20 



KEY TO XATUEAL OK£>EES. 



DivTSio:^ II. MoxoPETALOUS : Calyx 3J^di corolla both present ; the petals 

 more or less united. 



A. Tube of the calyx coherext with the oyaey, the corolla ap- 

 farenily inmied on the ovary. 



Stamens united by their anthers, and 



Not by their filaments. Flowers in heads p^ge, 

 which are furnished with an involucre. Composite 168 

 Also more or less by their filaments. Flowers 

 not in heads. 



Corolla hregular, cleft down one side. 



Flowers perfect. Lobeliace^ 206 



Corolla regular. Flowers monoecious. 

 Tendril bearing vines. Cucurbitace^ 1-38 



Stamens separated f/om each other, and 



Inserted on the corolla. Leaves opposite or 

 whorled. 



Leaves opposite, without stiiDules. 



Flowers in an involucrate head. DffSACE^, 167 

 Flowers not involucrate. 



Stamens 2 -3. CoroUa 5-lobed. Yaleriaxac^le, 165 

 Stamens 4-5. CoroUa 4-5- 



lobed. Caprifoliaoe^, 160 



Leaves opposite with stipules between 

 them, or whorled without stipules. Eublice^ 163 

 Inserted with but not on the corolla. 



Stamens twice as many as the lobes of 



the corolla. 

 "Woody plants. Huckleberry sub-family 



[in Ericace^, 207 

 B. Calyx free from the ovary ; the corolla on the receptacle. 

 1. Stamens more in Jiumher than the lobes of the corolla. 

 Leaves compound. Flowers commonly irregular. 



Pod 1-ceUed. LEGLUixosiE, 93 



Leaves simple or palmately divided. Stamens 



united into a tube. IEalvace.e, 63 



Leaves simple, undivided. Stamens united only 

 at the base, or separate. 



Stamens on the coroUa, twice or fou' times as 



many as its lobes. Ebexacr^:, 217 



Stamens free from the corolla, twice as many 



as its lobes. Ericace^, 207 



2. Stamens as many as the 5, 4 or rarely 6-7 lobes of the reyular corolla. 



Stamens alternate with the lobes of the corolla, 5 

 or rarely 4. 



Inserted on the receptacle. Ericace^, 207 



Inserted on the coroUa, but connected more 

 or less with the stigma. Juice milk}-. 



FUaments monadelphous. " Asglepiadace^, 261 



