinct. 



Parasites with jointed stems, no petals, and a 



berry-like fruit Loranthes 161 



Leafy terrestrial plants, with opposite or 

 whorled leaves, and small calyx- 

 limb; 

 Flowers 5-merous; fruit berry-like Caprifoliaces 162 



