KEY TO NATURAL ORDERS. .XI. 



Flower 2-merous; fruit mostly didymous, 



dry or drupaceous. .. Rubiaob^! 165 



Corolla irregular; stamens 1 — 3; fruit an 



aohene Valeriane.<e 167 



Flowers in dense heads; stamens 5; fruit 



an achene DipsacbjE 167 



Shrubs with alternate leaves; anthers open- 

 ing by pores Ericaceae 231 



Herbs with milky juice, campanulate or nar- 

 rower regular corolla, and many- 

 seeded capsule .-...•....-.' Campantoaoe#i 229 



* * Stamens 3 — 5, united by their anthers.' 



Corolla bilabiate; fruit capsular, many- 

 seeded ■.'....-. '.■•• Lobeliace^; 228 



Corolla ligulate; fruit an achene; plants with 



milky juice and 12-sided pollen. . . .Ciohobiaoe« 219 



Corollas ligulate or tubular; fruit an achene; 

 plants with watery or gummy juice 

 and spheroidal echinate pollen Composite 168 



Flowers unisexual; fruit fleshy, several-seeded; 

 plants trailing or climbing by 

 tendrils Cucurbitace;e 143 



Division IV. " SYMPETALiE HYPOGYNiE. 



Corolla sympetalous, at least at base, the stamens attached to its tube 

 or base, the whole inserted around .the base of the (superior) ovary. 



A. Leaves opposite or whorled; corolla regular- 



* Fruit indehiscent. 



Trees with opposite leaves : fruit a samara Oi.eace.2e 239 



Herbs with unilateral spikes or racemes; fruit 



4 nutlets Allocarya in Asperipoli/e 258 



* * Herbs with milky juice and follicular pods. 



Corolla not hooded within; anthers and 



stigma approximate Apootnace* 240 



Corolla adorned within by a whorl of hood- 

 like appendages; anthers and 

 stigma united. Asolepiadace/E 241 



.#,*.* Fruit capsular. 



Stamens opposite the corolla-lobes; placenta 



central Anagallis in Primulaoeje 238 



